mirror of
https://github.com/AsahiLinux/u-boot
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ec1add1e51
A recent change to unify the flattree/livetree code introduced a small
size increase in SPL on some boards. For example SPL code size for
px30-core-ctouch2-px30 increased by 40 bytes.
To address this we can take advantage of the fact that some of the ofnode
functions are only called a few times in SPL, so it is worth inlining
them.
Add new Kconfig options to control this. These functions are not inlined
for U-Boot proper, since this increases code size.
Fixes: 2ebea5eaeb ("dm: core: Combine the flattree and livetree binding code")
Signed-off-by: Simon Glass <sjg@chromium.org>
1055 lines
32 KiB
C
1055 lines
32 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef _DM_OFNODE_H
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#define _DM_OFNODE_H
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/* TODO(sjg@chromium.org): Drop fdtdec.h include */
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#include <fdtdec.h>
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#include <dm/of.h>
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#include <dm/of_access.h>
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#include <log.h>
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/* Enable checks to protect against invalid calls */
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#undef OF_CHECKS
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struct resource;
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/**
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* ofnode - reference to a device tree node
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*
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* This union can hold either a straightforward pointer to a struct device_node
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* in the live device tree, or an offset within the flat device tree. In the
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* latter case, the pointer value is just the integer offset within the flat DT.
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*
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* Thus we can reference nodes in both the live tree (once available) and the
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* flat tree (until then). Functions are available to translate between an
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* ofnode and either an offset or a struct device_node *.
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*
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* The reference can also hold a null offset, in which case the pointer value
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* here is NULL. This corresponds to a struct device_node * value of
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* NULL, or an offset of -1.
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*
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* There is no ambiguity as to whether ofnode holds an offset or a node
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* pointer: when the live tree is active it holds a node pointer, otherwise it
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* holds an offset. The value itself does not need to be unique and in theory
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* the same value could point to a valid device node or a valid offset. We
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* could arrange for a unique value to be used (e.g. by making the pointer
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* point to an offset within the flat device tree in the case of an offset) but
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* this increases code size slightly due to the subtraction. Since it offers no
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* real benefit, the approach described here seems best.
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*
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* For now these points use constant types, since we don't allow writing
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* the DT.
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*
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* @np: Pointer to device node, used for live tree
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* @of_offset: Pointer into flat device tree, used for flat tree. Note that this
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* is not a really a pointer to a node: it is an offset value. See above.
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*/
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typedef union ofnode_union {
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const struct device_node *np;
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long of_offset;
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} ofnode;
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struct ofnode_phandle_args {
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ofnode node;
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int args_count;
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uint32_t args[OF_MAX_PHANDLE_ARGS];
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};
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/**
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* ofprop - reference to a property of a device tree node
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*
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* This struct hold the reference on one property of one node,
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* using struct ofnode and an offset within the flat device tree or either
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* a pointer to a struct property in the live device tree.
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*
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* Thus we can reference arguments in both the live tree and the flat tree.
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*
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* The property reference can also hold a null reference. This corresponds to
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* a struct property NULL pointer or an offset of -1.
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*
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* @node: Pointer to device node
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* @offset: Pointer into flat device tree, used for flat tree.
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* @prop: Pointer to property, used for live treee.
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*/
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struct ofprop {
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ofnode node;
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union {
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int offset;
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const struct property *prop;
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};
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};
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/**
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* ofnode_to_np() - convert an ofnode to a live DT node pointer
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*
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* This cannot be called if the reference contains an offset.
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*
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* @node: Reference containing struct device_node * (possibly invalid)
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* @return pointer to device node (can be NULL)
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*/
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static inline const struct device_node *ofnode_to_np(ofnode node)
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{
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#ifdef OF_CHECKS
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if (!of_live_active())
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return NULL;
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#endif
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return node.np;
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}
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/**
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* ofnode_to_offset() - convert an ofnode to a flat DT offset
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*
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* This cannot be called if the reference contains a node pointer.
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*
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* @node: Reference containing offset (possibly invalid)
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* @return DT offset (can be -1)
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*/
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static inline int ofnode_to_offset(ofnode node)
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{
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#ifdef OF_CHECKS
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if (of_live_active())
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return -1;
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#endif
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return node.of_offset;
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}
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/**
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* ofnode_valid() - check if an ofnode is valid
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*
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* @return true if the reference contains a valid ofnode, false if it is NULL
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*/
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static inline bool ofnode_valid(ofnode node)
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{
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if (of_live_active())
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return node.np != NULL;
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else
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return node.of_offset >= 0;
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}
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/**
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* offset_to_ofnode() - convert a DT offset to an ofnode
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*
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* @of_offset: DT offset (either valid, or -1)
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* @return reference to the associated DT offset
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*/
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static inline ofnode offset_to_ofnode(int of_offset)
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{
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ofnode node;
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if (of_live_active())
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node.np = NULL;
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else
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node.of_offset = of_offset >= 0 ? of_offset : -1;
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return node;
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}
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/**
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* np_to_ofnode() - convert a node pointer to an ofnode
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*
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* @np: Live node pointer (can be NULL)
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* @return reference to the associated node pointer
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*/
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static inline ofnode np_to_ofnode(const struct device_node *np)
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{
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ofnode node;
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node.np = np;
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return node;
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}
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/**
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* ofnode_is_np() - check if a reference is a node pointer
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*
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* This function associated that if there is a valid live tree then all
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* references will use it. This is because using the flat DT when the live tree
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* is valid is not permitted.
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*
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* @node: reference to check (possibly invalid)
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* @return true if the reference is a live node pointer, false if it is a DT
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* offset
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*/
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static inline bool ofnode_is_np(ofnode node)
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{
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#ifdef OF_CHECKS
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/*
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* Check our assumption that flat tree offsets are not used when a
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* live tree is in use.
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*/
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assert(!ofnode_valid(node) ||
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(of_live_active() ? ofnode_to_np(node)
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: ofnode_to_np(node)));
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#endif
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return of_live_active() && ofnode_valid(node);
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}
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/**
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* ofnode_equal() - check if two references are equal
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*
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* @return true if equal, else false
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*/
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static inline bool ofnode_equal(ofnode ref1, ofnode ref2)
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{
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/* We only need to compare the contents */
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return ref1.of_offset == ref2.of_offset;
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}
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/**
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* ofnode_null() - Obtain a null ofnode
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*
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* This returns an ofnode which points to no node. It works both with the flat
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* tree and livetree.
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*/
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static inline ofnode ofnode_null(void)
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{
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ofnode node;
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if (of_live_active())
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node.np = NULL;
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else
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node.of_offset = -1;
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return node;
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}
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static inline ofnode ofnode_root(void)
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{
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ofnode node;
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if (of_live_active())
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node.np = gd_of_root();
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else
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node.of_offset = 0;
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return node;
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}
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/**
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* ofnode_read_u32() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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int ofnode_read_u32(ofnode node, const char *propname, u32 *outp);
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/**
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* ofnode_read_u32_index() - Read a 32-bit integer from a multi-value property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @index: index of the integer to return
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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int ofnode_read_u32_index(ofnode node, const char *propname, int index,
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u32 *outp);
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/**
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* ofnode_read_s32() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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static inline int ofnode_read_s32(ofnode node, const char *propname,
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s32 *out_value)
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{
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return ofnode_read_u32(node, propname, (u32 *)out_value);
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}
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/**
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* ofnode_read_u32_default() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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u32 ofnode_read_u32_default(ofnode ref, const char *propname, u32 def);
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/**
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* ofnode_read_u32_index_default() - Read a 32-bit integer from a multi-value
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* property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @index: index of the integer to return
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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u32 ofnode_read_u32_index_default(ofnode ref, const char *propname, int index,
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u32 def);
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/**
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* ofnode_read_s32_default() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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int ofnode_read_s32_default(ofnode node, const char *propname, s32 def);
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/**
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* ofnode_read_u64() - Read a 64-bit integer from a property
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*
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* @node: valid node reference to read property from
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* @propname: name of the property to read from
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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int ofnode_read_u64(ofnode node, const char *propname, u64 *outp);
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/**
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* ofnode_read_u64_default() - Read a 64-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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u64 ofnode_read_u64_default(ofnode node, const char *propname, u64 def);
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/**
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* ofnode_read_prop() - Read a property from a node
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*
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* @node: valid node reference to read property from
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* @propname: name of the property to read
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* @sizep: if non-NULL, returns the size of the property, or an error code
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if not found
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* @return property value, or NULL if there is no such property
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*/
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const void *ofnode_read_prop(ofnode node, const char *propname, int *sizep);
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/**
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* ofnode_read_string() - Read a string from a property
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*
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* @node: valid node reference to read property from
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* @propname: name of the property to read
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* @return string from property value, or NULL if there is no such property
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*/
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const char *ofnode_read_string(ofnode node, const char *propname);
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/**
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* ofnode_read_u32_array() - Find and read an array of 32 bit integers
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*
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* @node: valid node reference to read property from
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* @propname: name of the property to read
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* @out_values: pointer to return value, modified only if return value is 0
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* @sz: number of array elements to read
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* @return 0 if OK, -ve on error
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*
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* Search for a property in a device node and read 32-bit value(s) from
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* it. Returns 0 on success, -EINVAL if the property does not exist,
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* -ENODATA if property does not have a value, and -EOVERFLOW if the
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* property data isn't large enough.
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*
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* The out_values is modified only if a valid u32 value can be decoded.
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*/
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int ofnode_read_u32_array(ofnode node, const char *propname,
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u32 *out_values, size_t sz);
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/**
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* ofnode_read_bool() - read a boolean value from a property
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*
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* @node: valid node reference to read property from
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* @propname: name of property to read
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* @return true if property is present (meaning true), false if not present
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*/
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bool ofnode_read_bool(ofnode node, const char *propname);
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/**
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* ofnode_find_subnode() - find a named subnode of a parent node
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*
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* @node: valid reference to parent node
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* @subnode_name: name of subnode to find
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* @return reference to subnode (which can be invalid if there is no such
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* subnode)
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*/
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ofnode ofnode_find_subnode(ofnode node, const char *subnode_name);
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#if CONFIG_IS_ENABLED(DM_INLINE_OFNODE)
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static inline bool ofnode_is_enabled(ofnode node)
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{
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if (ofnode_is_np(node)) {
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return of_device_is_available(ofnode_to_np(node));
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} else {
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return fdtdec_get_is_enabled(gd->fdt_blob,
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ofnode_to_offset(node));
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}
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}
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static inline ofnode ofnode_first_subnode(ofnode node)
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{
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assert(ofnode_valid(node));
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if (ofnode_is_np(node))
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return np_to_ofnode(node.np->child);
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return offset_to_ofnode(
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fdt_first_subnode(gd->fdt_blob, ofnode_to_offset(node)));
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}
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static inline ofnode ofnode_next_subnode(ofnode node)
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{
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assert(ofnode_valid(node));
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if (ofnode_is_np(node))
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return np_to_ofnode(node.np->sibling);
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return offset_to_ofnode(
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fdt_next_subnode(gd->fdt_blob, ofnode_to_offset(node)));
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}
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#else
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/**
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* ofnode_is_enabled() - Checks whether a node is enabled.
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* This looks for a 'status' property. If this exists, then returns true if
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* the status is 'okay' and false otherwise. If there is no status property,
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* it returns true on the assumption that anything mentioned should be enabled
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* by default.
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*
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* @node: node to examine
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* @return false (not enabled) or true (enabled)
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*/
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bool ofnode_is_enabled(ofnode node);
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/**
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* ofnode_first_subnode() - find the first subnode of a parent node
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*
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* @node: valid reference to a valid parent node
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* @return reference to the first subnode (which can be invalid if the parent
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* node has no subnodes)
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*/
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ofnode ofnode_first_subnode(ofnode node);
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/**
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* ofnode_next_subnode() - find the next sibling of a subnode
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*
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* @node: valid reference to previous node (sibling)
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* @return reference to the next subnode (which can be invalid if the node
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* has no more siblings)
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*/
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ofnode ofnode_next_subnode(ofnode node);
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#endif /* DM_INLINE_OFNODE */
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/**
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* ofnode_get_parent() - get the ofnode's parent (enclosing ofnode)
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*
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* @node: valid node to look up
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* @return ofnode reference of the parent node
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*/
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ofnode ofnode_get_parent(ofnode node);
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/**
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* ofnode_get_name() - get the name of a node
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*
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* @node: valid node to look up
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* @return name of node
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*/
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const char *ofnode_get_name(ofnode node);
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/**
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* ofnode_get_by_phandle() - get ofnode from phandle
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*
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* @phandle: phandle to look up
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* @return ofnode reference to the phandle
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*/
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ofnode ofnode_get_by_phandle(uint phandle);
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/**
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* ofnode_read_size() - read the size of a property
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*
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* @node: node to check
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* @propname: property to check
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* @return size of property if present, or -EINVAL if not
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*/
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int ofnode_read_size(ofnode node, const char *propname);
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/**
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* ofnode_get_addr_size_index() - get an address/size from a node
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* based on index
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*
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* This reads the register address/size from a node based on index
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*
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* @node: node to read from
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* @index: Index of address to read (0 for first)
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* @size: Pointer to size of the address
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* @return address, or FDT_ADDR_T_NONE if not present or invalid
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*/
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phys_addr_t ofnode_get_addr_size_index(ofnode node, int index,
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fdt_size_t *size);
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/**
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* ofnode_get_addr_index() - get an address from a node
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*
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* This reads the register address from a node
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*
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* @node: node to read from
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* @index: Index of address to read (0 for first)
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* @return address, or FDT_ADDR_T_NONE if not present or invalid
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*/
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phys_addr_t ofnode_get_addr_index(ofnode node, int index);
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/**
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* ofnode_get_addr() - get an address from a node
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*
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* This reads the register address from a node
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*
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* @node: node to read from
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* @return address, or FDT_ADDR_T_NONE if not present or invalid
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*/
|
|
phys_addr_t ofnode_get_addr(ofnode node);
|
|
|
|
/**
|
|
* ofnode_stringlist_search() - find a string in a string list and return index
|
|
*
|
|
* Note that it is possible for this function to succeed on property values
|
|
* that are not NUL-terminated. That's because the function will stop after
|
|
* finding the first occurrence of @string. This can for example happen with
|
|
* small-valued cell properties, such as #address-cells, when searching for
|
|
* the empty string.
|
|
*
|
|
* @node: node to check
|
|
* @propname: name of the property containing the string list
|
|
* @string: string to look up in the string list
|
|
*
|
|
* @return:
|
|
* the index of the string in the list of strings
|
|
* -ENODATA if the property is not found
|
|
* -EINVAL on some other error
|
|
*/
|
|
int ofnode_stringlist_search(ofnode node, const char *propname,
|
|
const char *string);
|
|
|
|
/**
|
|
* ofnode_read_string_index() - obtain an indexed string from a string list
|
|
*
|
|
* Note that this will successfully extract strings from properties with
|
|
* non-NUL-terminated values. For example on small-valued cell properties
|
|
* this function will return the empty string.
|
|
*
|
|
* If non-NULL, the length of the string (on success) or a negative error-code
|
|
* (on failure) will be stored in the integer pointer to by lenp.
|
|
*
|
|
* @node: node to check
|
|
* @propname: name of the property containing the string list
|
|
* @index: index of the string to return
|
|
* @lenp: return location for the string length or an error code on failure
|
|
*
|
|
* @return:
|
|
* length of string, if found or -ve error value if not found
|
|
*/
|
|
int ofnode_read_string_index(ofnode node, const char *propname, int index,
|
|
const char **outp);
|
|
|
|
/**
|
|
* ofnode_read_string_count() - find the number of strings in a string list
|
|
*
|
|
* @node: node to check
|
|
* @propname: name of the property containing the string list
|
|
* @return:
|
|
* number of strings in the list, or -ve error value if not found
|
|
*/
|
|
int ofnode_read_string_count(ofnode node, const char *property);
|
|
|
|
/**
|
|
* ofnode_parse_phandle_with_args() - Find a node pointed by phandle in a list
|
|
*
|
|
* This function is useful to parse lists of phandles and their arguments.
|
|
* Returns 0 on success and fills out_args, on error returns appropriate
|
|
* errno value.
|
|
*
|
|
* Caller is responsible to call of_node_put() on the returned out_args->np
|
|
* pointer.
|
|
*
|
|
* Example:
|
|
*
|
|
* phandle1: node1 {
|
|
* #list-cells = <2>;
|
|
* }
|
|
*
|
|
* phandle2: node2 {
|
|
* #list-cells = <1>;
|
|
* }
|
|
*
|
|
* node3 {
|
|
* list = <&phandle1 1 2 &phandle2 3>;
|
|
* }
|
|
*
|
|
* To get a device_node of the `node2' node you may call this:
|
|
* ofnode_parse_phandle_with_args(node3, "list", "#list-cells", 0, 1, &args);
|
|
*
|
|
* @node: device tree node containing a list
|
|
* @list_name: property name that contains a list
|
|
* @cells_name: property name that specifies phandles' arguments count
|
|
* @cells_count: Cell count to use if @cells_name is NULL
|
|
* @index: index of a phandle to parse out
|
|
* @out_args: optional pointer to output arguments structure (will be filled)
|
|
* @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
|
|
* @list_name does not exist, -EINVAL if a phandle was not found,
|
|
* @cells_name could not be found, the arguments were truncated or there
|
|
* were too many arguments.
|
|
*/
|
|
int ofnode_parse_phandle_with_args(ofnode node, const char *list_name,
|
|
const char *cells_name, int cell_count,
|
|
int index,
|
|
struct ofnode_phandle_args *out_args);
|
|
|
|
/**
|
|
* ofnode_count_phandle_with_args() - Count number of phandle in a list
|
|
*
|
|
* This function is useful to count phandles into a list.
|
|
* Returns number of phandle on success, on error returns appropriate
|
|
* errno value.
|
|
*
|
|
* @node: device tree node containing a list
|
|
* @list_name: property name that contains a list
|
|
* @cells_name: property name that specifies phandles' arguments count
|
|
* @cells_count: Cell count to use if @cells_name is NULL
|
|
* @return number of phandle on success, -ENOENT if @list_name does not
|
|
* exist, -EINVAL if a phandle was not found, @cells_name could not
|
|
* be found.
|
|
*/
|
|
int ofnode_count_phandle_with_args(ofnode node, const char *list_name,
|
|
const char *cells_name, int cell_count);
|
|
|
|
/**
|
|
* ofnode_path() - find a node by full path
|
|
*
|
|
* @path: Full path to node, e.g. "/bus/spi@1"
|
|
* @return reference to the node found. Use ofnode_valid() to check if it exists
|
|
*/
|
|
ofnode ofnode_path(const char *path);
|
|
|
|
/**
|
|
* ofnode_read_chosen_prop() - get the value of a chosen property
|
|
*
|
|
* This looks for a property within the /chosen node and returns its value
|
|
*
|
|
* @propname: Property name to look for
|
|
* @sizep: Returns size of property, or FDT_ERR_... error code if function
|
|
* returns NULL
|
|
* @return property value if found, else NULL
|
|
*/
|
|
const void *ofnode_read_chosen_prop(const char *propname, int *sizep);
|
|
|
|
/**
|
|
* ofnode_read_chosen_string() - get the string value of a chosen property
|
|
*
|
|
* This looks for a property within the /chosen node and returns its value,
|
|
* checking that it is a valid nul-terminated string
|
|
*
|
|
* @propname: Property name to look for
|
|
* @return string value if found, else NULL
|
|
*/
|
|
const char *ofnode_read_chosen_string(const char *propname);
|
|
|
|
/**
|
|
* ofnode_get_chosen_node() - get a referenced node from the chosen node
|
|
*
|
|
* This looks up a named property in the chosen node and uses that as a path to
|
|
* look up a code.
|
|
*
|
|
* @return the referenced node if present, else ofnode_null()
|
|
*/
|
|
ofnode ofnode_get_chosen_node(const char *propname);
|
|
|
|
/**
|
|
* ofnode_read_aliases_prop() - get the value of a aliases property
|
|
*
|
|
* This looks for a property within the /aliases node and returns its value
|
|
*
|
|
* @propname: Property name to look for
|
|
* @sizep: Returns size of property, or FDT_ERR_... error code if function
|
|
* returns NULL
|
|
* @return property value if found, else NULL
|
|
*/
|
|
const void *ofnode_read_aliases_prop(const char *propname, int *sizep);
|
|
|
|
/**
|
|
* ofnode_get_aliases_node() - get a referenced node from the aliases node
|
|
*
|
|
* This looks up a named property in the aliases node and uses that as a path to
|
|
* look up a code.
|
|
*
|
|
* @return the referenced node if present, else ofnode_null()
|
|
*/
|
|
ofnode ofnode_get_aliases_node(const char *propname);
|
|
|
|
struct display_timing;
|
|
/**
|
|
* ofnode_decode_display_timing() - decode display timings
|
|
*
|
|
* Decode display timings from the supplied 'display-timings' node.
|
|
* See doc/device-tree-bindings/video/display-timing.txt for binding
|
|
* information.
|
|
*
|
|
* @node 'display-timing' node containing the timing subnodes
|
|
* @index Index number to read (0=first timing subnode)
|
|
* @config Place to put timings
|
|
* @return 0 if OK, -FDT_ERR_NOTFOUND if not found
|
|
*/
|
|
int ofnode_decode_display_timing(ofnode node, int index,
|
|
struct display_timing *config);
|
|
|
|
/**
|
|
* ofnode_get_property() - get a pointer to the value of a node property
|
|
*
|
|
* @node: node to read
|
|
* @propname: property to read
|
|
* @lenp: place to put length on success
|
|
* @return pointer to property, or NULL if not found
|
|
*/
|
|
const void *ofnode_get_property(ofnode node, const char *propname, int *lenp);
|
|
|
|
/**
|
|
* ofnode_get_first_property()- get the reference of the first property
|
|
*
|
|
* Get reference to the first property of the node, it is used to iterate
|
|
* and read all the property with ofnode_get_property_by_prop().
|
|
*
|
|
* @node: node to read
|
|
* @prop: place to put argument reference
|
|
* @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
|
|
*/
|
|
int ofnode_get_first_property(ofnode node, struct ofprop *prop);
|
|
|
|
/**
|
|
* ofnode_get_next_property() - get the reference of the next property
|
|
*
|
|
* Get reference to the next property of the node, it is used to iterate
|
|
* and read all the property with ofnode_get_property_by_prop().
|
|
*
|
|
* @prop: reference of current argument and place to put reference of next one
|
|
* @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
|
|
*/
|
|
int ofnode_get_next_property(struct ofprop *prop);
|
|
|
|
/**
|
|
* ofnode_get_property_by_prop() - get a pointer to the value of a property
|
|
*
|
|
* Get value for the property identified by the provided reference.
|
|
*
|
|
* @prop: reference on property
|
|
* @propname: If non-NULL, place to property name on success,
|
|
* @lenp: If non-NULL, place to put length on success
|
|
* @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
|
|
*/
|
|
const void *ofnode_get_property_by_prop(const struct ofprop *prop,
|
|
const char **propname, int *lenp);
|
|
|
|
/**
|
|
* ofnode_is_available() - check if a node is marked available
|
|
*
|
|
* @node: node to check
|
|
* @return true if node's 'status' property is "okay" (or is missing)
|
|
*/
|
|
bool ofnode_is_available(ofnode node);
|
|
|
|
/**
|
|
* ofnode_get_addr_size() - get address and size from a property
|
|
*
|
|
* This does no address translation. It simply reads an property that contains
|
|
* an address and a size value, one after the other.
|
|
*
|
|
* @node: node to read from
|
|
* @propname: property to read
|
|
* @sizep: place to put size value (on success)
|
|
* @return address value, or FDT_ADDR_T_NONE on error
|
|
*/
|
|
phys_addr_t ofnode_get_addr_size(ofnode node, const char *propname,
|
|
phys_size_t *sizep);
|
|
|
|
/**
|
|
* ofnode_read_u8_array_ptr() - find an 8-bit array
|
|
*
|
|
* Look up a property in a node and return a pointer to its contents as a
|
|
* byte array of given length. The property must have at least enough data
|
|
* for the array (count bytes). It may have more, but this will be ignored.
|
|
* The data is not copied.
|
|
*
|
|
* @node node to examine
|
|
* @propname name of property to find
|
|
* @sz number of array elements
|
|
* @return pointer to byte array if found, or NULL if the property is not
|
|
* found or there is not enough data
|
|
*/
|
|
const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
|
|
size_t sz);
|
|
|
|
/**
|
|
* ofnode_read_pci_addr() - look up a PCI address
|
|
*
|
|
* Look at an address property in a node and return the PCI address which
|
|
* corresponds to the given type in the form of fdt_pci_addr.
|
|
* The property must hold one fdt_pci_addr with a lengh.
|
|
*
|
|
* @node node to examine
|
|
* @type pci address type (FDT_PCI_SPACE_xxx)
|
|
* @propname name of property to find
|
|
* @addr returns pci address in the form of fdt_pci_addr
|
|
* @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
|
|
* format of the property was invalid, -ENXIO if the requested
|
|
* address type was not found
|
|
*/
|
|
int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
|
|
const char *propname, struct fdt_pci_addr *addr);
|
|
|
|
/**
|
|
* ofnode_read_pci_vendev() - look up PCI vendor and device id
|
|
*
|
|
* Look at the compatible property of a device node that represents a PCI
|
|
* device and extract pci vendor id and device id from it.
|
|
*
|
|
* @param node node to examine
|
|
* @param vendor vendor id of the pci device
|
|
* @param device device id of the pci device
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device);
|
|
|
|
/**
|
|
* ofnode_read_addr_cells() - Get the number of address cells for a node
|
|
*
|
|
* This walks back up the tree to find the closest #address-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @node: Node to check
|
|
* @return number of address cells this node uses
|
|
*/
|
|
int ofnode_read_addr_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_read_size_cells() - Get the number of size cells for a node
|
|
*
|
|
* This walks back up the tree to find the closest #size-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @node: Node to check
|
|
* @return number of size cells this node uses
|
|
*/
|
|
int ofnode_read_size_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_read_simple_addr_cells() - Get the address cells property in a node
|
|
*
|
|
* This function matches fdt_address_cells().
|
|
*
|
|
* @np: Node pointer to check
|
|
* @return value of #address-cells property in this node, or 2 if none
|
|
*/
|
|
int ofnode_read_simple_addr_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_read_simple_size_cells() - Get the size cells property in a node
|
|
*
|
|
* This function matches fdt_size_cells().
|
|
*
|
|
* @np: Node pointer to check
|
|
* @return value of #size-cells property in this node, or 2 if none
|
|
*/
|
|
int ofnode_read_simple_size_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_pre_reloc() - check if a node should be bound before relocation
|
|
*
|
|
* Device tree nodes can be marked as needing-to-be-bound in the loader stages
|
|
* via special device tree properties.
|
|
*
|
|
* Before relocation this function can be used to check if nodes are required
|
|
* in either SPL or TPL stages.
|
|
*
|
|
* After relocation and jumping into the real U-Boot binary it is possible to
|
|
* determine if a node was bound in one of SPL/TPL stages.
|
|
*
|
|
* There are 4 settings currently in use
|
|
* - u-boot,dm-pre-proper: U-Boot proper pre-relocation only
|
|
* - u-boot,dm-pre-reloc: legacy and indicates any of TPL or SPL
|
|
* Existing platforms only use it to indicate nodes needed in
|
|
* SPL. Should probably be replaced by u-boot,dm-spl for
|
|
* new platforms.
|
|
* - u-boot,dm-spl: SPL and U-Boot pre-relocation
|
|
* - u-boot,dm-tpl: TPL and U-Boot pre-relocation
|
|
*
|
|
* @node: node to check
|
|
* @return true if node is needed in SPL/TL, false otherwise
|
|
*/
|
|
bool ofnode_pre_reloc(ofnode node);
|
|
|
|
/**
|
|
* ofnode_read_resource() - Read a resource from a node
|
|
*
|
|
* Read resource information from a node at the given index
|
|
*
|
|
* @node: Node to read from
|
|
* @index: Index of resource to read (0 = first)
|
|
* @res: Returns resource that was read, on success
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int ofnode_read_resource(ofnode node, uint index, struct resource *res);
|
|
|
|
/**
|
|
* ofnode_read_resource_byname() - Read a resource from a node by name
|
|
*
|
|
* Read resource information from a node matching the given name. This uses a
|
|
* 'reg-names' string list property with the names matching the associated
|
|
* 'reg' property list.
|
|
*
|
|
* @node: Node to read from
|
|
* @name: Name of resource to read
|
|
* @res: Returns resource that was read, on success
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int ofnode_read_resource_byname(ofnode node, const char *name,
|
|
struct resource *res);
|
|
|
|
/**
|
|
* ofnode_by_compatible() - Find the next compatible node
|
|
*
|
|
* Find the next node after @from that is compatible with @compat
|
|
*
|
|
* @from: ofnode to start from (use ofnode_null() to start at the beginning)
|
|
* @compat: Compatible string to match
|
|
* @return ofnode found, or ofnode_null() if none
|
|
*/
|
|
ofnode ofnode_by_compatible(ofnode from, const char *compat);
|
|
|
|
/**
|
|
* ofnode_by_prop_value() - Find the next node with given property value
|
|
*
|
|
* Find the next node after @from that has a @propname with a value
|
|
* @propval and a length @proplen.
|
|
*
|
|
* @from: ofnode to start from (use ofnode_null() to start at the
|
|
* beginning) @propname: property name to check @propval: property value to
|
|
* search for @proplen: length of the value in propval @return ofnode
|
|
* found, or ofnode_null() if none
|
|
*/
|
|
ofnode ofnode_by_prop_value(ofnode from, const char *propname,
|
|
const void *propval, int proplen);
|
|
|
|
/**
|
|
* ofnode_for_each_subnode() - iterate over all subnodes of a parent
|
|
*
|
|
* @node: child node (ofnode, lvalue)
|
|
* @parent: parent node (ofnode)
|
|
*
|
|
* This is a wrapper around a for loop and is used like so:
|
|
*
|
|
* ofnode node;
|
|
*
|
|
* ofnode_for_each_subnode(node, parent) {
|
|
* Use node
|
|
* ...
|
|
* }
|
|
*
|
|
* Note that this is implemented as a macro and @node is used as
|
|
* iterator in the loop. The parent variable can be a constant or even a
|
|
* literal.
|
|
*/
|
|
#define ofnode_for_each_subnode(node, parent) \
|
|
for (node = ofnode_first_subnode(parent); \
|
|
ofnode_valid(node); \
|
|
node = ofnode_next_subnode(node))
|
|
|
|
/**
|
|
* ofnode_get_child_count() - get the child count of a ofnode
|
|
*
|
|
* @node: valid node to get its child count
|
|
* @return the number of subnodes
|
|
*/
|
|
int ofnode_get_child_count(ofnode parent);
|
|
|
|
/**
|
|
* ofnode_translate_address() - Translate a device-tree address
|
|
*
|
|
* Translate an address from the device-tree into a CPU physical address. This
|
|
* function walks up the tree and applies the various bus mappings along the
|
|
* way.
|
|
*
|
|
* @ofnode: Device tree node giving the context in which to translate the
|
|
* address
|
|
* @in_addr: pointer to the address to translate
|
|
* @return the translated address; OF_BAD_ADDR on error
|
|
*/
|
|
u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
|
|
|
|
/**
|
|
* ofnode_translate_dma_address() - Translate a device-tree DMA address
|
|
*
|
|
* Translate a DMA address from the device-tree into a CPU physical address.
|
|
* This function walks up the tree and applies the various bus mappings along
|
|
* the way.
|
|
*
|
|
* @ofnode: Device tree node giving the context in which to translate the
|
|
* DMA address
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|
* @in_addr: pointer to the DMA address to translate
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|
* @return the translated DMA address; OF_BAD_ADDR on error
|
|
*/
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|
u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr);
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|
|
|
/**
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* ofnode_device_is_compatible() - check if the node is compatible with compat
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|
*
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|
* This allows to check whether the node is comaptible with the compat.
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|
*
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|
* @node: Device tree node for which compatible needs to be verified.
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|
* @compat: Compatible string which needs to verified in the given node.
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|
* @return true if OK, false if the compatible is not found
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|
*/
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|
int ofnode_device_is_compatible(ofnode node, const char *compat);
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|
|
|
/**
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|
* ofnode_write_prop() - Set a property of a ofnode
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|
*
|
|
* Note that the value passed to the function is *not* allocated by the
|
|
* function itself, but must be allocated by the caller if necessary.
|
|
*
|
|
* @node: The node for whose property should be set
|
|
* @propname: The name of the property to set
|
|
* @len: The length of the new value of the property
|
|
* @value: The new value of the property (must be valid prior to calling
|
|
* the function)
|
|
* @return 0 if successful, -ve on error
|
|
*/
|
|
int ofnode_write_prop(ofnode node, const char *propname, int len,
|
|
const void *value);
|
|
|
|
/**
|
|
* ofnode_write_string() - Set a string property of a ofnode
|
|
*
|
|
* Note that the value passed to the function is *not* allocated by the
|
|
* function itself, but must be allocated by the caller if necessary.
|
|
*
|
|
* @node: The node for whose string property should be set
|
|
* @propname: The name of the string property to set
|
|
* @value: The new value of the string property (must be valid prior to
|
|
* calling the function)
|
|
* @return 0 if successful, -ve on error
|
|
*/
|
|
int ofnode_write_string(ofnode node, const char *propname, const char *value);
|
|
|
|
/**
|
|
* ofnode_set_enabled() - Enable or disable a device tree node given by its
|
|
* ofnode
|
|
*
|
|
* This function effectively sets the node's "status" property to either "okay"
|
|
* or "disable", hence making it available for driver model initialization or
|
|
* not.
|
|
*
|
|
* @node: The node to enable
|
|
* @value: Flag that tells the function to either disable or enable the
|
|
* node
|
|
* @return 0 if successful, -ve on error
|
|
*/
|
|
int ofnode_set_enabled(ofnode node, bool value);
|
|
|
|
#endif
|