mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
61e51babdb
This function returns the pointer to the value of a node property. The current name ofnode_read_prop() is confusing. Follow the naming of_get_property() from Linux. The return type (const u32 *) is wrong. DT property values can be strings as well as integers. This is why of_get_property/fdt_getprop returns an opaque pointer. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Simon Glass <sjg@chromium.org>
501 lines
14 KiB
C
501 lines
14 KiB
C
/*
|
|
* Function to read values from the device tree node attached to a udevice.
|
|
*
|
|
* Copyright (c) 2017 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _DM_READ_H
|
|
#define _DM_READ_H
|
|
|
|
#include <dm/fdtaddr.h>
|
|
#include <dm/ofnode.h>
|
|
#include <dm/uclass.h>
|
|
|
|
struct resource;
|
|
|
|
#if CONFIG_IS_ENABLED(OF_LIVE)
|
|
static inline const struct device_node *dev_np(struct udevice *dev)
|
|
{
|
|
return ofnode_to_np(dev->node);
|
|
}
|
|
#else
|
|
static inline const struct device_node *dev_np(struct udevice *dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* dev_ofnode() - get the DT node reference associated with a udevice
|
|
*
|
|
* @dev: device to check
|
|
* @return reference of the the device's DT node
|
|
*/
|
|
static inline ofnode dev_ofnode(struct udevice *dev)
|
|
{
|
|
return dev->node;
|
|
}
|
|
|
|
static inline bool dev_of_valid(struct udevice *dev)
|
|
{
|
|
return ofnode_valid(dev_ofnode(dev));
|
|
}
|
|
|
|
/**
|
|
* dev_read_resource() - obtain an indexed resource from a device.
|
|
*
|
|
* @dev: devuce to examine
|
|
* @index index of the resource to retrieve (0 = first)
|
|
* @res returns the resource
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
int dev_read_resource(struct udevice *dev, uint index, struct resource *res);
|
|
|
|
#ifndef CONFIG_DM_DEV_READ_INLINE
|
|
/**
|
|
* dev_read_u32_default() - read a 32-bit integer from a device's DT property
|
|
*
|
|
* @dev: device to read DT property from
|
|
* @propname: name of the property to read from
|
|
* @def: default value to return if the property has no value
|
|
* @return property value, or @def if not found
|
|
*/
|
|
int dev_read_u32_default(struct udevice *dev, const char *propname, int def);
|
|
|
|
/**
|
|
* dev_read_string() - Read a string from a device's DT property
|
|
*
|
|
* @dev: device to read DT property from
|
|
* @propname: name of the property to read
|
|
* @return string from property value, or NULL if there is no such property
|
|
*/
|
|
const char *dev_read_string(struct udevice *dev, const char *propname);
|
|
|
|
/**
|
|
* dev_read_bool() - read a boolean value from a device's DT property
|
|
*
|
|
* @dev: device to read DT property from
|
|
* @propname: name of property to read
|
|
* @return true if property is present (meaning true), false if not present
|
|
*/
|
|
bool dev_read_bool(struct udevice *dev, const char *propname);
|
|
|
|
/**
|
|
* dev_read_subnode() - find a named subnode of a device
|
|
*
|
|
* @dev: device whose DT node contains the subnode
|
|
* @subnode_name: name of subnode to find
|
|
* @return reference to subnode (which can be invalid if there is no such
|
|
* subnode)
|
|
*/
|
|
ofnode dev_read_subnode(struct udevice *dev, const char *subbnode_name);
|
|
|
|
/**
|
|
* dev_read_size() - read the size of a property
|
|
*
|
|
* @dev: device to check
|
|
* @propname: property to check
|
|
* @return size of property if present, or -EINVAL if not
|
|
*/
|
|
int dev_read_size(struct udevice *dev, const char *propname);
|
|
|
|
/**
|
|
* dev_read_addr_index() - Get the indexed reg property of a device
|
|
*
|
|
* @dev: Device to read from
|
|
* @index: the 'reg' property can hold a list of <addr, size> pairs
|
|
* and @index is used to select which one is required
|
|
*
|
|
* @return address or FDT_ADDR_T_NONE if not found
|
|
*/
|
|
fdt_addr_t dev_read_addr_index(struct udevice *dev, int index);
|
|
|
|
/**
|
|
* dev_read_addr() - Get the reg property of a device
|
|
*
|
|
* @dev: Device to read from
|
|
*
|
|
* @return address or FDT_ADDR_T_NONE if not found
|
|
*/
|
|
fdt_addr_t dev_read_addr(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_addr_size() - get address and size from a device property
|
|
*
|
|
* This does no address translation. It simply reads an property that contains
|
|
* an address and a size value, one after the other.
|
|
*
|
|
* @dev: Device 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
|
|
*/
|
|
fdt_addr_t dev_read_addr_size(struct udevice *dev, const char *propname,
|
|
fdt_size_t *sizep);
|
|
|
|
/**
|
|
* dev_read_name() - get the name of a device's node
|
|
*
|
|
* @node: valid node to look up
|
|
* @return name of node
|
|
*/
|
|
const char *dev_read_name(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_stringlist_search() - find 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.
|
|
*
|
|
* @dev: device 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 dev_read_stringlist_search(struct udevice *dev, const char *property,
|
|
const char *string);
|
|
|
|
/**
|
|
* dev_read_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:
|
|
* dev_read_phandle_with_args(dev, "list", "#list-cells", 0, 1, &args);
|
|
*
|
|
* @dev: device whose 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 dev_read_phandle_with_args(struct udevice *dev, const char *list_name,
|
|
const char *cells_name, int cell_count,
|
|
int index,
|
|
struct ofnode_phandle_args *out_args);
|
|
|
|
/**
|
|
* dev_read_addr_cells() - Get the number of address cells for a device's node
|
|
*
|
|
* This walks back up the tree to find the closest #address-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @dev: devioe to check
|
|
* @return number of address cells this node uses
|
|
*/
|
|
int dev_read_addr_cells(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_size_cells() - Get the number of size cells for a device's node
|
|
*
|
|
* This walks back up the tree to find the closest #size-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @dev: devioe to check
|
|
* @return number of size cells this node uses
|
|
*/
|
|
int dev_read_size_cells(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_addr_cells() - Get the address cells property in a node
|
|
*
|
|
* This function matches fdt_address_cells().
|
|
*
|
|
* @dev: devioe to check
|
|
* @return number of address cells this node uses
|
|
*/
|
|
int dev_read_simple_addr_cells(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_size_cells() - Get the size cells property in a node
|
|
*
|
|
* This function matches fdt_size_cells().
|
|
*
|
|
* @dev: devioe to check
|
|
* @return number of size cells this node uses
|
|
*/
|
|
int dev_read_simple_size_cells(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_phandle() - Get the phandle from a device
|
|
*
|
|
* @dev: device to check
|
|
* @return phandle (1 or greater), or 0 if no phandle or other error
|
|
*/
|
|
int dev_read_phandle(struct udevice *dev);
|
|
|
|
/**
|
|
* dev_read_prop()- - read a property from a device's node
|
|
*
|
|
* @dev: device to check
|
|
* @propname: property to read
|
|
* @lenp: place to put length on success
|
|
* @return pointer to property, or NULL if not found
|
|
*/
|
|
const u32 *dev_read_prop(struct udevice *dev, const char *propname, int *lenp);
|
|
|
|
/**
|
|
* dev_read_alias_seq() - Get the alias sequence number of a node
|
|
*
|
|
* This works out whether a node is pointed to by an alias, and if so, the
|
|
* sequence number of that alias. Aliases are of the form <base><num> where
|
|
* <num> is the sequence number. For example spi2 would be sequence number 2.
|
|
*
|
|
* @dev: device to look up
|
|
* @devnump: set to the sequence number if one is found
|
|
* @return 0 if a sequence was found, -ve if not
|
|
*/
|
|
int dev_read_alias_seq(struct udevice *dev, int *devnump);
|
|
|
|
/**
|
|
* dev_read_u32_array() - Find and read an array of 32 bit integers
|
|
*
|
|
* Search for a property in a device node and read 32-bit value(s) from
|
|
* it.
|
|
*
|
|
* The out_values is modified only if a valid u32 value can be decoded.
|
|
*
|
|
* @dev: device to look up
|
|
* @propname: name of the property to read
|
|
* @out_values: pointer to return value, modified only if return value is 0
|
|
* @sz: number of array elements to read
|
|
* @return 0 on success, -EINVAL if the property does not exist, -ENODATA if
|
|
* property does not have a value, and -EOVERFLOW if the property data isn't
|
|
* large enough.
|
|
*/
|
|
int dev_read_u32_array(struct udevice *dev, const char *propname,
|
|
u32 *out_values, size_t sz);
|
|
|
|
/**
|
|
* dev_read_first_subnode() - find the first subnode of a device's node
|
|
*
|
|
* @dev: device to look up
|
|
* @return reference to the first subnode (which can be invalid if the device's
|
|
* node has no subnodes)
|
|
*/
|
|
ofnode dev_read_first_subnode(struct udevice *dev);
|
|
|
|
/**
|
|
* ofnode_next_subnode() - find the next sibling of a subnode
|
|
*
|
|
* @node: valid reference to previous node (sibling)
|
|
* @return reference to the next subnode (which can be invalid if the node
|
|
* has no more siblings)
|
|
*/
|
|
ofnode dev_read_next_subnode(ofnode node);
|
|
|
|
/**
|
|
* dev_read_u8_array_ptr() - find an 8-bit array
|
|
*
|
|
* Look up a device's node property 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.
|
|
*
|
|
* @dev: device to look up
|
|
* @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 *dev_read_u8_array_ptr(struct udevice *dev, const char *propname,
|
|
size_t sz);
|
|
|
|
/**
|
|
* dev_read_enabled() - check whether a node is enabled
|
|
*
|
|
* This looks for a 'status' property. If this exists, then returns 1 if
|
|
* the status is 'ok' and 0 otherwise. If there is no status property,
|
|
* it returns 1 on the assumption that anything mentioned should be enabled
|
|
* by default.
|
|
*
|
|
* @dev: device to examine
|
|
* @return integer value 0 (not enabled) or 1 (enabled)
|
|
*/
|
|
int dev_read_enabled(struct udevice *dev);
|
|
|
|
#else /* CONFIG_DM_DEV_READ_INLINE is enabled */
|
|
|
|
static inline int dev_read_u32_default(struct udevice *dev,
|
|
const char *propname, int def)
|
|
{
|
|
return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
|
|
}
|
|
|
|
static inline const char *dev_read_string(struct udevice *dev,
|
|
const char *propname)
|
|
{
|
|
return ofnode_read_string(dev_ofnode(dev), propname);
|
|
}
|
|
|
|
static inline bool dev_read_bool(struct udevice *dev, const char *propname)
|
|
{
|
|
return ofnode_read_bool(dev_ofnode(dev), propname);
|
|
}
|
|
|
|
static inline ofnode dev_read_subnode(struct udevice *dev,
|
|
const char *subbnode_name)
|
|
{
|
|
return ofnode_find_subnode(dev_ofnode(dev), subbnode_name);
|
|
}
|
|
|
|
static inline int dev_read_size(struct udevice *dev, const char *propname)
|
|
{
|
|
return ofnode_read_size(dev_ofnode(dev), propname);
|
|
}
|
|
|
|
static inline fdt_addr_t dev_read_addr_index(struct udevice *dev, int index)
|
|
{
|
|
return devfdt_get_addr_index(dev, index);
|
|
}
|
|
|
|
static inline fdt_addr_t dev_read_addr(struct udevice *dev)
|
|
{
|
|
return devfdt_get_addr(dev);
|
|
}
|
|
|
|
static inline fdt_addr_t dev_read_addr_size(struct udevice *dev,
|
|
const char *propname,
|
|
fdt_size_t *sizep)
|
|
{
|
|
return ofnode_get_addr_size(dev_ofnode(dev), propname, sizep);
|
|
}
|
|
|
|
static inline const char *dev_read_name(struct udevice *dev)
|
|
{
|
|
return ofnode_get_name(dev_ofnode(dev));
|
|
}
|
|
|
|
static inline int dev_read_stringlist_search(struct udevice *dev,
|
|
const char *propname,
|
|
const char *string)
|
|
{
|
|
return ofnode_stringlist_search(dev_ofnode(dev), propname, string);
|
|
}
|
|
|
|
static inline int dev_read_phandle_with_args(struct udevice *dev,
|
|
const char *list_name, const char *cells_name, int cell_count,
|
|
int index, struct ofnode_phandle_args *out_args)
|
|
{
|
|
return ofnode_parse_phandle_with_args(dev_ofnode(dev), list_name,
|
|
cells_name, cell_count, index,
|
|
out_args);
|
|
}
|
|
|
|
static inline int dev_read_addr_cells(struct udevice *dev)
|
|
{
|
|
/* NOTE: this call should walk up the parent stack */
|
|
return fdt_address_cells(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
static inline int dev_read_size_cells(struct udevice *dev)
|
|
{
|
|
/* NOTE: this call should walk up the parent stack */
|
|
return fdt_size_cells(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
static inline int dev_read_simple_addr_cells(struct udevice *dev)
|
|
{
|
|
return fdt_address_cells(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
static inline int dev_read_simple_size_cells(struct udevice *dev)
|
|
{
|
|
return fdt_size_cells(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
static inline int dev_read_phandle(struct udevice *dev)
|
|
{
|
|
return fdt_get_phandle(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
static inline const u32 *dev_read_prop(struct udevice *dev,
|
|
const char *propname, int *lenp)
|
|
{
|
|
return ofnode_get_property(dev_ofnode(dev), propname, lenp);
|
|
}
|
|
|
|
static inline int dev_read_alias_seq(struct udevice *dev, int *devnump)
|
|
{
|
|
return fdtdec_get_alias_seq(gd->fdt_blob, dev->uclass->uc_drv->name,
|
|
dev_of_offset(dev), devnump);
|
|
}
|
|
|
|
static inline int dev_read_u32_array(struct udevice *dev, const char *propname,
|
|
u32 *out_values, size_t sz)
|
|
{
|
|
return ofnode_read_u32_array(dev_ofnode(dev), propname, out_values, sz);
|
|
}
|
|
|
|
static inline ofnode dev_read_first_subnode(struct udevice *dev)
|
|
{
|
|
return ofnode_first_subnode(dev_ofnode(dev));
|
|
}
|
|
|
|
static inline ofnode dev_read_next_subnode(ofnode node)
|
|
{
|
|
return ofnode_next_subnode(node);
|
|
}
|
|
|
|
static inline const uint8_t *dev_read_u8_array_ptr(struct udevice *dev,
|
|
const char *propname, size_t sz)
|
|
{
|
|
return ofnode_read_u8_array_ptr(dev_ofnode(dev), propname, sz);
|
|
}
|
|
|
|
static inline int dev_read_enabled(struct udevice *dev)
|
|
{
|
|
return fdtdec_get_is_enabled(gd->fdt_blob, dev_of_offset(dev));
|
|
}
|
|
|
|
#endif /* CONFIG_DM_DEV_READ_INLINE */
|
|
|
|
/**
|
|
* dev_for_each_subnode() - Helper function to iterate through subnodes
|
|
*
|
|
* This creates a for() loop which works through the subnodes in a device's
|
|
* device-tree node.
|
|
*
|
|
* @subnode: ofnode holding the current subnode
|
|
* @dev: device to use for interation (struct udevice *)
|
|
*/
|
|
#define dev_for_each_subnode(subnode, dev) \
|
|
for (subnode = dev_read_first_subnode(dev); \
|
|
ofnode_valid(subnode); \
|
|
subnode = ofnode_next_subnode(subnode))
|
|
|
|
#endif
|