mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 13:43:28 +00:00
drivers: Add a new framework for multiplexer devices
Add a new subsystem that handles multiplexer controllers. The API is the
same as in Linux.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
[trini: Update some error calls to use different functions or pass
correct arguments]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Jean-Jacques Hiblot
Tom Rini
parent
39dd7c1d6b
commit
0ad40b2463
9 changed files with 606 additions and 0 deletions
|
|
@ -64,6 +64,8 @@ source "drivers/mmc/Kconfig"
|
|||
|
||||
source "drivers/mtd/Kconfig"
|
||||
|
||||
source "drivers/mux/Kconfig"
|
||||
|
||||
source "drivers/net/Kconfig"
|
||||
|
||||
source "drivers/nvme/Kconfig"
|
||||
|
|
|
|||
|
|
@ -14,6 +14,7 @@ obj-$(CONFIG_$(SPL_TPL_)INPUT) += input/
|
|||
obj-$(CONFIG_$(SPL_TPL_)LED) += led/
|
||||
obj-$(CONFIG_$(SPL_TPL_)MMC_SUPPORT) += mmc/
|
||||
obj-y += mtd/
|
||||
obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux/
|
||||
obj-$(CONFIG_$(SPL_TPL_)PCH_SUPPORT) += pch/
|
||||
obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
|
||||
obj-$(CONFIG_$(SPL_TPL_)PHY) += phy/
|
||||
|
|
|
|||
11
drivers/mux/Kconfig
Normal file
11
drivers/mux/Kconfig
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
menu "Multiplexer drivers"
|
||||
|
||||
config MULTIPLEXER
|
||||
bool "Multiplexer Support"
|
||||
depends on DM
|
||||
help
|
||||
The mux framework is a minimalistic subsystem that handles multiplexer
|
||||
controllers. It provides the same API as Linux and mux drivers should
|
||||
be portable with a minimum effort.
|
||||
|
||||
endmenu
|
||||
6
drivers/mux/Makefile
Normal file
6
drivers/mux/Makefile
Normal file
|
|
@ -0,0 +1,6 @@
|
|||
# SPDX-License-Identifier: GPL-2.0+
|
||||
#
|
||||
# (C) Copyright 2019
|
||||
# Jean-Jacques Hiblot <jjhiblot@ti.com>
|
||||
|
||||
obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux-uclass.o
|
||||
312
drivers/mux/mux-uclass.c
Normal file
312
drivers/mux/mux-uclass.c
Normal file
|
|
@ -0,0 +1,312 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Multiplexer subsystem
|
||||
*
|
||||
* Based on the linux multiplexer framework
|
||||
*
|
||||
* Copyright (C) 2017 Axentia Technologies AB
|
||||
* Author: Peter Rosin <peda@axentia.se>
|
||||
*
|
||||
* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
|
||||
* Jean-Jacques Hiblot <jjhiblot@ti.com>
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <dm.h>
|
||||
#include <mux-internal.h>
|
||||
#include <dm/device-internal.h>
|
||||
#include <dm/device_compat.h>
|
||||
#include <dm/devres.h>
|
||||
#include <dt-bindings/mux/mux.h>
|
||||
#include <linux/bug.h>
|
||||
|
||||
/*
|
||||
* The idle-as-is "state" is not an actual state that may be selected, it
|
||||
* only implies that the state should not be changed. So, use that state
|
||||
* as indication that the cached state of the multiplexer is unknown.
|
||||
*/
|
||||
#define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS
|
||||
|
||||
/**
|
||||
* mux_control_ops() - Get the mux_control ops.
|
||||
* @dev: The client device.
|
||||
*
|
||||
* Return: A pointer to the 'mux_control_ops' of the device.
|
||||
*/
|
||||
static inline const struct mux_control_ops *mux_dev_ops(struct udevice *dev)
|
||||
{
|
||||
return (const struct mux_control_ops *)dev->driver->ops;
|
||||
}
|
||||
|
||||
/**
|
||||
* mux_control_set() - Set the state of the given mux controller.
|
||||
* @mux: A multiplexer control
|
||||
* @state: The new requested state.
|
||||
*
|
||||
* Return: 0 if OK, or a negative error code.
|
||||
*/
|
||||
static int mux_control_set(struct mux_control *mux, int state)
|
||||
{
|
||||
int ret = mux_dev_ops(mux->dev)->set(mux, state);
|
||||
|
||||
mux->cached_state = ret < 0 ? MUX_CACHE_UNKNOWN : state;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
unsigned int mux_control_states(struct mux_control *mux)
|
||||
{
|
||||
return mux->states;
|
||||
}
|
||||
|
||||
/**
|
||||
* __mux_control_select() - Select the given multiplexer state.
|
||||
* @mux: The mux-control to request a change of state from.
|
||||
* @state: The new requested state.
|
||||
*
|
||||
* Try to set the mux to the requested state. If not, try to revert if
|
||||
* appropriate.
|
||||
*/
|
||||
static int __mux_control_select(struct mux_control *mux, int state)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (WARN_ON(state < 0 || state >= mux->states))
|
||||
return -EINVAL;
|
||||
|
||||
if (mux->cached_state == state)
|
||||
return 0;
|
||||
|
||||
ret = mux_control_set(mux, state);
|
||||
if (ret >= 0)
|
||||
return 0;
|
||||
|
||||
/* The mux update failed, try to revert if appropriate... */
|
||||
if (mux->idle_state != MUX_IDLE_AS_IS)
|
||||
mux_control_set(mux, mux->idle_state);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int mux_control_select(struct mux_control *mux, unsigned int state)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (mux->in_use)
|
||||
return -EBUSY;
|
||||
|
||||
ret = __mux_control_select(mux, state);
|
||||
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
mux->in_use = true;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mux_control_deselect(struct mux_control *mux)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (mux->idle_state != MUX_IDLE_AS_IS &&
|
||||
mux->idle_state != mux->cached_state)
|
||||
ret = mux_control_set(mux, mux->idle_state);
|
||||
|
||||
mux->in_use = false;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int mux_of_xlate_default(struct mux_chip *mux_chip,
|
||||
struct ofnode_phandle_args *args,
|
||||
struct mux_control **muxp)
|
||||
{
|
||||
struct mux_control *mux;
|
||||
int id;
|
||||
|
||||
log_debug("%s(muxp=%p)\n", __func__, muxp);
|
||||
|
||||
if (args->args_count > 1) {
|
||||
debug("Invaild args_count: %d\n", args->args_count);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (args->args_count)
|
||||
id = args->args[0];
|
||||
else
|
||||
id = 0;
|
||||
|
||||
if (id >= mux_chip->controllers) {
|
||||
pr_err("bad mux controller %u specified in %s\n",
|
||||
id, ofnode_get_name(args->node));
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
mux = &mux_chip->mux[id];
|
||||
mux->id = id;
|
||||
*muxp = mux;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* mux_get_by_indexed_prop() - Get a mux control by integer index
|
||||
* @dev: The client device.
|
||||
* @prop_name: Name of the device tree property.
|
||||
* @index: The index of the mux to get
|
||||
* @mux: A pointer to the 'mux_control' struct to initialize.
|
||||
*
|
||||
* Return: 0 of OK, -errno otherwise.
|
||||
*/
|
||||
static int mux_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
|
||||
int index, struct mux_control **mux)
|
||||
{
|
||||
int ret;
|
||||
struct ofnode_phandle_args args;
|
||||
struct udevice *dev_mux;
|
||||
const struct mux_control_ops *ops;
|
||||
struct mux_chip *mux_chip;
|
||||
|
||||
log_debug("%s(dev=%p, index=%d, mux=%p)\n", __func__, dev, index, mux);
|
||||
|
||||
ret = dev_read_phandle_with_args(dev, prop_name, "#mux-control-cells",
|
||||
0, index, &args);
|
||||
if (ret) {
|
||||
debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
|
||||
__func__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = uclass_get_device_by_ofnode(UCLASS_MUX, args.node, &dev_mux);
|
||||
if (ret) {
|
||||
debug("%s: uclass_get_device_by_ofnode failed: err=%d\n",
|
||||
__func__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
mux_chip = dev_get_uclass_priv(dev_mux);
|
||||
|
||||
ops = mux_dev_ops(dev_mux);
|
||||
if (ops->of_xlate)
|
||||
ret = ops->of_xlate(mux_chip, &args, mux);
|
||||
else
|
||||
ret = mux_of_xlate_default(mux_chip, &args, mux);
|
||||
if (ret) {
|
||||
debug("of_xlate() failed: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
(*mux)->dev = dev_mux;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mux_get_by_index(struct udevice *dev, int index, struct mux_control **mux)
|
||||
{
|
||||
return mux_get_by_indexed_prop(dev, "mux-controls", index, mux);
|
||||
}
|
||||
|
||||
int mux_control_get(struct udevice *dev, const char *name,
|
||||
struct mux_control **mux)
|
||||
{
|
||||
int index;
|
||||
|
||||
debug("%s(dev=%p, name=%s, mux=%p)\n", __func__, dev, name, mux);
|
||||
|
||||
index = dev_read_stringlist_search(dev, "mux-control-names", name);
|
||||
if (index < 0) {
|
||||
debug("fdt_stringlist_search() failed: %d\n", index);
|
||||
return index;
|
||||
}
|
||||
|
||||
return mux_get_by_index(dev, index, mux);
|
||||
}
|
||||
|
||||
void mux_control_put(struct mux_control *mux)
|
||||
{
|
||||
mux_control_deselect(mux);
|
||||
}
|
||||
|
||||
/**
|
||||
* devm_mux_control_release() - Release the given managed mux.
|
||||
* @dev: The client device.
|
||||
* @res: Pointer to the mux to be released.
|
||||
*
|
||||
* This function is called by devres to release the mux. It reverses the
|
||||
* effects of mux_control_get().
|
||||
*/
|
||||
static void devm_mux_control_release(struct udevice *dev, void *res)
|
||||
{
|
||||
mux_control_put(*(struct mux_control **)res);
|
||||
}
|
||||
|
||||
struct mux_control *devm_mux_control_get(struct udevice *dev, const char *id)
|
||||
{
|
||||
int rc;
|
||||
struct mux_control **mux;
|
||||
|
||||
mux = devres_alloc(devm_mux_control_release,
|
||||
sizeof(struct mux_control *), __GFP_ZERO);
|
||||
if (unlikely(!mux))
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
rc = mux_control_get(dev, id, mux);
|
||||
if (rc)
|
||||
return ERR_PTR(rc);
|
||||
|
||||
devres_add(dev, mux);
|
||||
return *mux;
|
||||
}
|
||||
|
||||
int mux_alloc_controllers(struct udevice *dev, unsigned int controllers)
|
||||
{
|
||||
int i;
|
||||
struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
|
||||
|
||||
mux_chip->mux = devm_kmalloc(dev,
|
||||
sizeof(struct mux_control) * controllers,
|
||||
__GFP_ZERO);
|
||||
if (!mux_chip->mux)
|
||||
return -ENOMEM;
|
||||
|
||||
mux_chip->controllers = controllers;
|
||||
|
||||
for (i = 0; i < mux_chip->controllers; ++i) {
|
||||
struct mux_control *mux = &mux_chip->mux[i];
|
||||
|
||||
mux->dev = dev;
|
||||
mux->cached_state = MUX_CACHE_UNKNOWN;
|
||||
mux->idle_state = MUX_IDLE_AS_IS;
|
||||
mux->in_use = false;
|
||||
mux->id = i;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mux_uclass_post_probe(struct udevice *dev)
|
||||
{
|
||||
int i, ret;
|
||||
struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
|
||||
|
||||
/* Set all mux controllers to their idle state. */
|
||||
for (i = 0; i < mux_chip->controllers; ++i) {
|
||||
struct mux_control *mux = &mux_chip->mux[i];
|
||||
|
||||
if (mux->idle_state == mux->cached_state)
|
||||
continue;
|
||||
|
||||
ret = mux_control_set(mux, mux->idle_state);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "unable to set idle state\n");
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
UCLASS_DRIVER(mux) = {
|
||||
.id = UCLASS_MUX,
|
||||
.name = "mux",
|
||||
.post_probe = mux_uclass_post_probe,
|
||||
.per_device_auto_alloc_size = sizeof(struct mux_chip),
|
||||
};
|
||||
|
|
@ -71,6 +71,7 @@ enum uclass_id {
|
|||
UCLASS_MMC, /* SD / MMC card or chip */
|
||||
UCLASS_MOD_EXP, /* RSA Mod Exp device */
|
||||
UCLASS_MTD, /* Memory Technology Device (MTD) device */
|
||||
UCLASS_MUX, /* Multiplexer device */
|
||||
UCLASS_NOP, /* No-op devices */
|
||||
UCLASS_NORTHBRIDGE, /* Intel Northbridge / SDRAM controller */
|
||||
UCLASS_NVME, /* NVM Express device */
|
||||
|
|
|
|||
17
include/dt-bindings/mux/mux.h
Normal file
17
include/dt-bindings/mux/mux.h
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* This header provides constants for most Multiplexer bindings.
|
||||
*
|
||||
* Most Multiplexer bindings specify an idle state. In most cases, the
|
||||
* the multiplexer can be left as is when idle, and in some cases it can
|
||||
* disconnect the input/output and leave the multiplexer in a high
|
||||
* impedance state.
|
||||
*/
|
||||
|
||||
#ifndef _DT_BINDINGS_MUX_MUX_H
|
||||
#define _DT_BINDINGS_MUX_MUX_H
|
||||
|
||||
#define MUX_IDLE_AS_IS (-1)
|
||||
#define MUX_IDLE_DISCONNECT (-2)
|
||||
|
||||
#endif
|
||||
109
include/mux-internal.h
Normal file
109
include/mux-internal.h
Normal file
|
|
@ -0,0 +1,109 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||
/*
|
||||
* Based on the linux multiplexer framework
|
||||
*
|
||||
* Copyright (C) 2017 Axentia Technologies AB
|
||||
* Author: Peter Rosin <peda@axentia.se>
|
||||
*
|
||||
* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
|
||||
* Jean-Jacques Hiblot <jjhiblot@ti.com>
|
||||
*/
|
||||
|
||||
#ifndef _MUX_INTERNAL_H
|
||||
#define _MUX_INTERNAL_H
|
||||
|
||||
/* See mux.h for background documentation. */
|
||||
|
||||
struct ofnode_phandle_args;
|
||||
|
||||
/**
|
||||
* struct mux_chip - Represents a chip holding mux controllers.
|
||||
* @controllers: Number of mux controllers handled by the chip.
|
||||
* @mux: Array of mux controllers that are handled.
|
||||
*
|
||||
* This a per-device uclass-private data.
|
||||
*/
|
||||
struct mux_chip {
|
||||
unsigned int controllers;
|
||||
struct mux_control *mux;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct mux_control_ops - Mux controller operations for a mux chip.
|
||||
* @set: Set the state of the given mux controller.
|
||||
*/
|
||||
struct mux_control_ops {
|
||||
/**
|
||||
* set - Apply a state to a multiplexer control
|
||||
*
|
||||
* @mux: A multiplexer control
|
||||
* @return 0 if OK, or a negative error code.
|
||||
*/
|
||||
int (*set)(struct mux_control *mux, int state);
|
||||
|
||||
/**
|
||||
* of_xlate - Translate a client's device-tree (OF) multiplexer
|
||||
* specifier.
|
||||
*
|
||||
* If this function pointer is set to NULL, the multiplexer core will
|
||||
* use a default implementation, which assumes #mux-control-cells = <1>
|
||||
* and that the DT cell contains a simple integer channel ID.
|
||||
*
|
||||
* @dev_mux: The multiplexer device. A single device may handle
|
||||
* several multiplexer controls.
|
||||
* @args: The multiplexer specifier values from device tree.
|
||||
* @muxp: (out) A multiplexer control
|
||||
* @return 0 if OK, or a negative error code.
|
||||
*/
|
||||
int (*of_xlate)(struct mux_chip *dev_mux,
|
||||
struct ofnode_phandle_args *args,
|
||||
struct mux_control **muxp);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct mux_control - Represents a mux controller.
|
||||
* @in_use: Whether the mux controller is in use or not.
|
||||
* @dev: The client device.
|
||||
* @cached_state: The current mux controller state, or -1 if none.
|
||||
* @states: The number of mux controller states.
|
||||
* @idle_state: The mux controller state to use when inactive, or one
|
||||
* of MUX_IDLE_AS_IS and MUX_IDLE_DISCONNECT.
|
||||
* @id: The index of the mux controller within the mux chip
|
||||
* it is a part of.
|
||||
*
|
||||
* Mux drivers may only change @states and @idle_state, and may only do so
|
||||
* between allocation and registration of the mux controller. Specifically,
|
||||
* @cached_state is internal to the mux core and should never be written by
|
||||
* mux drivers.
|
||||
*/
|
||||
struct mux_control {
|
||||
bool in_use;
|
||||
struct udevice *dev;
|
||||
int cached_state;
|
||||
unsigned int states;
|
||||
int idle_state;
|
||||
int id;
|
||||
};
|
||||
|
||||
/**
|
||||
* mux_control_get_index() - Get the index of the given mux controller
|
||||
* @mux: The mux-control to get the index for.
|
||||
*
|
||||
* Return: The index of the mux controller within the mux chip the mux
|
||||
* controller is a part of.
|
||||
*/
|
||||
static inline unsigned int mux_control_get_index(struct mux_control *mux)
|
||||
{
|
||||
return mux->id;
|
||||
}
|
||||
|
||||
/**
|
||||
* mux_alloc_controllers() - Allocate the given number of mux controllers.
|
||||
* @dev: The client device.
|
||||
* controllers: Number of controllers to allocate.
|
||||
*
|
||||
* Return: 0 of OK, -errno otherwise.
|
||||
*/
|
||||
int mux_alloc_controllers(struct udevice *dev, unsigned int controllers);
|
||||
|
||||
#endif
|
||||
147
include/mux.h
Normal file
147
include/mux.h
Normal file
|
|
@ -0,0 +1,147 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||
/*
|
||||
* Based on the linux multiplexer framework
|
||||
*
|
||||
* At its core, a multiplexer (or mux), also known as a data selector, is a
|
||||
* device that selects between several analog or digital input signals and
|
||||
* forwards it to a single output line. This notion can be extended to work
|
||||
* with buses, like a I2C bus multiplexer for example.
|
||||
*
|
||||
* Copyright (C) 2017 Axentia Technologies AB
|
||||
* Author: Peter Rosin <peda@axentia.se>
|
||||
*
|
||||
* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
|
||||
* Jean-Jacques Hiblot <jjhiblot@ti.com>
|
||||
*/
|
||||
|
||||
#ifndef _MUX_H_
|
||||
#define _MUX_H_
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
struct udevice;
|
||||
struct mux_control;
|
||||
|
||||
#if CONFIG_IS_ENABLED(MULTIPLEXER)
|
||||
/**
|
||||
* mux_control_states() - Query the number of multiplexer states.
|
||||
* @mux: The mux-control to query.
|
||||
*
|
||||
* Return: The number of multiplexer states.
|
||||
*/
|
||||
unsigned int mux_control_states(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* mux_control_select() - Select the given multiplexer state.
|
||||
* @mux: The mux-control to request a change of state from.
|
||||
* @state: The new requested state.
|
||||
*
|
||||
* On successfully selecting the mux-control state, it will be locked until
|
||||
* there is a call to mux_control_deselect(). If the mux-control is already
|
||||
* selected when mux_control_select() is called, the function will indicate
|
||||
* -EBUSY
|
||||
*
|
||||
* Therefore, make sure to call mux_control_deselect() when the operation is
|
||||
* complete and the mux-control is free for others to use, but do not call
|
||||
* mux_control_deselect() if mux_control_select() fails.
|
||||
*
|
||||
* Return: 0 when the mux-control state has the requested state or a negative
|
||||
* errno on error.
|
||||
*/
|
||||
int __must_check mux_control_select(struct mux_control *mux,
|
||||
unsigned int state);
|
||||
#define mux_control_try_select(mux) mux_control_select(mux)
|
||||
|
||||
/**
|
||||
* mux_control_deselect() - Deselect the previously selected multiplexer state.
|
||||
* @mux: The mux-control to deselect.
|
||||
*
|
||||
* It is required that a single call is made to mux_control_deselect() for
|
||||
* each and every successful call made to either of mux_control_select() or
|
||||
* mux_control_try_select().
|
||||
*
|
||||
* Return: 0 on success and a negative errno on error. An error can only
|
||||
* occur if the mux has an idle state. Note that even if an error occurs, the
|
||||
* mux-control is unlocked and is thus free for the next access.
|
||||
*/
|
||||
int mux_control_deselect(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* mux_get_by_index() = Get a mux by integer index.
|
||||
* @dev: The client device.
|
||||
* @index: The index of the mux to get.
|
||||
* @mux: A pointer to the 'mux_control' struct to initialize.
|
||||
*
|
||||
* This looks up and initializes a mux. The index is relative to the client
|
||||
* device.
|
||||
*
|
||||
* Return: 0 if OK, or a negative error code.
|
||||
*/
|
||||
int mux_get_by_index(struct udevice *dev, int index, struct mux_control **mux);
|
||||
|
||||
/**
|
||||
* mux_control_get() - Get the mux-control for a device.
|
||||
* @dev: The device that needs a mux-control.
|
||||
* @mux_name: The name identifying the mux-control.
|
||||
* @mux: A pointer to the mux-control pointer.
|
||||
*
|
||||
* Return: 0 of OK, or a negative error code.
|
||||
*/
|
||||
int mux_control_get(struct udevice *dev, const char *name,
|
||||
struct mux_control **mux);
|
||||
|
||||
/**
|
||||
* mux_control_put() - Put away the mux-control for good.
|
||||
* @mux: The mux-control to put away.
|
||||
*
|
||||
* mux_control_put() reverses the effects of mux_control_get().
|
||||
*/
|
||||
void mux_control_put(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* devm_mux_control_get() - Get the mux-control for a device, with resource
|
||||
* management.
|
||||
* @dev: The device that needs a mux-control.
|
||||
* @mux_name: The name identifying the mux-control.
|
||||
*
|
||||
* Return: Pointer to the mux-control, or an ERR_PTR with a negative errno.
|
||||
*/
|
||||
struct mux_control *devm_mux_control_get(struct udevice *dev,
|
||||
const char *mux_name);
|
||||
#else
|
||||
unsigned int mux_control_states(struct mux_control *mux)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
int __must_check mux_control_select(struct mux_control *mux,
|
||||
unsigned int state)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
#define mux_control_try_select(mux) mux_control_select(mux)
|
||||
|
||||
int mux_control_deselect(struct mux_control *mux)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
struct mux_control *mux_control_get(struct udevice *dev, const char *mux_name)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void mux_control_put(struct mux_control *mux)
|
||||
{
|
||||
}
|
||||
|
||||
struct mux_control *devm_mux_control_get(struct udevice *dev,
|
||||
const char *mux_name)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue