mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-22 09:58:52 +09:00
![Jean-Jacques Hiblot](/assets/img/avatar_default.png)
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>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* 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
|