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drivers: Add a new framework for multiplexer devices

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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
2020-10-16 16:16:30 +05:30
committed by Tom Rini
parent 39dd7c1d6b
commit 0ad40b2463
9 changed files with 606 additions and 0 deletions
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include/mux-internal.h Normal file
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/* 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