mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
e7012e6e1f
Add a reset operations function pointer to support querying the current status of a reset control. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (c) 2016, NVIDIA CORPORATION.
|
|
*/
|
|
|
|
#ifndef _RESET_UCLASS_H
|
|
#define _RESET_UCLASS_H
|
|
|
|
/* See reset.h for background documentation. */
|
|
|
|
#include <reset.h>
|
|
|
|
struct ofnode_phandle_args;
|
|
struct udevice;
|
|
|
|
/**
|
|
* struct reset_ops - The functions that a reset controller driver must
|
|
* implement.
|
|
*/
|
|
struct reset_ops {
|
|
/**
|
|
* of_xlate - Translate a client's device-tree (OF) reset specifier.
|
|
*
|
|
* The reset core calls this function as the first step in implementing
|
|
* a client's reset_get_by_*() call.
|
|
*
|
|
* If this function pointer is set to NULL, the reset core will use a
|
|
* default implementation, which assumes #reset-cells = <1>, and that
|
|
* the DT cell contains a simple integer reset signal ID.
|
|
*
|
|
* At present, the reset API solely supports device-tree. If this
|
|
* changes, other xxx_xlate() functions may be added to support those
|
|
* other mechanisms.
|
|
*
|
|
* @reset_ctl: The reset control struct to hold the translation result.
|
|
* @args: The reset specifier values from device tree.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*of_xlate)(struct reset_ctl *reset_ctl,
|
|
struct ofnode_phandle_args *args);
|
|
/**
|
|
* request - Request a translated reset control.
|
|
*
|
|
* The reset core calls this function as the second step in
|
|
* implementing a client's reset_get_by_*() call, following a
|
|
* successful xxx_xlate() call.
|
|
*
|
|
* @reset_ctl: The reset control struct to request; this has been
|
|
* filled in by a previoux xxx_xlate() function call.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*request)(struct reset_ctl *reset_ctl);
|
|
/**
|
|
* free - Free a previously requested reset control.
|
|
*
|
|
* This is the implementation of the client reset_free() API.
|
|
*
|
|
* @reset_ctl: The reset control to free.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*free)(struct reset_ctl *reset_ctl);
|
|
/**
|
|
* rst_assert - Assert a reset signal.
|
|
*
|
|
* Note: This function is named rst_assert not assert to avoid
|
|
* conflicting with global macro assert().
|
|
*
|
|
* @reset_ctl: The reset signal to assert.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*rst_assert)(struct reset_ctl *reset_ctl);
|
|
/**
|
|
* rst_deassert - Deassert a reset signal.
|
|
*
|
|
* @reset_ctl: The reset signal to deassert.
|
|
* @return 0 if OK, or a negative error code.
|
|
*/
|
|
int (*rst_deassert)(struct reset_ctl *reset_ctl);
|
|
/**
|
|
* rst_status - Check reset signal status.
|
|
*
|
|
* @reset_ctl: The reset signal to check.
|
|
* @return 0 if deasserted, positive if asserted, or a negative
|
|
* error code.
|
|
*/
|
|
int (*rst_status)(struct reset_ctl *reset_ctl);
|
|
};
|
|
|
|
#endif
|