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