linux/drivers/reset/reset-scmi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ARM System Control and Management Interface (ARM SCMI) reset driver
 *
 * Copyright (C) 2019-2021 ARM Ltd.
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/device.h>
#include <linux/reset-controller.h>
#include <linux/scmi_protocol.h>

static const struct scmi_reset_proto_ops *reset_ops;

/**
 * struct scmi_reset_data - reset controller information structure
 * @rcdev: reset controller entity
 * @ph: ARM SCMI protocol handle used for communication with system controller
 */
struct scmi_reset_data { … };

#define to_scmi_reset_data(p) …
#define to_scmi_handle(p) …

/**
 * scmi_reset_assert() - assert device reset
 * @rcdev: reset controller entity
 * @id: ID of the reset to be asserted
 *
 * This function implements the reset driver op to assert a device's reset
 * using the ARM SCMI protocol.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int
scmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
{ … }

/**
 * scmi_reset_deassert() - deassert device reset
 * @rcdev: reset controller entity
 * @id: ID of the reset to be deasserted
 *
 * This function implements the reset driver op to deassert a device's reset
 * using the ARM SCMI protocol.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int
scmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{ … }

/**
 * scmi_reset_reset() - reset the device
 * @rcdev: reset controller entity
 * @id: ID of the reset signal to be reset(assert + deassert)
 *
 * This function implements the reset driver op to trigger a device's
 * reset signal using the ARM SCMI protocol.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int
scmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
{ … }

static const struct reset_control_ops scmi_reset_ops = …;

static int scmi_reset_probe(struct scmi_device *sdev)
{ … }

static const struct scmi_device_id scmi_id_table[] = …;
MODULE_DEVICE_TABLE(scmi, scmi_id_table);

static struct scmi_driver scmi_reset_driver = …;
module_scmi_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;