alistair23-linux/include/linux/reset.h

#ifndef _LINUX_RESET_H_
#define _LINUX_RESET_H_

#include <linux/device.h>

struct reset_control;

#ifdef CONFIG_RESET_CONTROLLER

int reset_control_reset(struct reset_control *rstc);
int reset_control_assert(struct reset_control *rstc);
int reset_control_deassert(struct reset_control *rstc);
int reset_control_status(struct reset_control *rstc);

struct reset_control *__of_reset_control_get(struct device_node *node,
					     const char *id, int index);
void reset_control_put(struct reset_control *rstc);
struct reset_control *__devm_reset_control_get(struct device *dev,
					       const char *id, int index);

int __must_check device_reset(struct device *dev);

static inline int device_reset_optional(struct device *dev)
{
	return device_reset(dev);
}

#else

static inline int reset_control_reset(struct reset_control *rstc)
{
	WARN_ON(1);
	return 0;
}

static inline int reset_control_assert(struct reset_control *rstc)
{
	WARN_ON(1);
	return 0;
}

static inline int reset_control_deassert(struct reset_control *rstc)
{
	WARN_ON(1);
	return 0;
}

static inline int reset_control_status(struct reset_control *rstc)
{
	WARN_ON(1);
	return 0;
}

static inline void reset_control_put(struct reset_control *rstc)
{
	WARN_ON(1);
}

static inline int device_reset_optional(struct device *dev)
{
	return -ENOTSUPP;
}

static inline struct reset_control *__of_reset_control_get(
					struct device_node *node,
					const char *id, int index)
{
	return ERR_PTR(-EINVAL);
}

static inline struct reset_control *__devm_reset_control_get(
					struct device *dev,
					const char *id, int index)
{
	return ERR_PTR(-EINVAL);
}

#endif /* CONFIG_RESET_CONTROLLER */

/**
 * reset_control_get - Lookup and obtain a reference to a reset controller.
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *__must_check reset_control_get(
					struct device *dev, const char *id)
{
#ifndef CONFIG_RESET_CONTROLLER
	WARN_ON(1);
#endif
	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0);
}

static inline struct reset_control *reset_control_get_optional(
					struct device *dev, const char *id)
{
	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0);
}

/**
 * of_reset_control_get - Lookup and obtain a reference to a reset controller.
 * @node: device to be reset by the controller
 * @id: reset line name
 *
 * Returns a struct reset_control or IS_ERR() condition containing errno.
 *
 * Use of id names is optional.
 */
static inline struct reset_control *of_reset_control_get(
				struct device_node *node, const char *id)
{
	return __of_reset_control_get(node, id, 0);
}

/**
 * of_reset_control_get_by_index - Lookup and obtain a reference to a reset
 * controller by index.
 * @node: device to be reset by the controller
 * @index: index of the reset controller
 *
 * This is to be used to perform a list of resets for a device or power domain
 * in whatever order. Returns a struct reset_control or IS_ERR() condition
 * containing errno.
 */
static inline struct reset_control *of_reset_control_get_by_index(
					struct device_node *node, int index)
{
	return __of_reset_control_get(node, NULL, index);
}

/**
 * devm_reset_control_get - resource managed reset_control_get()
 * @dev: device to be reset by the controller
 * @id: reset line name
 *
 * Managed reset_control_get(). For reset controllers returned from this
 * function, reset_control_put() is called automatically on driver detach.
 * See reset_control_get() for more information.
 */
static inline struct reset_control *__must_check devm_reset_control_get(
					struct device *dev, const char *id)
{
#ifndef CONFIG_RESET_CONTROLLER
	WARN_ON(1);
#endif
	return __devm_reset_control_get(dev, id, 0);
}

static inline struct reset_control *devm_reset_control_get_optional(
					struct device *dev, const char *id)
{
	return __devm_reset_control_get(dev, id, 0);
}

/**
 * devm_reset_control_get_by_index - resource managed reset_control_get
 * @dev: device to be reset by the controller
 * @index: index of the reset controller
 *
 * Managed reset_control_get(). For reset controllers returned from this
 * function, reset_control_put() is called automatically on driver detach.
 * See reset_control_get() for more information.
 */
static inline struct reset_control *devm_reset_control_get_by_index(
					struct device *dev, int index)
{
	return __devm_reset_control_get(dev, NULL, index);
}

#endif