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Merge branch 'reset/for_v3.15' of git://git.pengutronix.de/git/pza/linux into next/drivers 

Merge "reset controller fixes and updates" from Philipp Zabel:

* 'reset/for_v3.15' of git://git.pengutronix.de/git/pza/linux:
  reset: Add optional resets and stubs
  reset: Add of_reset_control_get
  reset: Mark function as static and remove unused function in core.c
  reset: allow drivers to request probe deferral

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
hifive-unleashed-5.1
Arnd Bergmann 2014-03-27 01:28:19 +01:00
parent b80a6373d6 b424080a9e
commit 463e8474af
2 changed files with 96 additions and 40 deletions
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71
drivers/reset/core.c
View File

@ -43,7 +43,7 @@ struct reset_control {
* This simple translation function should be used for reset controllers
* with 1:1 mapping, where reset lines can be indexed by number without gaps.
*/
int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
static int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
@ -54,7 +54,6 @@ int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
return reset_spec->args[0];
}
EXPORT_SYMBOL_GPL(of_reset_simple_xlate);
/**
* reset_controller_register - register a reset controller device
@ -127,15 +126,16 @@ int reset_control_deassert(struct reset_control *rstc)
EXPORT_SYMBOL_GPL(reset_control_deassert);
/**
* reset_control_get - Lookup and obtain a reference to a reset controller.
* @dev: device to be reset by the controller
* 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.
*/
struct reset_control *reset_control_get(struct device *dev, const char *id)
struct reset_control *of_reset_control_get(struct device_node *node,
const char *id)
{
struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
struct reset_controller_dev *r, *rcdev;
@ -144,13 +144,10 @@ struct reset_control *reset_control_get(struct device *dev, const char *id)
int rstc_id;
int ret;
if (!dev)
return ERR_PTR(-EINVAL);
if (id)
index = of_property_match_string(dev->of_node,
index = of_property_match_string(node,
"reset-names", id);
ret = of_parse_phandle_with_args(dev->of_node, "resets", "#reset-cells",
ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
index, &args);
if (ret)
return ERR_PTR(ret);
@ -167,7 +164,7 @@ struct reset_control *reset_control_get(struct device *dev, const char *id)
if (!rcdev) {
mutex_unlock(&reset_controller_list_mutex);
return ERR_PTR(-ENODEV);
return ERR_PTR(-EPROBE_DEFER);
}
rstc_id = rcdev->of_xlate(rcdev, &args);
@ -185,12 +182,35 @@ struct reset_control *reset_control_get(struct device *dev, const char *id)
return ERR_PTR(-ENOMEM);
}
rstc->dev = dev;
rstc->rcdev = rcdev;
rstc->id = rstc_id;
return rstc;
}
EXPORT_SYMBOL_GPL(of_reset_control_get);
/**
* 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.
*/
struct reset_control *reset_control_get(struct device *dev, const char *id)
{
struct reset_control *rstc;
if (!dev)
return ERR_PTR(-EINVAL);
rstc = of_reset_control_get(dev->of_node, id);
if (!IS_ERR(rstc))
rstc->dev = dev;
return rstc;
}
EXPORT_SYMBOL_GPL(reset_control_get);
/**
@ -243,33 +263,6 @@ struct reset_control *devm_reset_control_get(struct device *dev, const char *id)
}
EXPORT_SYMBOL_GPL(devm_reset_control_get);
static int devm_reset_control_match(struct device *dev, void *res, void *data)
{
struct reset_control **rstc = res;
if (WARN_ON(!rstc || !*rstc))
return 0;
return *rstc == data;
}
/**
* devm_reset_control_put - resource managed reset_control_put()
* @rstc: reset controller to free
*
* Deallocate a reset control allocated withd devm_reset_control_get().
* This function will not need to be called normally, as devres will take
* care of freeing the resource.
*/
void devm_reset_control_put(struct reset_control *rstc)
{
int ret;
ret = devres_release(rstc->dev, devm_reset_control_release,
devm_reset_control_match, rstc);
if (ret)
WARN_ON(ret);
}
EXPORT_SYMBOL_GPL(devm_reset_control_put);
/**
* device_reset - find reset controller associated with the device
* and perform reset

65
include/linux/reset.h
View File

@ -4,6 +4,8 @@
struct device;
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);
@ -12,6 +14,67 @@ struct reset_control *reset_control_get(struct device *dev, const char *id);
void reset_control_put(struct reset_control *rstc);
struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
int device_reset(struct device *dev);
int __must_check device_reset(struct device *dev);
static inline int device_reset_optional(struct device *dev)
{
return device_reset(dev);
}
static inline struct reset_control *reset_control_get_optional(
struct device *dev, const char *id)
{
return reset_control_get(dev, id);
}
static inline struct reset_control *devm_reset_control_get_optional(
struct device *dev, const char *id)
{
return devm_reset_control_get(dev, id);
}
#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 void reset_control_put(struct reset_control *rstc)
{
WARN_ON(1);
}
static inline int device_reset_optional(struct device *dev)
{
return -ENOSYS;
}
static inline struct reset_control *reset_control_get_optional(
struct device *dev, const char *id)
{
return ERR_PTR(-ENOSYS);
}
static inline struct reset_control *devm_reset_control_get_optional(
struct device *dev, const char *id)
{
return ERR_PTR(-ENOSYS);
}
#endif /* CONFIG_RESET_CONTROLLER */
#endif