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reset: add of_reset_control_get_by_index()

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Add of_reset_control_get_by_index() to allow the drivers to get reset
device without knowing its name.

Signed-off-by: Vince Hsu <vinceh@nvidia.com>
[jonathanh@nvidia.com: Updated stub function to return -ENOTSUPP instead
 of -ENOSYS which should only be used for system calls.]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Vince Hsu 2015-07-13 13:39:39 +01:00 committed by Philipp Zabel
parent 8005c49d9a
commit c0a13aa6da
2 changed files with 38 additions and 11 deletions
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40
drivers/reset/core.c
View File

@ -141,27 +141,24 @@ int reset_control_status(struct reset_control *rstc)
EXPORT_SYMBOL_GPL(reset_control_status);
/**
* of_reset_control_get - Lookup and obtain a reference to a reset controller.
* 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
* @id: reset line name
* @index: index of the reset controller
*
* Returns a struct reset_control or IS_ERR() condition containing errno.
*
* Use of id names is optional.
* 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.
*/
struct reset_control *of_reset_control_get(struct device_node *node,
const char *id)
struct reset_control *of_reset_control_get_by_index(struct device_node *node,
int index)
{
struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
struct reset_controller_dev *r, *rcdev;
struct of_phandle_args args;
int index = 0;
int rstc_id;
int ret;
if (id)
index = of_property_match_string(node,
"reset-names", id);
ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
index, &args);
if (ret)
@ -202,6 +199,27 @@ struct reset_control *of_reset_control_get(struct device_node *node,
return rstc;
}
EXPORT_SYMBOL_GPL(of_reset_control_get_by_index);
/**
* 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 *of_reset_control_get(struct device_node *node,
const char *id)
{
int index = 0;
if (id)
index = of_property_match_string(node,
"reset-names", id);
return of_reset_control_get_by_index(node, index);
}
EXPORT_SYMBOL_GPL(of_reset_control_get);
/**

9
include/linux/reset.h
View File

@ -38,6 +38,9 @@ static inline struct reset_control *devm_reset_control_get_optional(
struct reset_control *of_reset_control_get(struct device_node *node,
const char *id);
struct reset_control *of_reset_control_get_by_index(
struct device_node *node, int index);
#else
static inline int reset_control_reset(struct reset_control *rstc)
@ -106,6 +109,12 @@ static inline struct reset_control *of_reset_control_get(
return ERR_PTR(-ENOSYS);
}
static inline struct reset_control *of_reset_control_get_by_index(
struct device_node *node, int index)
{
return ERR_PTR(-ENOTSUPP);
}
#endif /* CONFIG_RESET_CONTROLLER */
#endif