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reset: Add reset_control_bulk API

Browse source 
Follow the clock and regulator subsystems' lead and add a bulk API
for reset controls.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210314154459.15375-5-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Philipp Zabel 2021-03-14 18:44:46 +03:00 committed by Mark Brown
parent 0bbcecaaab
commit 48d7139589
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
2 changed files with 530 additions and 0 deletions
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215
drivers/reset/core.c
View file

@ -358,6 +358,30 @@ int reset_control_reset(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_reset);
/**
* reset_control_bulk_reset - reset the controlled devices in order
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*
* Issue a reset on all provided reset controls, in order.
*
* See also: reset_control_reset()
*/
int reset_control_bulk_reset(int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
int ret, i;
for (i = 0; i < num_rstcs; i++) {
ret = reset_control_reset(rstcs[i].rstc);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(reset_control_bulk_reset);
/**
* reset_control_rearm - allow shared reset line to be re-triggered"
* @rstc: reset controller
@ -461,6 +485,36 @@ int reset_control_assert(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_assert);
/**
* reset_control_bulk_assert - asserts the reset lines in order
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*
* Assert the reset lines for all provided reset controls, in order.
* If an assertion fails, already asserted resets are deasserted again.
*
* See also: reset_control_assert()
*/
int reset_control_bulk_assert(int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
int ret, i;
for (i = 0; i < num_rstcs; i++) {
ret = reset_control_assert(rstcs[i].rstc);
if (ret)
goto err;
}
return 0;
err:
while (i--)
reset_control_deassert(rstcs[i].rstc);
return ret;
}
EXPORT_SYMBOL_GPL(reset_control_bulk_assert);
/**
* reset_control_deassert - deasserts the reset line
* @rstc: reset controller
@ -511,6 +565,36 @@ int reset_control_deassert(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_deassert);
/**
* reset_control_bulk_deassert - deasserts the reset lines in reverse order
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*
* Deassert the reset lines for all provided reset controls, in reverse order.
* If a deassertion fails, already deasserted resets are asserted again.
*
* See also: reset_control_deassert()
*/
int reset_control_bulk_deassert(int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
int ret, i;
for (i = num_rstcs - 1; i >= 0; i--) {
ret = reset_control_deassert(rstcs[i].rstc);
if (ret)
goto err;
}
return 0;
err:
while (i < num_rstcs)
reset_control_assert(rstcs[i++].rstc);
return ret;
}
EXPORT_SYMBOL_GPL(reset_control_bulk_deassert);
/**
* reset_control_status - returns a negative errno if not supported, a
* positive value if the reset line is asserted, or zero if the reset
@ -588,6 +672,36 @@ int reset_control_acquire(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_acquire);
/**
* reset_control_bulk_acquire - acquires reset controls for exclusive use
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*
* This is used to explicitly acquire reset controls requested with
* reset_control_bulk_get_exclusive_release() for temporary exclusive use.
*
* See also: reset_control_acquire(), reset_control_bulk_release()
*/
int reset_control_bulk_acquire(int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
int ret, i;
for (i = 0; i < num_rstcs; i++) {
ret = reset_control_acquire(rstcs[i].rstc);
if (ret)
goto err;
}
return 0;
err:
while (i--)
reset_control_release(rstcs[i].rstc);
return ret;
}
EXPORT_SYMBOL_GPL(reset_control_bulk_acquire);
/**
* reset_control_release() - releases exclusive access to a reset control
* @rstc: reset control
@ -610,6 +724,26 @@ void reset_control_release(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_release);
/**
* reset_control_bulk_release() - releases exclusive access to reset controls
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*
* Releases exclusive access right to reset controls previously obtained by a
* call to reset_control_bulk_acquire().
*
* See also: reset_control_release(), reset_control_bulk_acquire()
*/
void reset_control_bulk_release(int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
int i;
for (i = 0; i < num_rstcs; i++)
reset_control_release(rstcs[i].rstc);
}
EXPORT_SYMBOL_GPL(reset_control_bulk_release);
static struct reset_control *__reset_control_get_internal(
struct reset_controller_dev *rcdev,
unsigned int index, bool shared, bool acquired)
@ -814,6 +948,32 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
}
EXPORT_SYMBOL_GPL(__reset_control_get);
int __reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired)
{
int ret, i;
for (i = 0; i < num_rstcs; i++) {
rstcs[i].rstc = __reset_control_get(dev, rstcs[i].id, 0,
shared, optional, acquired);
if (IS_ERR(rstcs[i].rstc)) {
ret = PTR_ERR(rstcs[i].rstc);
goto err;
}
}
return 0;
err:
mutex_lock(&reset_list_mutex);
while (i--)
__reset_control_put_internal(rstcs[i].rstc);
mutex_unlock(&reset_list_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(__reset_control_bulk_get);
static void reset_control_array_put(struct reset_control_array *resets)
{
int i;
@ -845,6 +1005,23 @@ void reset_control_put(struct reset_control *rstc)
}
EXPORT_SYMBOL_GPL(reset_control_put);
/**
* reset_control_bulk_put - free the reset controllers
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset controls set
*/
void reset_control_bulk_put(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
mutex_lock(&reset_list_mutex);
while (num_rstcs--) {
if (IS_ERR_OR_NULL(rstcs[num_rstcs].rstc))
continue;
__reset_control_put_internal(rstcs[num_rstcs].rstc);
}
mutex_unlock(&reset_list_mutex);
}
EXPORT_SYMBOL_GPL(reset_control_bulk_put);
static void devm_reset_control_release(struct device *dev, void *res)
{
reset_control_put(*(struct reset_control **)res);
@ -874,6 +1051,44 @@ struct reset_control *__devm_reset_control_get(struct device *dev,
}
EXPORT_SYMBOL_GPL(__devm_reset_control_get);
struct reset_control_bulk_devres {
int num_rstcs;
struct reset_control_bulk_data *rstcs;
};
static void devm_reset_control_bulk_release(struct device *dev, void *res)
{
struct reset_control_bulk_devres *devres = res;
reset_control_bulk_put(devres->num_rstcs, devres->rstcs);
}
int __devm_reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired)
{
struct reset_control_bulk_devres *ptr;
int ret;
ptr = devres_alloc(devm_reset_control_bulk_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = __reset_control_bulk_get(dev, num_rstcs, rstcs, shared, optional, acquired);
if (ret < 0) {
devres_free(ptr);
return ret;
}
ptr->num_rstcs = num_rstcs;
ptr->rstcs = rstcs;
devres_add(dev, ptr);
return 0;
}
EXPORT_SYMBOL_GPL(__devm_reset_control_bulk_get);
/**
* __device_reset - find reset controller associated with the device
* and perform reset

315
include/linux/reset.h
View file

@ -10,6 +10,21 @@ struct device;
struct device_node;
struct reset_control;
/**
* struct reset_control_bulk_data - Data used for bulk reset control operations.
*
* @id: reset control consumer ID
* @rstc: struct reset_control * to store the associated reset control
*
* The reset APIs provide a series of reset_control_bulk_*() API calls as
* a convenience to consumers which require multiple reset controls.
* This structure is used to manage data for these calls.
*/
struct reset_control_bulk_data {
const char *id;
struct reset_control *rstc;
};
#ifdef CONFIG_RESET_CONTROLLER
int reset_control_reset(struct reset_control *rstc);
@ -20,6 +35,12 @@ int reset_control_status(struct reset_control *rstc);
int reset_control_acquire(struct reset_control *rstc);
void reset_control_release(struct reset_control *rstc);
int reset_control_bulk_reset(int num_rstcs, struct reset_control_bulk_data *rstcs);
int reset_control_bulk_assert(int num_rstcs, struct reset_control_bulk_data *rstcs);
int reset_control_bulk_deassert(int num_rstcs, struct reset_control_bulk_data *rstcs);
int reset_control_bulk_acquire(int num_rstcs, struct reset_control_bulk_data *rstcs);
void reset_control_bulk_release(int num_rstcs, struct reset_control_bulk_data *rstcs);
struct reset_control *__of_reset_control_get(struct device_node *node,
const char *id, int index, bool shared,
bool optional, bool acquired);
@ -27,10 +48,18 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
int index, bool shared,
bool optional, bool acquired);
void reset_control_put(struct reset_control *rstc);
int __reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired);
void reset_control_bulk_put(int num_rstcs, struct reset_control_bulk_data *rstcs);
int __device_reset(struct device *dev, bool optional);
struct reset_control *__devm_reset_control_get(struct device *dev,
const char *id, int index, bool shared,
bool optional, bool acquired);
int __devm_reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired);
struct reset_control *devm_reset_control_array_get(struct device *dev,
bool shared, bool optional);
@ -96,6 +125,48 @@ static inline struct reset_control *__reset_control_get(
return optional ? NULL : ERR_PTR(-ENOTSUPP);
}
static inline int
reset_control_bulk_reset(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
return 0;
}
static inline int
reset_control_bulk_assert(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
return 0;
}
static inline int
reset_control_bulk_deassert(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
return 0;
}
static inline int
reset_control_bulk_acquire(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
return 0;
}
static inline void
reset_control_bulk_release(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
}
static inline int
__reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired)
{
return optional ? 0 : -EOPNOTSUPP;
}
static inline void
reset_control_bulk_put(int num_rstcs, struct reset_control_bulk_data *rstcs)
{
}
static inline struct reset_control *__devm_reset_control_get(
struct device *dev, const char *id,
int index, bool shared, bool optional,
@ -104,6 +175,14 @@ static inline struct reset_control *__devm_reset_control_get(
return optional ? NULL : ERR_PTR(-ENOTSUPP);
}
static inline int
__devm_reset_control_bulk_get(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs,
bool shared, bool optional, bool acquired)
{
return optional ? 0 : -EOPNOTSUPP;
}
static inline struct reset_control *
devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
{
@ -155,6 +234,23 @@ __must_check reset_control_get_exclusive(struct device *dev, const char *id)
return __reset_control_get(dev, id, 0, false, false, true);
}
/**
* reset_control_bulk_get_exclusive - Lookup and obtain exclusive references to
* multiple reset controllers.
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Fills the rstcs array with pointers to exclusive reset controls and
* returns 0, or an IS_ERR() condition containing errno.
*/
static inline int __must_check
reset_control_bulk_get_exclusive(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, false, false, true);
}
/**
* reset_control_get_exclusive_released - Lookup and obtain a temoprarily
* exclusive reference to a reset
@ -176,6 +272,48 @@ __must_check reset_control_get_exclusive_released(struct device *dev,
return __reset_control_get(dev, id, 0, false, false, false);
}
/**
* reset_control_bulk_get_exclusive_released - Lookup and obtain temporarily
* exclusive references to multiple reset
* controllers.
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Fills the rstcs array with pointers to exclusive reset controls and
* returns 0, or an IS_ERR() condition containing errno.
* reset-controls returned by this function must be acquired via
* reset_control_bulk_acquire() before they can be used and should be released
* via reset_control_bulk_release() afterwards.
*/
static inline int __must_check
reset_control_bulk_get_exclusive_released(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, false, false, false);
}
/**
* reset_control_bulk_get_optional_exclusive_released - Lookup and obtain optional
* temporarily exclusive references to multiple
* reset controllers.
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Optional variant of reset_control_bulk_get_exclusive_released(). If the
* requested reset is not specified in the device tree, this function returns 0
* instead of an error and missing rtsc is set to NULL.
*
* See reset_control_bulk_get_exclusive_released() for more information.
*/
static inline int __must_check
reset_control_bulk_get_optional_exclusive_released(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, false, true, false);
}
/**
* reset_control_get_shared - Lookup and obtain a shared reference to a
* reset controller.
@ -204,6 +342,23 @@ static inline struct reset_control *reset_control_get_shared(
return __reset_control_get(dev, id, 0, true, false, false);
}
/**
* reset_control_bulk_get_shared - Lookup and obtain shared references to
* multiple reset controllers.
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Fills the rstcs array with pointers to shared reset controls and
* returns 0, or an IS_ERR() condition containing errno.
*/
static inline int __must_check
reset_control_bulk_get_shared(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, true, false, false);
}
/**
* reset_control_get_optional_exclusive - optional reset_control_get_exclusive()
* @dev: device to be reset by the controller
@ -221,6 +376,26 @@ static inline struct reset_control *reset_control_get_optional_exclusive(
return __reset_control_get(dev, id, 0, false, true, true);
}
/**
* reset_control_bulk_get_optional_exclusive - optional
* reset_control_bulk_get_exclusive()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Optional variant of reset_control_bulk_get_exclusive(). If any of the
* requested resets are not specified in the device tree, this function sets
* them to NULL instead of returning an error.
*
* See reset_control_bulk_get_exclusive() for more information.
*/
static inline int __must_check
reset_control_bulk_get_optional_exclusive(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, false, true, true);
}
/**
* reset_control_get_optional_shared - optional reset_control_get_shared()
* @dev: device to be reset by the controller
@ -238,6 +413,26 @@ static inline struct reset_control *reset_control_get_optional_shared(
return __reset_control_get(dev, id, 0, true, true, false);
}
/**
* reset_control_bulk_get_optional_shared - optional
* reset_control_bulk_get_shared()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Optional variant of reset_control_bulk_get_shared(). If the requested resets
* are not specified in the device tree, this function sets them to NULL
* instead of returning an error.
*
* See reset_control_bulk_get_shared() for more information.
*/
static inline int __must_check
reset_control_bulk_get_optional_shared(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __reset_control_bulk_get(dev, num_rstcs, rstcs, true, true, false);
}
/**
* of_reset_control_get_exclusive - Lookup and obtain an exclusive reference
* to a reset controller.
@ -343,6 +538,26 @@ __must_check devm_reset_control_get_exclusive(struct device *dev,
return __devm_reset_control_get(dev, id, 0, false, false, true);
}
/**
* devm_reset_control_bulk_get_exclusive - resource managed
* reset_control_bulk_get_exclusive()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_get_exclusive(). For reset controllers returned
* from this function, reset_control_put() is called automatically on driver
* detach.
*
* See reset_control_bulk_get_exclusive() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_exclusive(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, false, false, true);
}
/**
* devm_reset_control_get_exclusive_released - resource managed
* reset_control_get_exclusive_released()
@ -362,6 +577,26 @@ __must_check devm_reset_control_get_exclusive_released(struct device *dev,
return __devm_reset_control_get(dev, id, 0, false, false, false);
}
/**
* devm_reset_control_bulk_get_exclusive_released - resource managed
* reset_control_bulk_get_exclusive_released()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_get_exclusive_released(). For reset controllers
* returned from this function, reset_control_put() is called automatically on
* driver detach.
*
* See reset_control_bulk_get_exclusive_released() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_exclusive_released(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, false, false, false);
}
/**
* devm_reset_control_get_optional_exclusive_released - resource managed
* reset_control_get_optional_exclusive_released()
@ -381,6 +616,26 @@ __must_check devm_reset_control_get_optional_exclusive_released(struct device *d
return __devm_reset_control_get(dev, id, 0, false, true, false);
}
/**
* devm_reset_control_bulk_get_optional_exclusive_released - resource managed
* reset_control_bulk_optional_get_exclusive_released()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_optional_get_exclusive_released(). For reset
* controllers returned from this function, reset_control_put() is called
* automatically on driver detach.
*
* See reset_control_bulk_optional_get_exclusive_released() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_optional_exclusive_released(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, false, true, false);
}
/**
* devm_reset_control_get_shared - resource managed reset_control_get_shared()
* @dev: device to be reset by the controller
@ -396,6 +651,26 @@ static inline struct reset_control *devm_reset_control_get_shared(
return __devm_reset_control_get(dev, id, 0, true, false, false);
}
/**
* devm_reset_control_bulk_get_shared - resource managed
* reset_control_bulk_get_shared()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_get_shared(). For reset controllers returned
* from this function, reset_control_put() is called automatically on driver
* detach.
*
* See reset_control_bulk_get_shared() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_shared(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, true, false, false);
}
/**
* devm_reset_control_get_optional_exclusive - resource managed
* reset_control_get_optional_exclusive()
@ -414,6 +689,26 @@ static inline struct reset_control *devm_reset_control_get_optional_exclusive(
return __devm_reset_control_get(dev, id, 0, false, true, true);
}
/**
* devm_reset_control_bulk_get_optional_exclusive - resource managed
* reset_control_bulk_get_optional_exclusive()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_get_optional_exclusive(). For reset controllers
* returned from this function, reset_control_put() is called automatically on
* driver detach.
*
* See reset_control_bulk_get_optional_exclusive() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_optional_exclusive(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, true, false, true);
}
/**
* devm_reset_control_get_optional_shared - resource managed
* reset_control_get_optional_shared()
@ -432,6 +727,26 @@ static inline struct reset_control *devm_reset_control_get_optional_shared(
return __devm_reset_control_get(dev, id, 0, true, true, false);
}
/**
* devm_reset_control_bulk_get_optional_shared - resource managed
* reset_control_bulk_get_optional_shared()
* @dev: device to be reset by the controller
* @num_rstcs: number of entries in rstcs array
* @rstcs: array of struct reset_control_bulk_data with reset line names set
*
* Managed reset_control_bulk_get_optional_shared(). For reset controllers
* returned from this function, reset_control_put() is called automatically on
* driver detach.
*
* See reset_control_bulk_get_optional_shared() for more information.
*/
static inline int __must_check
devm_reset_control_bulk_get_optional_shared(struct device *dev, int num_rstcs,
struct reset_control_bulk_data *rstcs)
{
return __devm_reset_control_bulk_get(dev, num_rstcs, rstcs, true, true, false);
}
/**
* devm_reset_control_get_exclusive_by_index - resource managed
* reset_control_get_exclusive()