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reset: add devm_reset_controller_register API

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Add a device managed API for reset_controller_register().

This helps in reducing code in .remove callbacks and sometimes
dropping .remove callbacks entirely.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Masahiro Yamada 2016-05-01 19:36:57 +09:00 committed by Philipp Zabel
parent 1a695a905c
commit 8d5b5d5ce5
3 changed files with 45 additions and 0 deletions
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4
Documentation/driver-model/devres.txt
View File

@ -352,6 +352,10 @@ REGULATOR
devm_regulator_put()
devm_regulator_register()
RESET
devm_reset_control_get()
devm_reset_controller_register()
SLAVE DMA ENGINE
devm_acpi_dma_controller_register()

37
drivers/reset/core.c
View File

@ -93,6 +93,43 @@ void reset_controller_unregister(struct reset_controller_dev *rcdev)
}
EXPORT_SYMBOL_GPL(reset_controller_unregister);
static void devm_reset_controller_release(struct device *dev, void *res)
{
reset_controller_unregister(*(struct reset_controller_dev **)res);
}
/**
* devm_reset_controller_register - resource managed reset_controller_register()
* @dev: device that is registering this reset controller
* @rcdev: a pointer to the initialized reset controller device
*
* Managed reset_controller_register(). For reset controllers registered by
* this function, reset_controller_unregister() is automatically called on
* driver detach. See reset_controller_register() for more information.
*/
int devm_reset_controller_register(struct device *dev,
struct reset_controller_dev *rcdev)
{
struct reset_controller_dev **rcdevp;
int ret;
rcdevp = devres_alloc(devm_reset_controller_release, sizeof(*rcdevp),
GFP_KERNEL);
if (!rcdevp)
return -ENOMEM;
ret = reset_controller_register(rcdev);
if (!ret) {
*rcdevp = rcdev;
devres_add(dev, rcdevp);
} else {
devres_free(rcdevp);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_reset_controller_register);
/**
* reset_control_reset - reset the controlled device
* @rstc: reset controller

4
include/linux/reset-controller.h
View File

@ -53,4 +53,8 @@ struct reset_controller_dev {
int reset_controller_register(struct reset_controller_dev *rcdev);
void reset_controller_unregister(struct reset_controller_dev *rcdev);
struct device;
int devm_reset_controller_register(struct device *dev,
struct reset_controller_dev *rcdev);
#endif