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clk: add devm variant of clk_notifier_register 

Add a memory managed variant of clk_notifier_register() to make life easier
on clock consumers using notifiers

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20201021163847.595189-2-jbrunet@baylibre.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Jerome Brunet 2020-10-21 18:38:46 +02:00 committed by Stephen Boyd
parent 8e677e7f0a
commit 6d30d50d03
2 changed files with 46 additions and 0 deletions
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36
drivers/clk/clk.c
View File

@ -4395,6 +4395,42 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(clk_notifier_unregister);
struct clk_notifier_devres {
struct clk *clk;
struct notifier_block *nb;
};
static void devm_clk_notifier_release(struct device *dev, void *res)
{
struct clk_notifier_devres *devres = res;
clk_notifier_unregister(devres->clk, devres->nb);
}
int devm_clk_notifier_register(struct device *dev, struct clk *clk,
struct notifier_block *nb)
{
struct clk_notifier_devres *devres;
int ret;
devres = devres_alloc(devm_clk_notifier_release,
sizeof(*devres), GFP_KERNEL);
if (!devres)
return -ENOMEM;
ret = clk_notifier_register(clk, nb);
if (!ret) {
devres->clk = clk;
devres->nb = nb;
} else {
devres_free(devres);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_clk_notifier_register);
#ifdef CONFIG_OF
static void clk_core_reparent_orphans(void)
{

10
include/linux/clk.h
View File

@ -109,6 +109,16 @@ int clk_notifier_register(struct clk *clk, struct notifier_block *nb);
*/
int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
/**
* devm_clk_notifier_register - register a managed rate-change notifier callback
* @dev: device for clock "consumer"
* @clk: clock whose rate we are interested in
* @nb: notifier block with callback function pointer
*
* Returns 0 on success, -EERROR otherwise
*/
int devm_clk_notifier_register(struct device *dev, struct clk *clk, struct notifier_block *nb);
/**
* clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion)
* for a clock source.