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Subject[PATCH 1/2] clk: add devm variant of clk_notifier_register
Date
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>
---
drivers/clk/clk.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/clk.h | 10 ++++++++++
2 files changed, 46 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d27153f26fa9..e9fdd1d9b3f5 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -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)
{
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 7fd6a1febcf4..79fb52f93053 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -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.
--
2.25.4
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