[PATCH v1] clk: Add devm_clk_{prepare,enable,prepare_enable}

Marc Gonzalez
2019-07-15T15:34:36Z

Provide devm variants for automatic resource release on device removal.
probe() error-handling is simpler, and remove is no longer required.

Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
---
Documentation/driver-model/devres.rst | 3 +++
drivers/clk/clk.c | 24 ++++++++++++++++++++++++
include/linux/clk.h | 8 ++++++++
3 files changed, 35 insertions(+)

diff --git a/Documentation/driver-model/devres.rst b/Documentation/driver-model/devres.rst
index 1b6ced8e4294..9357260576ef 100644
--- a/Documentation/driver-model/devres.rst
+++ b/Documentation/driver-model/devres.rst
@@ -253,6 +253,9 @@ CLOCK
devm_clk_hw_register()
devm_of_clk_add_hw_provider()
devm_clk_hw_register_clkdev()
+ devm_clk_prepare()
+ devm_clk_enable()
+ devm_clk_prepare_enable()

DMA
dmaenginem_async_device_register()
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c0990703ce54..5e85548357c0 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -914,6 +914,18 @@ int clk_prepare(struct clk *clk)
}
EXPORT_SYMBOL_GPL(clk_prepare);

+static void unprepare(void *clk)
+{
+ clk_unprepare(clk);
+}
+
+int devm_clk_prepare(struct device *dev, struct clk *clk)
+{
+ int rc = clk_prepare(clk);
+ return rc ? : devm_add_action_or_reset(dev, unprepare, clk);
+}
+EXPORT_SYMBOL_GPL(devm_clk_prepare);
+
static void clk_core_disable(struct clk_core *core)
{
lockdep_assert_held(&enable_lock);
@@ -1136,6 +1148,18 @@ int clk_enable(struct clk *clk)
}
EXPORT_SYMBOL_GPL(clk_enable);

+static void disable(void *clk)
+{
+ clk_disable(clk);
+}
+
+int devm_clk_enable(struct device *dev, struct clk *clk)
+{
+ int rc = clk_enable(clk);
+ return rc ? : devm_add_action_or_reset(dev, disable, clk);
+}
+EXPORT_SYMBOL_GPL(devm_clk_enable);
+
static int clk_core_prepare_enable(struct clk_core *core)
{
int ret;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 3c096c7a51dc..d09b5207e3f1 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -895,6 +895,14 @@ static inline void clk_restore_context(void) {}

#endif

+int devm_clk_prepare(struct device *dev, struct clk *clk);
+int devm_clk_enable(struct device *dev, struct clk *clk);
+static inline int devm_clk_prepare_enable(struct device *dev, struct clk *clk)
+{
+ int rc = devm_clk_prepare(dev, clk);
+ return rc ? : devm_clk_enable(dev, clk);
+}
+
/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
static inline int clk_prepare_enable(struct clk *clk)
{
--
2.17.1