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Subject[PATCH v5 2/9] clk: of_clk - add managed provider registrations
With MFD devices the clk properties may be contained in MFD (parent) DT
node. Current devm_of_clk_add_hw_provider assumes the clk is bound to MFD
subdevice not to MFD device (parent). Add
devm_of_clk_add_hw_provider_parent to tackle this issue.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
Documentation/driver-model/devres.txt | 1 +
drivers/clk/clk.c | 65 ++++++++++++++++++++++++++++++-----
include/linux/clk-provider.h | 11 ++++++
3 files changed, 68 insertions(+), 9 deletions(-)

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index dbf14326243b..97c9c575b2af 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -238,6 +238,7 @@ CLOCK
devm_clk_put()
devm_clk_hw_register()
devm_of_clk_add_hw_provider()
+ devm_of_clk_add_parent_hw_provider()
devm_clk_hw_register_clkdev()

DMA
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index af011974d4ec..30beb60bd8f9 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3893,12 +3893,12 @@ static void devm_of_clk_release_provider(struct device *dev, void *res)
of_clk_del_provider(*(struct device_node **)res);
}

-int devm_of_clk_add_hw_provider(struct device *dev,
+static int __devm_of_clk_add_hw_provider(struct device *dev,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
- void *data)
+ struct device_node *of_node, void *data)
{
- struct device_node **ptr, *np;
+ struct device_node **ptr;
int ret;

ptr = devres_alloc(devm_of_clk_release_provider, sizeof(*ptr),
@@ -3906,19 +3906,62 @@ int devm_of_clk_add_hw_provider(struct device *dev,
if (!ptr)
return -ENOMEM;

- np = dev->of_node;
- ret = of_clk_add_hw_provider(np, get, data);
- if (!ret) {
- *ptr = np;
+ *ptr = of_node;
+ ret = of_clk_add_hw_provider(of_node, get, data);
+ if (!ret)
devres_add(dev, ptr);
- } else {
+ else
devres_free(ptr);
- }

return ret;
}
+
+/**
+ * devm_of_clk_add_hw_provider() - Managed clk provider node registration
+ * @dev: Device acting as the clock provider. Used for DT node and lifetime.
+ * @get: callback for decoding clk_hw
+ * @data: context pointer for @get callback.
+ *
+ * Returns 0 on success or an errno on failure.
+ *
+ * Registers clock provider for given device's node. Provider is automatically
+ * released at device exit.
+ */
+int devm_of_clk_add_hw_provider(struct device *dev,
+ struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+ void *data),
+ void *data)
+{
+ return __devm_of_clk_add_hw_provider(dev, get, dev->of_node, data);
+}
EXPORT_SYMBOL_GPL(devm_of_clk_add_hw_provider);

+/**
+ * devm_of_clk_add_parent_hw_provider() - Managed clk provider node registration
+ * @dev: Device acting as the clock provider. Provider's DT node is parent node.
+ * @get: callback for decoding clk_hw
+ * @data: context pointer for @get callback.
+ *
+ * Returns 0 on success or an errno on failure.
+ *
+ * Registers clock provider for given device's parent node. Usable in cases
+ * where it really is the parent node that contains the provider information.
+ * Typical use-cases are MFD devices where the MFD sub-device is handling
+ * actual clock HW but the MFD node (parent) is containing the clock
+ * information.
+ *
+ * Provider is automatically released at device exit.
+ */
+int devm_of_clk_add_parent_hw_provider(struct device *dev,
+ struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+ void *data),
+ void *data)
+{
+ return __devm_of_clk_add_hw_provider(dev, get, dev->parent->of_node,
+ data);
+}
+EXPORT_SYMBOL_GPL(devm_of_clk_add_parent_hw_provider);
+
/**
* of_clk_del_provider() - Remove a previously registered clock provider
* @np: Device node pointer associated with clock provider
@@ -3950,6 +3993,10 @@ static int devm_clk_provider_match(struct device *dev, void *res, void *data)
return *np == data;
}

+/**
+ * devm_of_clk_del_provider() - Remove clock provider registered using devm
+ * @dev: Device to whose lifetime the clock provider was bound
+ */
void devm_of_clk_del_provider(struct device *dev)
{
int ret;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 60c51871b04b..a6663f084cf1 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -916,6 +916,10 @@ int devm_of_clk_add_hw_provider(struct device *dev,
struct clk_hw *(*get)(struct of_phandle_args *clkspec,
void *data),
void *data);
+int devm_of_clk_add_parent_hw_provider(struct device *dev,
+ struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+ void *data),
+ void *data);
void of_clk_del_provider(struct device_node *np);
void devm_of_clk_del_provider(struct device *dev);
struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
@@ -953,6 +957,13 @@ static inline int devm_of_clk_add_hw_provider(struct device *dev,
{
return 0;
}
+static inline int devm_of_clk_add_parent_hw_provider(struct device *dev,
+ struct clk_hw *(*get)(struct of_phandle_args *clkspec,
+ void *data),
+ void *data)
+{
+ return 0;
+}
static inline void of_clk_del_provider(struct device_node *np) {}
static inline void devm_of_clk_del_provider(struct device *dev) {}
static inline struct clk *of_clk_src_simple_get(
--
2.14.3

--
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes. Just then, he vanished ~~~

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