[PATCH 0/8] clk: clkdev: managed clk lookup and provider registrations

[PATCH 0/8] clk: clkdev: managed clk lookup and provider registrations

[Matti Vaittinen]

Patch series adding managed clkdev and of_provider registrations

Few clk drivers appear to be leaking clkdev lookup registrations at
driver remove. The patch series adds devm versions of lookup
registrations and cleans up few drivers. There is no intended functional
changes besides adding clean-ups at remove or simplifying the clean-up
code by using devm. So this patch series is not fixing any potential
issues on binding the cleanups to parent device - this series only
changes the cleanup to be done using devm.

Driver clean-up patches have not been tested as I lack the HW. All testing
and comments if driver/device removal is even possible for changed drivers
is highly appreciated. If removal is not possible I will gladly drop the
relevant patches from series - although leaking lookups may serve as bad
example for new developers =)

Changed drivers are:
clk-max77686, clk-s3c2410-dclk, clk-st, clk-hi655x, rk808, clk-twl6040
and apcs-msm8916.

New devm registration variants have been tested on BeagleBoneBlack
using ROHM BD71837 PMIC driver.

Same devm variants were earlier proposed together with BD71837/BD71847
PMIC clk driver in this series:
https://lore.kernel.org/linux-clk/cover.1535630942.git.matti.vaittinen@fi.rohmeurope.com/

The BD71837/BD71847 work is currently pending for related MFD commits to
get merged in clk-tree and the devm functions are now submitted in this
series.

This patch series is based on clk-next

---

Matti Vaittinen (8):
  clk: clkdev/of_clk - add managed lookup and provider registrations
  clk: clk-max77686: Clean clkdev lookup leak and use devm
  clk: clk-s3c2410-dclk: clean up clkdev lookup leak
  clk: clk-st: avoid clkdev lookup leak at remove
  clk: clk-hi655x: Free of_provider at remove
  clk: rk808: use managed version of of_provider registration
  clk: clk-twl6040: Free of_provider at remove
  clk: apcs-msm8916: simplify probe cleanup by using devm

 Documentation/driver-model/devres.txt  |   3 +
 drivers/clk/clk-hi655x.c               |   4 +-
 drivers/clk/clk-max77686.c             |  25 ++-----
 drivers/clk/clk-rk808.c                |  15 +---
 drivers/clk/clk-twl6040.c              |   5 +-
 drivers/clk/clk.c                      |  28 ++++++--
 drivers/clk/clkdev.c                   | 122 ++++++++++++++++++++++++++-------
 drivers/clk/qcom/apcs-msm8916.c        |   5 +-
 drivers/clk/samsung/clk-s3c2410-dclk.c |  15 ++--
 drivers/clk/x86/clk-st.c               |   3 +-
 include/linux/clk-provider.h           |   4 ++
 include/linux/clkdev.h                 |   4 ++
 12 files changed, 151 insertions(+), 82 deletions(-)

-- 
2.14.3


-- 
Matti Vaittinen
ROHM Semiconductors
~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~

[PATCH 1/8] clk: clkdev/of_clk - add managed lookup and provider registrations

[Matti Vaittinen]

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.

Also clkdev registration lacks of managed registration functions and it
seems few drivers do not drop clkdev lookups at exit. Add
devm_clk_hw_register_clkdev and devm_clk_release_clkdev to ease lookup
releasing at exit.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 Documentation/driver-model/devres.txt |   3 +
 drivers/clk/clk.c                     |  28 ++++++--
 drivers/clk/clkdev.c                  | 122 ++++++++++++++++++++++++++--------
 include/linux/clk-provider.h          |   4 ++
 include/linux/clkdev.h                |   4 ++
 5 files changed, 129 insertions(+), 32 deletions(-)

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 43681ca0837f..fac63760b01c 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -238,6 +238,9 @@ 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()
+  devm_clk_release_clkdev()
 
 DMA
   dmaenginem_async_device_register()
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index af011974d4ec..9bb921eb90f6 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),
@@ -3906,10 +3906,9 @@ 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);
+	*ptr = of_node;
+	ret = of_clk_add_hw_provider(of_node, get, data);
 	if (!ret) {
-		*ptr = np;
 		devres_add(dev, ptr);
 	} else {
 		devres_free(ptr);
@@ -3917,8 +3916,25 @@ int devm_of_clk_add_hw_provider(struct device *dev,
 
 	return ret;
 }
+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);
 
+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
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 9ab3db8b3988..f6100b6e06fd 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -401,6 +401,25 @@ static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
 	return cl;
 }
 
+static int do_clk_register_clkdev(struct clk_hw *hw,
+	struct clk_lookup **cl, const char *con_id, const char *dev_id)
+{
+
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+	/*
+	 * Since dev_id can be NULL, and NULL is handled specially, we must
+	 * pass it as either a NULL format string, or with "%s".
+	 */
+	if (dev_id)
+		*cl = __clk_register_clkdev(hw, con_id, "%s",
+					   dev_id);
+	else
+		*cl = __clk_register_clkdev(hw, con_id, NULL);
+
+	return *cl ? 0 : -ENOMEM;
+}
+
 /**
  * clk_register_clkdev - register one clock lookup for a struct clk
  * @clk: struct clk to associate with all clk_lookups
@@ -420,20 +439,10 @@ int clk_register_clkdev(struct clk *clk, const char *con_id,
 {
 	struct clk_lookup *cl;
 
-	if (IS_ERR(clk))
-		return PTR_ERR(clk);
-
-	/*
-	 * Since dev_id can be NULL, and NULL is handled specially, we must
-	 * pass it as either a NULL format string, or with "%s".
-	 */
-	if (dev_id)
-		cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, "%s",
-					   dev_id);
-	else
-		cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, NULL);
-
-	return cl ? 0 : -ENOMEM;
+	if (!IS_ERR(clk))
+		return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
+					      dev_id);
+	return PTR_ERR(clk);
 }
 EXPORT_SYMBOL(clk_register_clkdev);
 
@@ -456,18 +465,79 @@ int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
 {
 	struct clk_lookup *cl;
 
-	if (IS_ERR(hw))
-		return PTR_ERR(hw);
+	return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
+}
+EXPORT_SYMBOL(clk_hw_register_clkdev);
 
-	/*
-	 * Since dev_id can be NULL, and NULL is handled specially, we must
-	 * pass it as either a NULL format string, or with "%s".
-	 */
-	if (dev_id)
-		cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
-	else
-		cl = __clk_register_clkdev(hw, con_id, NULL);
+static void devm_clkdev_release(struct device *dev, void *res)
+{
+	clkdev_drop(*(struct clk_lookup **)res);
+}
 
-	return cl ? 0 : -ENOMEM;
+static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
+{
+	struct clk_lookup **l = res;
+
+	if (!l || !*l) {
+		WARN_ON(!l || !*l);
+		return 0;
+	}
+	return *l == data;
 }
-EXPORT_SYMBOL(clk_hw_register_clkdev);
+
+/**
+ * devm_clk_release_clkdev - Resource managed clkdev lookup release
+ * @dev: device this lookup is bound
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * Drop the clkdev lookup created with devm_clk_hw_register_clkdev.
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+			     const char *dev_id)
+{
+	struct clk_lookup *cl;
+	int rval;
+
+	cl = clk_find(dev_id, con_id);
+	WARN_ON(!cl);
+	rval = devres_release(dev, devm_clkdev_release,
+			      &devm_clk_match_clkdev, cl);
+	WARN_ON(rval);
+}
+EXPORT_SYMBOL(devm_clk_release_clkdev);
+
+/**
+ * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
+ * @dev: device this lookup is bound
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * con_id or dev_id may be NULL as a wildcard, just as in the rest of
+ * clkdev.
+ *
+ * To make things easier for mass registration, we detect error clk_hws
+ * from a previous clk_hw_register_*() call, and return the error code for
+ * those.  This is to permit this function to be called immediately
+ * after clk_hw_register_*().
+ */
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+				const char *con_id, const char *dev_id)
+{
+	int rval = -ENOMEM;
+	struct clk_lookup **cl;
+
+	cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
+	if (cl) {
+		rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
+		if (!rval)
+			devres_add(dev, cl);
+		else
+			devres_free(cl);
+	}
+	return rval;
+}
+EXPORT_SYMBOL(devm_clk_hw_register_clkdev);
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 60c51871b04b..94c7bf471c31 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,
diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h
index 4890ff033220..ccb32af5848b 100644
--- a/include/linux/clkdev.h
+++ b/include/linux/clkdev.h
@@ -52,4 +52,8 @@ int clk_add_alias(const char *, const char *, const char *, struct device *);
 int clk_register_clkdev(struct clk *, const char *, const char *);
 int clk_hw_register_clkdev(struct clk_hw *, const char *, const char *);
 
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+				const char *con_id, const char *dev_id);
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+			     const char *dev_id);
 #endif
-- 
2.14.3

Re: [PATCH 1/8] clk: clkdev/of_clk - add managed lookup and provider registrations

[Matti Vaittinen]

On Wed, Oct 31, 2018 at 10:30:34AM +0200, Matti Vaittinen wrote:
> 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.
> 
> Also clkdev registration lacks of managed registration functions and it
> seems few drivers do not drop clkdev lookups at exit. Add
> devm_clk_hw_register_clkdev and devm_clk_release_clkdev to ease lookup
> releasing at exit.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>

//snip

> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 60c51871b04b..94c7bf471c31 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,

Right. Didn't spot the 
#ifdef CONFIG_OF
in clk-provider.h. So patch lacks of stub functions for non OF
architectures. The 0-Day test system spot this. Tomorrow I'll send v2
where the inlined stub functions for non OF architectures are added.

Br,
	Matti Vaittinen

-- 
Matti Vaittinen
ROHM Semiconductors

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

[PATCH 2/8] clk: clk-max77686: Clean clkdev lookup leak and use devm

[Matti Vaittinen]

clk-max77686 never clean clkdev lookup at remove. This can cause
oops if clk-max77686 is removed and inserted again. Fix leak by
using new devm clkdev lookup registration. Simplify also error
path by using new devm_of_clk_add_parent_hw_provider.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/clk-max77686.c | 25 ++++---------------------
 1 file changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 02551fe4b87c..b1920c1d9b76 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -235,7 +235,7 @@ static int max77686_clk_probe(struct platform_device *pdev)
 			return ret;
 		}
 
-		ret = clk_hw_register_clkdev(&max_clk_data->hw,
+		ret = devm_clk_hw_register_clkdev(dev, &max_clk_data->hw,
 					     max_clk_data->clk_idata.name, NULL);
 		if (ret < 0) {
 			dev_err(dev, "Failed to clkdev register: %d\n", ret);
@@ -244,8 +244,8 @@ static int max77686_clk_probe(struct platform_device *pdev)
 	}
 
 	if (parent->of_node) {
-		ret = of_clk_add_hw_provider(parent->of_node, of_clk_max77686_get,
-					     drv_data);
+		ret = devm_of_clk_add_parent_hw_provider(dev,
+						of_clk_max77686_get, drv_data);
 
 		if (ret < 0) {
 			dev_err(dev, "Failed to register OF clock provider: %d\n",
@@ -261,27 +261,11 @@ static int max77686_clk_probe(struct platform_device *pdev)
 					 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
 		if (ret < 0) {
 			dev_err(dev, "Failed to config low-jitter: %d\n", ret);
-			goto remove_of_clk_provider;
+			return ret;
 		}
 	}
 
 	return 0;
-
-remove_of_clk_provider:
-	if (parent->of_node)
-		of_clk_del_provider(parent->of_node);
-
-	return ret;
-}
-
-static int max77686_clk_remove(struct platform_device *pdev)
-{
-	struct device *parent = pdev->dev.parent;
-
-	if (parent->of_node)
-		of_clk_del_provider(parent->of_node);
-
-	return 0;
 }
 
 static const struct platform_device_id max77686_clk_id[] = {
@@ -297,7 +281,6 @@ static struct platform_driver max77686_clk_driver = {
 		.name  = "max77686-clk",
 	},
 	.probe = max77686_clk_probe,
-	.remove = max77686_clk_remove,
 	.id_table = max77686_clk_id,
 };
 
-- 
2.14.3

[PATCH 3/8] clk: clk-s3c2410-dclk: clean up clkdev lookup leak

[Matti Vaittinen]

Use devm variant of clkdev lookup registration in order to avoid
clkdev lookup leak at device remove.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/samsung/clk-s3c2410-dclk.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/samsung/clk-s3c2410-dclk.c b/drivers/clk/samsung/clk-s3c2410-dclk.c
index 0d92f3e5e3d9..07798debfec4 100644
--- a/drivers/clk/samsung/clk-s3c2410-dclk.c
+++ b/drivers/clk/samsung/clk-s3c2410-dclk.c
@@ -309,16 +309,17 @@ static int s3c24xx_dclk_probe(struct platform_device *pdev)
 			goto err_clk_register;
 		}
 
-	ret = clk_hw_register_clkdev(clk_table[MUX_DCLK0], "dclk0", NULL);
+	ret = devm_clk_hw_register_clkdev(&pdev->dev, clk_table[MUX_DCLK0],
+					  "dclk0", NULL);
 	if (!ret)
-		ret = clk_hw_register_clkdev(clk_table[MUX_DCLK1], "dclk1",
-					     NULL);
+		ret = devm_clk_hw_register_clkdev(&pdev->dev,
+				clk_table[MUX_DCLK1], "dclk1", NULL);
 	if (!ret)
-		ret = clk_hw_register_clkdev(clk_table[MUX_CLKOUT0],
-					     "clkout0", NULL);
+		ret = devm_clk_hw_register_clkdev(&pdev->dev,
+				clk_table[MUX_CLKOUT0], "clkout0", NULL);
 	if (!ret)
-		ret = clk_hw_register_clkdev(clk_table[MUX_CLKOUT1],
-					     "clkout1", NULL);
+		ret = devm_clk_hw_register_clkdev(&pdev->dev,
+				clk_table[MUX_CLKOUT1], "clkout1", NULL);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register aliases, %d\n", ret);
 		goto err_clk_register;
-- 
2.14.3

[PATCH 4/8] clk: clk-st: avoid clkdev lookup leak at remove

[Matti Vaittinen]

Use devm based clkdev lookup registration to avoid leaking lookup
structures.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/x86/clk-st.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/x86/clk-st.c b/drivers/clk/x86/clk-st.c
index fb62f3938008..32d8df9bd853 100644
--- a/drivers/clk/x86/clk-st.c
+++ b/drivers/clk/x86/clk-st.c
@@ -52,7 +52,8 @@ static int st_clk_probe(struct platform_device *pdev)
 		0, st_data->base + MISCCLKCNTL1, OSCCLKENB,
 		CLK_GATE_SET_TO_DISABLE, NULL);
 
-	clk_hw_register_clkdev(hws[ST_CLK_GATE], "oscout1", NULL);
+	devm_clk_hw_register_clkdev(&pdev->dev, hws[ST_CLK_GATE], "oscout1",
+				    NULL);
 
 	return 0;
 }
-- 
2.14.3

[PATCH 5/8] clk: clk-hi655x: Free of_provider at remove

[Matti Vaittinen]

use devm variant for of_provider registration so provider is freed
at exit.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/clk-hi655x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-hi655x.c b/drivers/clk/clk-hi655x.c
index 403a0188634a..394d0109104d 100644
--- a/drivers/clk/clk-hi655x.c
+++ b/drivers/clk/clk-hi655x.c
@@ -107,8 +107,8 @@ static int hi655x_clk_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
-				     &hi655x_clk->clk_hw);
+	return devm_of_clk_add_parent_hw_provider(&pdev->dev,
+				of_clk_hw_simple_get, &hi655x_clk->clk_hw);
 }
 
 static struct platform_driver hi655x_clk_driver = {
-- 
2.14.3

[PATCH 6/8] clk: rk808: use managed version of of_provider registration

[Matti Vaittinen]

Simplify clean-up for rk808 by using managed version of of_provider
registration.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/clk-rk808.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
index 6461f2820a5b..177340edaae5 100644
--- a/drivers/clk/clk-rk808.c
+++ b/drivers/clk/clk-rk808.c
@@ -138,23 +138,12 @@ static int rk808_clkout_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return of_clk_add_hw_provider(node, of_clk_rk808_get, rk808_clkout);
-}
-
-static int rk808_clkout_remove(struct platform_device *pdev)
-{
-	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
-	struct i2c_client *client = rk808->i2c;
-	struct device_node *node = client->dev.of_node;
-
-	of_clk_del_provider(node);
-
-	return 0;
+	return devm_of_clk_add_parent_hw_provider(&pdev->dev,
+					of_clk_rk808_get, rk808_clkout);
 }
 
 static struct platform_driver rk808_clkout_driver = {
 	.probe = rk808_clkout_probe,
-	.remove = rk808_clkout_remove,
 	.driver		= {
 		.name	= "rk808-clkout",
 	},
-- 
2.14.3

[PATCH 7/8] clk: clk-twl6040: Free of_provider at remove

[Matti Vaittinen]

use devm variant for of_provider registration so provider is freed
at exit.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/clk-twl6040.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-twl6040.c b/drivers/clk/clk-twl6040.c
index 25dfe050ae9f..e9da09453eb2 100644
--- a/drivers/clk/clk-twl6040.c
+++ b/drivers/clk/clk-twl6040.c
@@ -108,9 +108,8 @@ static int twl6040_pdmclk_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, clkdata);
 
-	return of_clk_add_hw_provider(pdev->dev.parent->of_node,
-				      of_clk_hw_simple_get,
-				      &clkdata->pdmclk_hw);
+	return devm_of_clk_add_parent_hw_provider(&pdev->dev,
+			of_clk_hw_simple_get, &clkdata->pdmclk_hw);
 }
 
 static struct platform_driver twl6040_pdmclk_driver = {
-- 
2.14.3

Re: [PATCH 7/8] clk: clk-twl6040: Free of_provider at remove

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2137 bytes --]

Hi Matti,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on clk/clk-next]
[also build test ERROR on v4.19 next-20181031]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Matti-Vaittinen/clk-clkdev-managed-clk-lookup-and-provider-registrations/20181031-182055
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
config: i386-randconfig-x075-201843 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers//clk/clk-twl6040.c: In function 'twl6040_pdmclk_probe':
>> drivers//clk/clk-twl6040.c:111:9: error: implicit declaration of function 'devm_of_clk_add_parent_hw_provider'; did you mean 'devm_of_clk_add_hw_provider'? [-Werror=implicit-function-declaration]
     return devm_of_clk_add_parent_hw_provider(&pdev->dev,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            devm_of_clk_add_hw_provider
   cc1: some warnings being treated as errors

vim +111 drivers//clk/clk-twl6040.c

    90	
    91	static int twl6040_pdmclk_probe(struct platform_device *pdev)
    92	{
    93		struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
    94		struct twl6040_pdmclk *clkdata;
    95		int ret;
    96	
    97		clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
    98		if (!clkdata)
    99			return -ENOMEM;
   100	
   101		clkdata->dev = &pdev->dev;
   102		clkdata->twl6040 = twl6040;
   103	
   104		clkdata->pdmclk_hw.init = &twl6040_pdmclk_init;
   105		ret = devm_clk_hw_register(&pdev->dev, &clkdata->pdmclk_hw);
   106		if (ret)
   107			return ret;
   108	
   109		platform_set_drvdata(pdev, clkdata);
   110	
 > 111		return devm_of_clk_add_parent_hw_provider(&pdev->dev,
   112				of_clk_hw_simple_get, &clkdata->pdmclk_hw);
   113	}
   114	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 33863 bytes --]

Re: [PATCH 7/8] clk: clk-twl6040: Free of_provider at remove

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2099 bytes --]

Hi Matti,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on clk/clk-next]
[also build test ERROR on v4.19 next-20181031]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Matti-Vaittinen/clk-clkdev-managed-clk-lookup-and-provider-registrations/20181031-182055
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
config: x86_64-randconfig-r0-10311818 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/clk/clk-twl6040.c: In function 'twl6040_pdmclk_probe':
>> drivers/clk/clk-twl6040.c:111:9: error: implicit declaration of function 'devm_of_clk_add_parent_hw_provider' [-Werror=implicit-function-declaration]
     return devm_of_clk_add_parent_hw_provider(&pdev->dev,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/devm_of_clk_add_parent_hw_provider +111 drivers/clk/clk-twl6040.c

    90	
    91	static int twl6040_pdmclk_probe(struct platform_device *pdev)
    92	{
    93		struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
    94		struct twl6040_pdmclk *clkdata;
    95		int ret;
    96	
    97		clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
    98		if (!clkdata)
    99			return -ENOMEM;
   100	
   101		clkdata->dev = &pdev->dev;
   102		clkdata->twl6040 = twl6040;
   103	
   104		clkdata->pdmclk_hw.init = &twl6040_pdmclk_init;
   105		ret = devm_clk_hw_register(&pdev->dev, &clkdata->pdmclk_hw);
   106		if (ret)
   107			return ret;
   108	
   109		platform_set_drvdata(pdev, clkdata);
   110	
 > 111		return devm_of_clk_add_parent_hw_provider(&pdev->dev,
   112				of_clk_hw_simple_get, &clkdata->pdmclk_hw);
   113	}
   114	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 32427 bytes --]

[PATCH 8/8] clk: apcs-msm8916: simplify probe cleanup by using devm

[Matti Vaittinen]

use devm variant for of_provider registration.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/clk/qcom/apcs-msm8916.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/apcs-msm8916.c b/drivers/clk/qcom/apcs-msm8916.c
index b1cc8dbcd327..f4e0c136ab1a 100644
--- a/drivers/clk/qcom/apcs-msm8916.c
+++ b/drivers/clk/qcom/apcs-msm8916.c
@@ -96,8 +96,8 @@ static int qcom_apcs_msm8916_clk_probe(struct platform_device *pdev)
 		goto err;
 	}
 
-	ret = of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
-				     &a53cc->clkr.hw);
+	ret = devm_of_clk_add_parent_hw_provider(dev, of_clk_hw_simple_get,
+						 &a53cc->clkr.hw);
 	if (ret) {
 		dev_err(dev, "failed to add clock provider: %d\n", ret);
 		goto err;
@@ -118,7 +118,6 @@ static int qcom_apcs_msm8916_clk_remove(struct platform_device *pdev)
 	struct device *parent = pdev->dev.parent;
 
 	clk_notifier_unregister(a53cc->pclk, &a53cc->clk_nb);
-	of_clk_del_provider(parent->of_node);
 
 	return 0;
 }
-- 
2.14.3