diff mbox series

[v3,1/4] clk: Provide devm_clk_bulk_get_all_enabled() helper

Message ID 20241018-clk_bulk_ena_fix-v3-1-57e8bb82460c@collabora.com
State Superseded
Headers show
Series Provide devm_clk_bulk_get_all_enabled() helper | expand

Commit Message

Cristian Ciocaltea Oct. 17, 2024, 11:17 p.m. UTC 
Commit 265b07df758a ("clk: Provide managed helper to get and enable bulk
clocks") added devm_clk_bulk_get_all_enable() function, but missed to
return the number of clocks stored in the clk_bulk_data table referenced
by the clks argument.  Without knowing the number, it's not possible to
iterate these clocks when needed, hence the argument is useless and
could have been simply removed.

Introduce devm_clk_bulk_get_all_enabled() variant, which is consistent
with devm_clk_bulk_get_all() in terms of the returned value:

 > 0 if one or more clocks have been stored
 = 0 if there are no clocks
 < 0 if an error occurred

Moreover, the naming is consistent with devm_clk_get_enabled(), i.e. use
the past form of 'enable'.

To reduce code duplication and improve patch readability, make
devm_clk_bulk_get_all_enable() use the new helper, as suggested by
Stephen Boyd.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
 drivers/clk/clk-devres.c | 35 +++++++++++++++++++++++------------
 include/linux/clk.h      | 24 ++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 12 deletions(-)

Comments

Stephen Boyd Oct. 19, 2024, 5:56 a.m. UTC | #1 
Quoting Cristian Ciocaltea (2024-10-17 16:17:29)
> diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
> index 82ae1f26e634572b943d18b8d86267f0a69911a6..0d0fe364b66a8590d5e7c63dc6c1e70c59d53e89 100644
> --- a/drivers/clk/clk-devres.c
> +++ b/drivers/clk/clk-devres.c
> @@ -230,25 +239,27 @@ int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
>                 return -ENOMEM;
>  
>         ret = clk_bulk_get_all(dev, &devres->clks);
> -       if (ret > 0) {
> -               *clks = devres->clks;
> -               devres->num_clks = ret;
> -       } else {
> -               devres_free(devres);
> -               return ret;
> -       }
> +       if (ret <= 0)
> +               goto err_free_devres;

Please don't use goto so that the diff is minimized.

> +
> +       *clks = devres->clks;
> +       devres->num_clks = ret;
>  
>         ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
> -       if (!ret) {
> -               devres_add(dev, devres);
> -       } else {
> +       if (ret) {
>                 clk_bulk_put_all(devres->num_clks, devres->clks);
> -               devres_free(devres);
> +               goto err_free_devres;

		return ret;
Cristian Ciocaltea Oct. 19, 2024, 11:20 a.m. UTC | #2 
On 10/19/24 8:56 AM, Stephen Boyd wrote:
> Quoting Cristian Ciocaltea (2024-10-17 16:17:29)
>> diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
>> index 82ae1f26e634572b943d18b8d86267f0a69911a6..0d0fe364b66a8590d5e7c63dc6c1e70c59d53e89 100644
>> --- a/drivers/clk/clk-devres.c
>> +++ b/drivers/clk/clk-devres.c
>> @@ -230,25 +239,27 @@ int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
>>                 return -ENOMEM;
>>  
>>         ret = clk_bulk_get_all(dev, &devres->clks);
>> -       if (ret > 0) {
>> -               *clks = devres->clks;
>> -               devres->num_clks = ret;
>> -       } else {
>> -               devres_free(devres);
>> -               return ret;
>> -       }
>> +       if (ret <= 0)
>> +               goto err_free_devres;
> 
> Please don't use goto so that the diff is minimized.

Done in v4:

https://lore.kernel.org/all/20241019-clk_bulk_ena_fix-v4-0-57f108f64e70@collabora.com/

Regards,
Cristian
diff mbox series

Patch

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index 82ae1f26e634572b943d18b8d86267f0a69911a6..0d0fe364b66a8590d5e7c63dc6c1e70c59d53e89 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -220,6 +220,15 @@  static void devm_clk_bulk_release_all_enable(struct device *dev, void *res)
 
 int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
 					      struct clk_bulk_data **clks)
+{
+	int ret = devm_clk_bulk_get_all_enabled(dev, clks);
+
+	return ret > 0 ? 0 : ret;
+}
+EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enable);
+
+int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+					       struct clk_bulk_data **clks)
 {
 	struct clk_bulk_devres *devres;
 	int ret;
@@ -230,25 +239,27 @@  int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
 		return -ENOMEM;
 
 	ret = clk_bulk_get_all(dev, &devres->clks);
-	if (ret > 0) {
-		*clks = devres->clks;
-		devres->num_clks = ret;
-	} else {
-		devres_free(devres);
-		return ret;
-	}
+	if (ret <= 0)
+		goto err_free_devres;
+
+	*clks = devres->clks;
+	devres->num_clks = ret;
 
 	ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
-	if (!ret) {
-		devres_add(dev, devres);
-	} else {
+	if (ret) {
 		clk_bulk_put_all(devres->num_clks, devres->clks);
-		devres_free(devres);
+		goto err_free_devres;
 	}
 
+	devres_add(dev, devres);
+
+	return devres->num_clks;
+
+err_free_devres:
+	devres_free(devres);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enable);
+EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enabled);
 
 static int devm_clk_match(struct device *dev, void *res, void *data)
 {
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 851a0f2cf42c8c1bbada49d991bc185587942155..158c5072852e36c1583dc47ca7516fcdd928fe59 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -511,6 +511,24 @@  int __must_check devm_clk_bulk_get_all(struct device *dev,
 int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
 					      struct clk_bulk_data **clks);
 
+/**
+ * devm_clk_bulk_get_all_enabled - Get and enable all clocks of the consumer (managed)
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ *
+ * Returns a positive value for the number of clocks obtained while the
+ * clock references are stored in the clk_bulk_data table in @clks field.
+ * Returns 0 if there're none and a negative value if something failed.
+ *
+ * This helper function allows drivers to get all clocks of the
+ * consumer and enables them in one operation with management.
+ * The clks will automatically be disabled and freed when the device
+ * is unbound.
+ */
+
+int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+					       struct clk_bulk_data **clks);
+
 /**
  * devm_clk_get - lookup and obtain a managed reference to a clock producer.
  * @dev: device for clock "consumer"
@@ -1040,6 +1058,12 @@  static inline int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
 	return 0;
 }
 
+static inline int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+						struct clk_bulk_data **clks)
+{
+	return 0;
+}
+
 static inline struct clk *devm_get_clk_from_child(struct device *dev,
 				struct device_node *np, const char *con_id)
 {