diff mbox series

[04/23] gpiolib: generalize devprop_gpiochip_set_names() for device properties

Message ID 20200904154547.3836-5-brgl@bgdev.pl (mailing list archive)
State Not Applicable, archived
Headers show
Series gpio: mockup: support dynamically created and removed chips | expand

Commit Message

Bartosz Golaszewski Sept. 4, 2020, 3:45 p.m. UTC 
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

devprop_gpiochip_set_names() is overly complicated with taking the
fwnode argument (which requires using dev_fwnode() & of_fwnode_handle()
in ACPI and OF GPIO code respectively). Let's just switch to using the
generic device properties.

This allows us to pull the code setting line names directly into
gpiochip_add_data_with_key() instead of handling it separately for
ACPI and OF.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/gpio/gpiolib-acpi.c    |  3 ---
 drivers/gpio/gpiolib-devprop.c | 19 ++++++++++---------
 drivers/gpio/gpiolib-of.c      |  5 -----
 drivers/gpio/gpiolib.c         |  8 ++++----
 include/linux/gpio/driver.h    |  3 +--
 5 files changed, 15 insertions(+), 23 deletions(-)

Comments

Andy Shevchenko Sept. 4, 2020, 4:38 p.m. UTC | #1 
On Fri, Sep 04, 2020 at 05:45:28PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> devprop_gpiochip_set_names() is overly complicated with taking the
> fwnode argument (which requires using dev_fwnode() & of_fwnode_handle()
> in ACPI and OF GPIO code respectively). Let's just switch to using the
> generic device properties.
> 
> This allows us to pull the code setting line names directly into
> gpiochip_add_data_with_key() instead of handling it separately for
> ACPI and OF.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  drivers/gpio/gpiolib-acpi.c    |  3 ---
>  drivers/gpio/gpiolib-devprop.c | 19 ++++++++++---------
>  drivers/gpio/gpiolib-of.c      |  5 -----
>  drivers/gpio/gpiolib.c         |  8 ++++----
>  include/linux/gpio/driver.h    |  3 +--
>  5 files changed, 15 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> index 54ca3c18b291..834a12f3219e 100644
> --- a/drivers/gpio/gpiolib-acpi.c
> +++ b/drivers/gpio/gpiolib-acpi.c
> @@ -1221,9 +1221,6 @@ void acpi_gpiochip_add(struct gpio_chip *chip)
>  		return;
>  	}
>  
> -	if (!chip->names)
> -		devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
> -
>  	acpi_gpiochip_request_regions(acpi_gpio);
>  	acpi_gpiochip_scan_gpios(acpi_gpio);
>  	acpi_walk_dep_device_list(handle);
> diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c
> index 26741032fa9e..a28659b4f9c9 100644
> --- a/drivers/gpio/gpiolib-devprop.c
> +++ b/drivers/gpio/gpiolib-devprop.c
> @@ -17,25 +17,24 @@
>  /**
>   * devprop_gpiochip_set_names - Set GPIO line names using device properties
>   * @chip: GPIO chip whose lines should be named, if possible
> - * @fwnode: Property Node containing the gpio-line-names property
>   *
>   * Looks for device property "gpio-line-names" and if it exists assigns
>   * GPIO line names for the chip. The memory allocated for the assigned
> - * names belong to the underlying firmware node and should not be released
> + * names belong to the underlying software node and should not be released
>   * by the caller.
>   */
> -void devprop_gpiochip_set_names(struct gpio_chip *chip,
> -				const struct fwnode_handle *fwnode)
> +int devprop_gpiochip_set_names(struct gpio_chip *chip)
>  {
>  	struct gpio_device *gdev = chip->gpiodev;
> +	struct device *dev = chip->parent;
>  	const char **names;
>  	int ret, i;
>  	int count;
>  
> -	count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
> +	count = device_property_read_string_array(dev, "gpio-line-names",
>  						  NULL, 0);
>  	if (count < 0)
> -		return;
> +		return 0;

Can we introduce a followup to 33ee09cd59ce ("device property: Add helpers to
count items in an array") for strings?

>  	if (count > gdev->ngpio) {
>  		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
> @@ -45,19 +44,21 @@ void devprop_gpiochip_set_names(struct gpio_chip *chip,
>  
>  	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
>  	if (!names)
> -		return;
> +		return -ENOMEM;
>  
> -	ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
> +	ret = device_property_read_string_array(dev, "gpio-line-names",
>  						names, count);
>  	if (ret < 0) {
>  		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
>  		kfree(names);
> -		return;
> +		return ret;
>  	}
>  
>  	for (i = 0; i < count; i++)
>  		gdev->descs[i].name = names[i];
>  
>  	kfree(names);
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index bd31dd3b6a75..2f895a2b8411 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -1026,11 +1026,6 @@ int of_gpiochip_add(struct gpio_chip *chip)
>  	if (ret)
>  		return ret;
>  
> -	/* If the chip defines names itself, these take precedence */
> -	if (!chip->names)
> -		devprop_gpiochip_set_names(chip,
> -					   of_fwnode_handle(chip->of_node));
> -
>  	of_node_get(chip->of_node);
>  
>  	ret = of_gpiochip_scan_gpios(chip);
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 80137c1b3cdc..0d390f0ec32c 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -340,9 +340,6 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
>  	struct gpio_device *gdev = gc->gpiodev;
>  	int i;
>  
> -	if (!gc->names)
> -		return 0;
> -
>  	/* First check all names if they are unique */
>  	for (i = 0; i != gc->ngpio; ++i) {
>  		struct gpio_desc *gpio;
> @@ -621,7 +618,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
>  	INIT_LIST_HEAD(&gdev->pin_ranges);
>  #endif
>  
> -	ret = gpiochip_set_desc_names(gc);
> +	if (gc->names)
> +		ret = gpiochip_set_desc_names(gc);
> +	else
> +		ret = devprop_gpiochip_set_names(gc);
>  	if (ret)
>  		goto err_remove_from_list;
>  
> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> index d1cef5c2715c..56485a040b82 100644
> --- a/include/linux/gpio/driver.h
> +++ b/include/linux/gpio/driver.h
> @@ -756,8 +756,7 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
>  					    enum gpiod_flags dflags);
>  void gpiochip_free_own_desc(struct gpio_desc *desc);
>  
> -void devprop_gpiochip_set_names(struct gpio_chip *gc,
> -				const struct fwnode_handle *fwnode);
> +int devprop_gpiochip_set_names(struct gpio_chip *gc);
>  
>  #ifdef CONFIG_GPIOLIB
>  
> -- 
> 2.26.1
>
Bartosz Golaszewski Sept. 7, 2020, 10:56 a.m. UTC | #2 
On Fri, Sep 4, 2020 at 6:44 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Fri, Sep 04, 2020 at 05:45:28PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > devprop_gpiochip_set_names() is overly complicated with taking the
> > fwnode argument (which requires using dev_fwnode() & of_fwnode_handle()
> > in ACPI and OF GPIO code respectively). Let's just switch to using the
> > generic device properties.
> >
> > This allows us to pull the code setting line names directly into
> > gpiochip_add_data_with_key() instead of handling it separately for
> > ACPI and OF.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > ---
> >  drivers/gpio/gpiolib-acpi.c    |  3 ---
> >  drivers/gpio/gpiolib-devprop.c | 19 ++++++++++---------
> >  drivers/gpio/gpiolib-of.c      |  5 -----
> >  drivers/gpio/gpiolib.c         |  8 ++++----
> >  include/linux/gpio/driver.h    |  3 +--
> >  5 files changed, 15 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> > index 54ca3c18b291..834a12f3219e 100644
> > --- a/drivers/gpio/gpiolib-acpi.c
> > +++ b/drivers/gpio/gpiolib-acpi.c
> > @@ -1221,9 +1221,6 @@ void acpi_gpiochip_add(struct gpio_chip *chip)
> >               return;
> >       }
> >
> > -     if (!chip->names)
> > -             devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
> > -
> >       acpi_gpiochip_request_regions(acpi_gpio);
> >       acpi_gpiochip_scan_gpios(acpi_gpio);
> >       acpi_walk_dep_device_list(handle);
> > diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c
> > index 26741032fa9e..a28659b4f9c9 100644
> > --- a/drivers/gpio/gpiolib-devprop.c
> > +++ b/drivers/gpio/gpiolib-devprop.c
> > @@ -17,25 +17,24 @@
> >  /**
> >   * devprop_gpiochip_set_names - Set GPIO line names using device properties
> >   * @chip: GPIO chip whose lines should be named, if possible
> > - * @fwnode: Property Node containing the gpio-line-names property
> >   *
> >   * Looks for device property "gpio-line-names" and if it exists assigns
> >   * GPIO line names for the chip. The memory allocated for the assigned
> > - * names belong to the underlying firmware node and should not be released
> > + * names belong to the underlying software node and should not be released
> >   * by the caller.
> >   */
> > -void devprop_gpiochip_set_names(struct gpio_chip *chip,
> > -                             const struct fwnode_handle *fwnode)
> > +int devprop_gpiochip_set_names(struct gpio_chip *chip)
> >  {
> >       struct gpio_device *gdev = chip->gpiodev;
> > +     struct device *dev = chip->parent;
> >       const char **names;
> >       int ret, i;
> >       int count;
> >
> > -     count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
> > +     count = device_property_read_string_array(dev, "gpio-line-names",
> >                                                 NULL, 0);
> >       if (count < 0)
> > -             return;
> > +             return 0;
>
> Can we introduce a followup to 33ee09cd59ce ("device property: Add helpers to
> count items in an array") for strings?
>

Sure, I'll do this in v2.

Bart
diff mbox series

Patch

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 54ca3c18b291..834a12f3219e 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -1221,9 +1221,6 @@  void acpi_gpiochip_add(struct gpio_chip *chip)
 		return;
 	}
 
-	if (!chip->names)
-		devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
-
 	acpi_gpiochip_request_regions(acpi_gpio);
 	acpi_gpiochip_scan_gpios(acpi_gpio);
 	acpi_walk_dep_device_list(handle);
diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c
index 26741032fa9e..a28659b4f9c9 100644
--- a/drivers/gpio/gpiolib-devprop.c
+++ b/drivers/gpio/gpiolib-devprop.c
@@ -17,25 +17,24 @@ 
 /**
  * devprop_gpiochip_set_names - Set GPIO line names using device properties
  * @chip: GPIO chip whose lines should be named, if possible
- * @fwnode: Property Node containing the gpio-line-names property
  *
  * Looks for device property "gpio-line-names" and if it exists assigns
  * GPIO line names for the chip. The memory allocated for the assigned
- * names belong to the underlying firmware node and should not be released
+ * names belong to the underlying software node and should not be released
  * by the caller.
  */
-void devprop_gpiochip_set_names(struct gpio_chip *chip,
-				const struct fwnode_handle *fwnode)
+int devprop_gpiochip_set_names(struct gpio_chip *chip)
 {
 	struct gpio_device *gdev = chip->gpiodev;
+	struct device *dev = chip->parent;
 	const char **names;
 	int ret, i;
 	int count;
 
-	count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
+	count = device_property_read_string_array(dev, "gpio-line-names",
 						  NULL, 0);
 	if (count < 0)
-		return;
+		return 0;
 
 	if (count > gdev->ngpio) {
 		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
@@ -45,19 +44,21 @@  void devprop_gpiochip_set_names(struct gpio_chip *chip,
 
 	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
 	if (!names)
-		return;
+		return -ENOMEM;
 
-	ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
+	ret = device_property_read_string_array(dev, "gpio-line-names",
 						names, count);
 	if (ret < 0) {
 		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
 		kfree(names);
-		return;
+		return ret;
 	}
 
 	for (i = 0; i < count; i++)
 		gdev->descs[i].name = names[i];
 
 	kfree(names);
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index bd31dd3b6a75..2f895a2b8411 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -1026,11 +1026,6 @@  int of_gpiochip_add(struct gpio_chip *chip)
 	if (ret)
 		return ret;
 
-	/* If the chip defines names itself, these take precedence */
-	if (!chip->names)
-		devprop_gpiochip_set_names(chip,
-					   of_fwnode_handle(chip->of_node));
-
 	of_node_get(chip->of_node);
 
 	ret = of_gpiochip_scan_gpios(chip);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 80137c1b3cdc..0d390f0ec32c 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -340,9 +340,6 @@  static int gpiochip_set_desc_names(struct gpio_chip *gc)
 	struct gpio_device *gdev = gc->gpiodev;
 	int i;
 
-	if (!gc->names)
-		return 0;
-
 	/* First check all names if they are unique */
 	for (i = 0; i != gc->ngpio; ++i) {
 		struct gpio_desc *gpio;
@@ -621,7 +618,10 @@  int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	INIT_LIST_HEAD(&gdev->pin_ranges);
 #endif
 
-	ret = gpiochip_set_desc_names(gc);
+	if (gc->names)
+		ret = gpiochip_set_desc_names(gc);
+	else
+		ret = devprop_gpiochip_set_names(gc);
 	if (ret)
 		goto err_remove_from_list;
 
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index d1cef5c2715c..56485a040b82 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -756,8 +756,7 @@  struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
 					    enum gpiod_flags dflags);
 void gpiochip_free_own_desc(struct gpio_desc *desc);
 
-void devprop_gpiochip_set_names(struct gpio_chip *gc,
-				const struct fwnode_handle *fwnode);
+int devprop_gpiochip_set_names(struct gpio_chip *gc);
 
 #ifdef CONFIG_GPIOLIB