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Date: Fri, 4 Sep 2020 19:38:20 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Jonathan Corbet <corbet@....net>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 04/23] gpiolib: generalize devprop_gpiochip_set_names()
for device properties
On Fri, Sep 04, 2020 at 05:45:28PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.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@...libre.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
>
--
With Best Regards,
Andy Shevchenko
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