On Wed, Jan 07, 2015 at 10:08:40AM +0100, Olliver Schinagl wrote:
> From: Olliver Schinagl <oliver@xxxxxxxxxxx>
>
> The gpio binding document says that new code should always use named
> gpios. Patch 40b73183 added support to parse a list of gpios from child
> nodes, but does not make it possible to use named gpios. This patch adds
> the con_id property and implements it is done in gpiolib.c, where the
> old-style of using unnamed gpios still works.
>
> Signed-off-by: Olliver Schinagl <oliver@xxxxxxxxxxx>
> ---
> drivers/gpio/devres.c | 16 +++++++++++++++-
> drivers/input/keyboard/gpio_keys_polled.c | 2 +-
> drivers/leds/leds-gpio.c | 2 +-
> include/linux/gpio/consumer.h | 1 +
> 4 files changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
> index 13dbd3d..b7fbe1c 100644
> --- a/drivers/gpio/devres.c
> +++ b/drivers/gpio/devres.c
> @@ -111,23 +111,37 @@ EXPORT_SYMBOL(__devm_gpiod_get_index);
> /**
> * devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node
> * @dev: GPIO consumer
> + * @con_id: function within the GPIO consumer
> * @child: firmware node (child of @dev)
> *
> * GPIO descriptors returned from this function are automatically disposed on
> * driver detach.
> */
> struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
> + const char *con_id,
> struct fwnode_handle *child)
> {
> + static const char const *suffixes[] = { "gpios", "gpio" };
> + char prop_name[32]; /* 32 is max size of property name */
> struct gpio_desc **dr;
> struct gpio_desc *desc;
> + unsigned int i;
>
> dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
> GFP_KERNEL);
> if (!dr)
> return ERR_PTR(-ENOMEM);
>
> - desc = fwnode_get_named_gpiod(child, "gpios");
> + for (i = 0; i < ARRAY_SIZE(suffixes); i++) {
> + if (con_id)
> + snprintf(prop_name, 32, "%s-%s", con_id, suffixes[i]);
sizeof(prop_name) instead of hard-coding 32 would be better.
> + else
> + snprintf(prop_name, 32, "%s", suffixes[i]);
> +
> + desc = fwnode_get_named_gpiod(child, prop_name);
> + if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
> + break;
> + }
> if (IS_ERR(desc)) {
> devres_free(dr);
> return desc;
> diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
> index 90df4df..097d721 100644
> --- a/drivers/input/keyboard/gpio_keys_polled.c
> +++ b/drivers/input/keyboard/gpio_keys_polled.c
> @@ -125,7 +125,7 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
> device_for_each_child_node(dev, child) {
> struct gpio_desc *desc;
>
> - desc = devm_get_gpiod_from_child(dev, child);
> + desc = devm_get_gpiod_from_child(dev, NULL, child);
I guess the number of users is small enough that we can do this API
change in one step if gpio overlords are happy with it.
> if (IS_ERR(desc)) {
> error = PTR_ERR(desc);
> if (error != -EPROBE_DEFER)
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index 7ea1ea42..8e5af69 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -184,7 +184,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
> struct gpio_led led = {};
> const char *state = NULL;
>
> - led.gpiod = devm_get_gpiod_from_child(dev, child);
> + led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);
> if (IS_ERR(led.gpiod)) {
> fwnode_handle_put(child);
> goto err;
> diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
> index 45afc2d..ed20759 100644
> --- a/include/linux/gpio/consumer.h
> +++ b/include/linux/gpio/consumer.h
> @@ -110,6 +110,7 @@ struct fwnode_handle;
> struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
> const char *propname);
> struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
> + const char *con_id,
> struct fwnode_handle *child);
> #else /* CONFIG_GPIOLIB */
>
> --
> 2.1.4
>
Thanks.
--
Dmitry
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