leds: pwm: Allow automatic labels for DT based devices

If LEDs are configured through device tree and the property 'label' is
omitted, the label is supposed to be generated from the properties
'function' and 'color' if present.  While this works fine for e.g. the
'leds-gpio' driver, it did not for 'leds-pwm'.

The reason is, you get this label naming magic only if you add a LED
device through 'devm_led_classdev_register_ext()' and pass a pointer to
the current device tree node.

For the following node from dts the LED appeared as 'led-5' in sysfs
before and as 'red:debug' after this change.

        pwm_leds {
                compatible = "pwm-leds";

                led-5 {
                        function = LED_FUNCTION_DEBUG;
                        color = <LED_COLOR_ID_RED>;
                        pwms = <&pwm0 2 10000000 0>;
                        max-brightness = <127>;

                        linux,default-trigger = "heartbeat";
                        panic-indicator;
                };
        };

Signed-off-by: Alexander Dahl <post@lespocky.de>
Cc: Marek Behún <marek.behun@nic.cz>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index e35a97c1d828514b9631e5079c22a50f402501ee..4a014d2964123b897f08bf961dcb96f213da7819 100644 (file)
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -65,6 +65,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
                       struct led_pwm *led, struct fwnode_handle *fwnode)
 {
        struct led_pwm_data *led_data = &priv->leds[priv->num_leds];
+       struct led_init_data init_data = { .fwnode = fwnode };
        int ret;
 
        led_data->active_low = led->active_low;
@@ -87,7 +88,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 
        pwm_init_state(led_data->pwm, &led_data->pwmstate);
 
-       ret = devm_led_classdev_register(dev, &led_data->cdev);
+       ret = devm_led_classdev_register_ext(dev, &led_data->cdev, &init_data);
        if (ret) {
                dev_err(dev, "failed to register PWM led for %s: %d\n",
                        led->name, ret);