Minor fixes on labels for GPIO and PWM LEDs

drivers/led/led_pwm.c

@@ -232,13 +232,9 @@ static const struct led_pwm_config led_pwm_config_##id = {	\
 								\
 static struct led_pwm_data led_pwm_data_##id;			\
 								\
-DEVICE_DEFINE(led_pwm_##id,					\
-		    DT_INST_PROP_OR(id, label, "LED_PWM_"#id),	\
-		    &led_pwm_init,				\
-		    led_pwm_pm_control,				\
-		    &led_pwm_data_##id,				\
-		    &led_pwm_config_##id,			\
-		    POST_KERNEL, CONFIG_LED_INIT_PRIORITY,	\
-		    &led_pwm_api);
+DEVICE_DT_INST_DEFINE(id, &led_pwm_init, led_pwm_pm_control,	\
+		      &led_pwm_data_##id, &led_pwm_config_##id,	\
+		      POST_KERNEL, CONFIG_LED_INIT_PRIORITY,	\
+		      &led_pwm_api);
 
 DT_INST_FOREACH_STATUS_OKAY(LED_PWM_DEVICE)

dts/bindings/gpio/gpio-leds.yaml

@@ -5,13 +5,28 @@ description: GPIO LEDs parent node
 
 compatible: "gpio-leds"
 
+include:
+    - name: base.yaml
+      property-allowlist: [label]
+
+properties:
+    label:
+      description: |
+        Human readable string describing the device and used to set the device
+        name. It can be passed as argument to device_get_binding() to retrieve
+        the device. If this property is omitted, then the device name is set
+        from the node full name.
+
 child-binding:
     description: GPIO LED child node
     properties:
        gpios:
           type: phandle-array
           required: true
        label:
-          required: true
+          required: false
           type: string
-          description: Human readable string describing the device (used as device_get_binding() argument)
+          description: |
+            Human readable string describing the LED. It can be used by an
+            application to identify this LED or to retrieve its number/index
+            (i.e. child node number) on the parent device.

dts/bindings/led/pwm-leds.yaml

@@ -5,14 +5,29 @@ description: PWM LEDs parent node
 
 compatible: "pwm-leds"
 
+include:
+    - name: base.yaml
+      property-allowlist: [label]
+
+properties:
+    label:
+      description: |
+        Human readable string describing the device and used to set the device
+        name. It can be passed as argument to device_get_binding() to retrieve
+        the device. If this property is omitted, then the device name is set
+        from the node full name.
+
 child-binding:
     description: PWM LED child node
     properties:
         pwms:
-          type: phandle-array
           required: true
+          type: phandle-array
 
         label:
           required: false
           type: string
-          description: Human readable string describing the device (used as device_get_binding() argument)
+          description: |
+            Human readable string describing the LED. It can be used by an
+            application to identify this LED or to retrieve its number/index
+            (i.e. child node number) on the parent device.

samples/drivers/led_pwm/src/main.c

@@ -15,7 +15,7 @@ LOG_MODULE_REGISTER(main, CONFIG_LOG_DEFAULT_LEVEL);
 
 #if DT_NODE_HAS_STATUS(DT_INST(0, pwm_leds), okay)
 #define LED_PWM_NODE_ID		DT_INST(0, pwm_leds)
-#define LED_PWM_DEV_NAME	DT_INST_PROP_OR(0, label, "LED_PWM_0")
+#define LED_PWM_DEV_NAME	DEVICE_DT_NAME(LED_PWM_NODE_ID)
 #else
 #error "No LED PWM device found"
 #endif