leds: bcm6328: Get rid of custom led_init_default_state_get()

LED core provides a helper to parse default state from firmware node.
Use it instead of custom implementation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230103131256.33894-5-andriy.shevchenko@linux.intel.com

Author: andy-shev

drivers/leds/leds-bcm6328.c

@@ -330,7 +330,9 @@ static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
 {
 	struct led_init_data init_data = {};
 	struct bcm6328_led *led;
-	const char *state;
+	enum led_default_state state;
+	unsigned long val, shift;
+	void __iomem *mode;
 	int rc;
 
 	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
@@ -346,39 +348,36 @@ static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
 	if (of_property_read_bool(nc, "active-low"))
 		led->active_low = true;
 
-	if (!of_property_read_string(nc, "default-state", &state)) {
-		if (!strcmp(state, "on")) {
+	init_data.fwnode = of_fwnode_handle(nc);
+
+	state = led_init_default_state_get(init_data.fwnode);
+	switch (state) {
+	case LEDS_DEFSTATE_ON:
+		led->cdev.brightness = LED_FULL;
+		break;
+	case LEDS_DEFSTATE_KEEP:
+		shift = bcm6328_pin2shift(led->pin);
+		if (shift / 16)
+			mode = mem + BCM6328_REG_MODE_HI;
+		else
+			mode = mem + BCM6328_REG_MODE_LO;
+
+		val = bcm6328_led_read(mode) >> BCM6328_LED_SHIFT(shift % 16);
+		val &= BCM6328_LED_MODE_MASK;
+		if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
+		    (!led->active_low && val == BCM6328_LED_MODE_ON))
 			led->cdev.brightness = LED_FULL;
-		} else if (!strcmp(state, "keep")) {
-			void __iomem *mode;
-			unsigned long val, shift;
-
-			shift = bcm6328_pin2shift(led->pin);
-			if (shift / 16)
-				mode = mem + BCM6328_REG_MODE_HI;
-			else
-				mode = mem + BCM6328_REG_MODE_LO;
-
-			val = bcm6328_led_read(mode) >>
-			      BCM6328_LED_SHIFT(shift % 16);
-			val &= BCM6328_LED_MODE_MASK;
-			if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
-			    (!led->active_low && val == BCM6328_LED_MODE_ON))
-				led->cdev.brightness = LED_FULL;
-			else
-				led->cdev.brightness = LED_OFF;
-		} else {
+		else
 			led->cdev.brightness = LED_OFF;
-		}
-	} else {
+		break;
+	default:
 		led->cdev.brightness = LED_OFF;
 	}
 
 	bcm6328_led_set(&led->cdev, led->cdev.brightness);
 
 	led->cdev.brightness_set = bcm6328_led_set;
 	led->cdev.blink_set = bcm6328_blink_set;
-	init_data.fwnode = of_fwnode_handle(nc);
 
 	rc = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
 	if (rc < 0)