leds: syscon: 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>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230103131256.33894-11-andriy.shevchenko@linux.intel.com

drivers/leds/leds-syscon.c

@@ -61,7 +61,8 @@ static int syscon_led_probe(struct platform_device *pdev)
 	struct device *parent;
 	struct regmap *map;
 	struct syscon_led *sled;
-	const char *state;
+	enum led_default_state state;
+	u32 value;
 	int ret;
 
 	parent = dev->parent;
@@ -86,34 +87,30 @@ static int syscon_led_probe(struct platform_device *pdev)
 	if (of_property_read_u32(np, "mask", &sled->mask))
 		return -EINVAL;
 
-	state = of_get_property(np, "default-state", NULL);
-	if (state) {
-		if (!strcmp(state, "keep")) {
-			u32 val;
-
-			ret = regmap_read(map, sled->offset, &val);
-			if (ret < 0)
-				return ret;
-			sled->state = !!(val & sled->mask);
-		} else if (!strcmp(state, "on")) {
-			sled->state = true;
-			ret = regmap_update_bits(map, sled->offset,
-						 sled->mask,
-						 sled->mask);
-			if (ret < 0)
-				return ret;
-		} else {
-			sled->state = false;
-			ret = regmap_update_bits(map, sled->offset,
-						 sled->mask, 0);
-			if (ret < 0)
-				return ret;
-		}
+	init_data.fwnode = of_fwnode_handle(np);
+
+	state = led_init_default_state_get(init_data.fwnode);
+	switch (state) {
+	case LEDS_DEFSTATE_ON:
+		ret = regmap_update_bits(map, sled->offset, sled->mask, sled->mask);
+		if (ret < 0)
+			return ret;
+		sled->state = true;
+		break;
+	case LEDS_DEFSTATE_KEEP:
+		ret = regmap_read(map, sled->offset, &value);
+		if (ret < 0)
+			return ret;
+		sled->state = !!(value & sled->mask);
+		break;
+	default:
+		ret = regmap_update_bits(map, sled->offset, sled->mask, 0);
+		if (ret < 0)
+			return ret;
+		sled->state = false;
 	}
 	sled->cdev.brightness_set = syscon_led_set;
 
-	init_data.fwnode = of_fwnode_handle(np);
-
 	ret = devm_led_classdev_register_ext(dev, &sled->cdev, &init_data);
 	if (ret < 0)
 		return ret;