From: Patrick Bruenn <p.bruenn@beckhoff.com>
Date: Wed, 11 Apr 2018 09:16:27 +0000 (+0200)
Subject: dm: led: Support "default-state" property
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=d90f0d4cae5c9349a412e3f924bf25e20e35ddfa;p=u-boot.git

dm: led: Support "default-state" property

Add support for the device tree property "default-state". This feature
might be useful for LEDs indicating "power on" or similar states.

Note: Even with this commit gpio-leds remain in reset state. That's
because the led_gpio is not probed until DM_FLAG_ACTIVATED is set.

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
---

diff --git a/drivers/led/led_gpio.c b/drivers/led/led_gpio.c
index b26f7a730c..533587dc47 100644
--- a/drivers/led/led_gpio.c
+++ b/drivers/led/led_gpio.c
@@ -57,11 +57,25 @@ static int led_gpio_probe(struct udevice *dev)
 {
 	struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
 	struct led_gpio_priv *priv = dev_get_priv(dev);
+	const char *default_state;
+	int ret;
 
 	/* Ignore the top-level LED node */
 	if (!uc_plat->label)
 		return 0;
-	return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
+
+	ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
+	if (ret)
+		return ret;
+
+	default_state = dev_read_string(dev, "default-state");
+	if (default_state) {
+		if (!strncmp(default_state, "on", 2))
+			gpio_led_set_state(dev, LEDST_ON);
+		else if (!strncmp(default_state, "off", 3))
+			gpio_led_set_state(dev, LEDST_OFF);
+	}
+	return 0;
 }
 
 static int led_gpio_remove(struct udevice *dev)