From d90f0d4cae5c9349a412e3f924bf25e20e35ddfa Mon Sep 17 00:00:00 2001 From: Patrick Bruenn Date: Wed, 11 Apr 2018 11:16:27 +0200 Subject: [PATCH] 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 --- drivers/led/led_gpio.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) 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) -- 2.39.5