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dm: led: Support "default-state" property

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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>
This commit is contained in:
Patrick Bruenn 2018-04-11 11:16:27 +02:00 committed by Tom Rini
parent 732bc7ce3f
commit d90f0d4cae
1 changed files with 15 additions and 1 deletions
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16
drivers/led/led_gpio.c
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@ -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)