From: Patrick Bruenn <p.bru...@beckhoff.com>
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.bru...@beckhoff.com>
---
Changes in v4:
- don't break 'make tests'
- rebased on 2600df4f8ef12ece9cec13030005919e0ba2b0d5 (master
2018-04-09)
Changes in v3:
- use ofnode_read_bool() instead of ofnode_read_string() to determine if
LED node has the default-state property
Changes in v2:
- rebase to v2018.05-rc1
- add dm_test_led_default_state() to tests/dm/led.c
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 9976635887..e68d8d3864 100644
--- a/drivers/led/led_gpio.c
+++ b/drivers/led/led_gpio.c
@@ -60,11 +60,25 @@ 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)
--
2.11.0
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