[PATCH v4 2/2] led: Add dts property to specify blinking of the led

[Mikhail Kshevetskiy]

From: Michael Polyntsov <michael.polyntsov at iopsys.eu>

The standard property

    linux,default-trigger = "pattern";

used to get an effect. No blinking parameters can be set yet.

Signed-off-by: Michael Polyntsov <michael.polyntsov at iopsys.eu>
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 drivers/led/led-uclass.c | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c
index 03907a12407..6f5315e0fb8 100644
--- a/drivers/led/led-uclass.c
+++ b/drivers/led/led-uclass.c
@@ -98,6 +98,9 @@ static int led_post_bind(struct udevice *dev)
 {
 	struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
 	const char *default_state;
+#ifdef CONFIG_LED_BLINK
+	const char *trigger;
+#endif
 
 	if (!uc_plat->label)
 		uc_plat->label = dev_read_string(dev, "label");
@@ -118,6 +121,12 @@ static int led_post_bind(struct udevice *dev)
 	else
 		return 0;
 
+#ifdef CONFIG_LED_BLINK
+	trigger = dev_read_string(dev, "linux,default-trigger");
+	if (trigger && !strncmp(trigger, "pattern", 7))
+		uc_plat->default_state = LEDST_BLINK;
+#endif
+
 	/*
 	 * In case the LED has default-state DT property, trigger
 	 * probe() to configure its default state during startup.
@@ -130,12 +139,28 @@ static int led_post_bind(struct udevice *dev)
 static int led_post_probe(struct udevice *dev)
 {
 	struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
+	int rc = 0;
 
-	if (uc_plat->default_state == LEDST_ON ||
-	    uc_plat->default_state == LEDST_OFF)
-		led_set_state(dev, uc_plat->default_state);
+	switch (uc_plat->default_state) {
+	case LEDST_ON:
+	case LEDST_OFF:
+		rc = led_set_state(dev, uc_plat->default_state);
+		break;
+#ifdef CONFIG_LED_BLINK
+	case LEDST_BLINK: {
+		const int default_period_ms = 1000;
 
-	return 0;
+		rc = led_set_period(dev, default_period_ms);
+		if (rc == 0)
+			rc = led_set_state(dev, uc_plat->default_state);
+		break;
+	}
+#endif
+	default:
+		break;
+	}
+
+	return rc;
 }
 
 UCLASS_DRIVER(led) = {
-- 
2.39.2