leds: leds-gpio: add retain-state-suspended property

Some gpio-leds need retain the state even in suspend, such as charger led. But this property missed in devicetree, add it. (cooloney@gmail.com: fold DT binding updates into this patch) Signed-off-by: Robin Gong <b38343@freescale.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>

leds: leds-gpio: add retain-state-suspended property
Some gpio-leds need retain the state even in suspend, such as charger led. But this property missed in devicetree, add it. (cooloney@gmail.com: fold DT binding updates into this patch) Signed-off-by: Robin Gong <b38343@freescale.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Robin Gong · Bryan Wu
1 parent 25c6579f87
Showing 2 changed files with 15 additions and 0 deletions Side-by-side Diff
Documentation/devicetree/bindings/leds/leds-gpio.txt
drivers/leds/leds-gpio.c
@@ -21,6 +21,8 @@
   on).  The "keep" setting will keep the LED at whatever its current
   state is, without producing a glitch.  The default is off if this
   property is not present.
+- retain-state-suspended: (optional) The suspend state can be retained.Such
+  as charge-led gpio.
  
 Examples:
  
@@ -48,6 +50,16 @@
 	green {
 		gpios = <&mpc8572 7 0>;
 		default-state = "on";
+	};
+};
+
+leds {
+	compatible = "gpio-leds";
+
+	charger-led {
+		gpios = <&gpio1 2 0>;
+		linux,default-trigger = "max8903-charger-charging";
+		retain-state-suspended;
 	};
 };
@@ -204,6 +204,9 @@
 				led.default_state = LEDS_GPIO_DEFSTATE_OFF;
 		}
  
+		if (of_get_property(child, "retain-state-suspended", NULL))
+			led.retain_state_suspended = 1;
+
 		ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
 				      &pdev->dev, NULL);
 		if (ret < 0) {
...	...	@@ -21,6 +21,8 @@
21	21	on). The "keep" setting will keep the LED at whatever its current
22	22	state is, without producing a glitch. The default is off if this
23	23	property is not present.
	24	+- retain-state-suspended: (optional) The suspend state can be retained.Such
	25	+ as charge-led gpio.
24	26
25	27	Examples:
26	28
...	...	@@ -48,6 +50,16 @@
48	50	green {
49	51	gpios = <&mpc8572 7 0>;
50	52	default-state = "on";
	53	+ };
	54	+};
	55	+
	56	+leds {
	57	+ compatible = "gpio-leds";
	58	+
	59	+ charger-led {
	60	+ gpios = <&gpio1 2 0>;
	61	+ linux,default-trigger = "max8903-charger-charging";
	62	+ retain-state-suspended;
51	63	};
52	64	};
...	...	@@ -204,6 +204,9 @@
204	204	led.default_state = LEDS_GPIO_DEFSTATE_OFF;
205	205	}
206	206
	207	+ if (of_get_property(child, "retain-state-suspended", NULL))
	208	+ led.retain_state_suspended = 1;
	209	+
207	210	ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
208	211	&pdev->dev, NULL);
209	212	if (ret < 0) {