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>

2 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt
index df1b3080f6b8..f77148f372ea 100644
--- a/Documentation/devicetree/bindings/leds/leds-gpio.txt
+++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt
@@ -21,6 +21,8 @@ LED sub-node properties:
   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:
 
@@ -50,3 +52,13 @@ run-control {
                 default-state = "on";
         };
 };
+
+leds {
+        compatible = "gpio-leds";
+
+        charger-led {
+                gpios = <&gpio1 2 0>;
+                linux,default-trigger = "max8903-charger-charging";
+                retain-state-suspended;
+        };
+};
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 78b0e273a903..1bb3f1ab1d91 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -204,6 +204,9 @@ static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
                                 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) {