| LEDs connected to GPIO lines |
| |
| Required properties: |
| - compatible : should be "gpio-leds". |
| |
| Each LED is represented as a sub-node of the gpio-leds device. Each |
| node's name represents the name of the corresponding LED. |
| |
| LED sub-node properties: |
| - gpios : Should specify the LED's GPIO, see "gpios property" in |
| Documentation/devicetree/bindings/gpio/gpio.txt. Active low LEDs should be |
| indicated using flags in the GPIO specifier. |
| - label : (optional) |
| see Documentation/devicetree/bindings/leds/common.txt |
| - linux,default-trigger : (optional) |
| see Documentation/devicetree/bindings/leds/common.txt |
| - default-state: (optional) The initial state of the LED. |
| see Documentation/devicetree/bindings/leds/common.txt |
| - retain-state-suspended: (optional) The suspend state can be retained.Such |
| as charge-led gpio. |
| - panic-indicator : (optional) |
| see Documentation/devicetree/bindings/leds/common.txt |
| |
| Examples: |
| |
| #include <dt-bindings/gpio/gpio.h> |
| |
| leds { |
| compatible = "gpio-leds"; |
| hdd { |
| label = "Disk Activity"; |
| gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>; |
| linux,default-trigger = "disk-activity"; |
| }; |
| |
| fault { |
| gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>; |
| /* Keep LED on if BIOS detected hardware fault */ |
| default-state = "keep"; |
| }; |
| }; |
| |
| run-control { |
| compatible = "gpio-leds"; |
| red { |
| gpios = <&mpc8572 6 GPIO_ACTIVE_HIGH>; |
| default-state = "off"; |
| }; |
| green { |
| gpios = <&mpc8572 7 GPIO_ACTIVE_HIGH>; |
| default-state = "on"; |
| }; |
| }; |
| |
| leds { |
| compatible = "gpio-leds"; |
| |
| charger-led { |
| gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>; |
| linux,default-trigger = "max8903-charger-charging"; |
| retain-state-suspended; |
| }; |
| }; |