diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile index 7aa703e938c0bb..05661168a7bf9a 100644 --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -31,6 +31,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ googlevoicehat-soundcard.dtbo \ gpio-ir.dtbo \ gpio-ir-tx.dtbo \ + gpio-key.dtbo \ gpio-poweroff.dtbo \ gpio-shutdown.dtbo \ hifiberry-amp.dtbo \ diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README index b8a2f3fdf73299..2ad2397348e8fd 100644 --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -515,6 +515,27 @@ Params: gpio_pin Output GPIO (default 18) Default is "0" (active-high). +Name: gpio-key +Info: This is a generic overlay for activating GPIO keypresses using + the gpio-keys library and this dtoverlay. Multiple keys can be + set up using multiple calls to the overlay for configuring + additional buttons or joysticks. You can see available keycodes + at https://github.com/torvalds/linux/blob/v4.12/include/uapi/ + linux/input-event-codes.h#L64 +Load: dtoverlay=gpio-key,= +Params: gpio GPIO pin to trigger on (default 3) + active_low When this is 1 (active low), a falling + edge generates a key down event and a + rising edge generates a key up event. + When this is 0 (active high), this is + reversed. The default is 1 (active low) + gpio_pull Desired pull-up/down state (off, down, up) + Default is "up". Note that the default pin + (GPIO3) has an external pullup + label Set a label for the key + keycode Set the key code for the button + + Name: gpio-poweroff Info: Drives a GPIO high or low on poweroff (including halt). Enabling this overlay will prevent the ability to boot by driving GPIO3 low. diff --git a/arch/arm/boot/dts/overlays/gpio-key-overlay.dts b/arch/arm/boot/dts/overlays/gpio-key-overlay.dts new file mode 100644 index 00000000000000..333d016d6f0298 --- /dev/null +++ b/arch/arm/boot/dts/overlays/gpio-key-overlay.dts @@ -0,0 +1,48 @@ +// Definitions for gpio-key module +/dts-v1/; +/plugin/; + +/ { + compatible = "brcm,bcm2708"; + + fragment@0 { + // Configure the gpio pin controller + target = <&gpio>; + __overlay__ { + pin_state: button_pins@0 { + brcm,pins = <3>; // gpio number + brcm,function = <0>; // 0 = input, 1 = output + brcm,pull = <2>; // 0 = none, 1 = pull down, 2 = pull up + }; + }; + }; + fragment@1 { + target-path = "/"; + __overlay__ { + button: button@0 { + compatible = "gpio-keys"; + pinctrl-names = "default"; + pinctrl-0 = <&pin_state>; + status = "okay"; + + key: key { + linux,code = <116>; + gpios = <&gpio 3 1>; + label = "KEY_POWER"; + }; + }; + }; + }; + + __overrides__ { + gpio = <&key>,"gpios:4", + <&button>,"reg:0", + <&pin_state>,"brcm,pins:0", + <&pin_state>,"reg:0"; + label = <&key>,"label"; + keycode = <&key>,"linux,code:0"; + gpio_pull = <&pin_state>,"brcm,pull:0"; + active_low = <&key>,"gpios:8"; + }; + +};