diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0157-add-gpio-key-overlay-2329.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0157-add-gpio-key-overlay-2329.patch | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0157-add-gpio-key-overlay-2329.patch b/target/linux/brcm2708/patches-4.14/950-0157-add-gpio-key-overlay-2329.patch new file mode 100644 index 0000000000..f486ece958 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0157-add-gpio-key-overlay-2329.patch @@ -0,0 +1,104 @@ +From e8a650fc27bf1e7d858c997fddd9944e6c222260 Mon Sep 17 00:00:00 2001 +From: Aaron Shaw <shawaj@gmail.com> +Date: Thu, 4 Jan 2018 15:02:16 +0000 +Subject: [PATCH 157/454] add gpio-key overlay (#2329) + +An overlay that allows a Linux key to be bound to a GPIO. +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 21 ++++++++ + .../boot/dts/overlays/gpio-key-overlay.dts | 48 +++++++++++++++++++ + 3 files changed, 70 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/gpio-key-overlay.dts + +--- 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 \ +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -515,6 +515,27 @@ Params: gpio_pin Output G + 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,<param>=<val> ++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. +--- /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"; ++ }; ++ ++}; |