ARM: dts: koelsch: Add overlay for keyboard-controlled LED
Add a Device Tree Overlay to describe a keyboard-controlled LED using
the GPIO Aggregator.
As these GPIOS are used by the normal keyboard and LEDS, these are
disabled first.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
diff --git a/arch/arm/boot/dts/r8a7791-koelsch-keyboard-controlled-led.dtso b/arch/arm/boot/dts/r8a7791-koelsch-keyboard-controlled-led.dtso
new file mode 100644
index 0000000..91c8d7c
--- /dev/null
+++ b/arch/arm/boot/dts/r8a7791-koelsch-keyboard-controlled-led.dtso
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Device Tree Overlay describing a keyboard-controlled LED using the GPIO
+// Aggregator
+//
+// Copyright (C) 2021 Glider bv
+//
+// Note:
+// As these GPIOS are used by the normal keyboard and LEDS, these are
+// disabled first.
+//
+// Usage:
+// $ overlay add r8a7791-koelsch-keyboard-controlled-led
+// $ echo gpio-aggregator > /sys/devices/platform/frobnicator/driver_override
+// $ echo frobnicator > /sys/bus/platform/drivers/gpio-aggregator/bind
+//
+// $ gpioinfo frobnicator
+// gpiochip12 - 3 lines:
+// line 0: "light" "light" output active-high [used]
+// line 1: "on" "On" input active-low [used]
+// line 2: "off" "Off" input active-low [used]
+//
+// $ echo 255 > /sys/class/leds/light/brightness
+// $ echo 0 > /sys/class/leds/light/brightness
+//
+// $ evtest /dev/input/event0
+//
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&{/} {
+ keyboard {
+ status = "disabled";
+ };
+
+ leds {
+ status = "disabled";
+ };
+
+ frobnicator: frobnicator {
+ compatible = "glider,keyboard-controlled-led";
+
+ gpios = <&gpio2 19 GPIO_ACTIVE_HIGH>,
+ <&gpio7 2 GPIO_ACTIVE_HIGH>,
+ <&gpio7 6 GPIO_ACTIVE_HIGH>;
+ gpio-line-names = "light", "on", "off";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ new_keyboard {
+ compatible = "gpio-keys";
+
+ pinctrl-0 = <&new_keyboard_pins>;
+ pinctrl-names = "default";
+
+ key-X {
+ gpios = <&frobnicator 1 GPIO_ACTIVE_LOW>;
+ linux,code = <KEY_X>;
+ label = "On";
+ wakeup-source;
+ debounce-interval = <20>;
+ };
+ key-O {
+ gpios = <&frobnicator 2 GPIO_ACTIVE_LOW>;
+ linux,code = <KEY_O>;
+ label = "Off";
+ wakeup-source;
+ debounce-interval = <20>;
+ };
+ };
+
+ new_leds {
+ compatible = "gpio-leds";
+
+ light {
+ gpios = <&frobnicator 0 GPIO_ACTIVE_HIGH>;
+ };
+ };
+};
+
+&pfc {
+ new_keyboard_pins: new_keyboard_pins {
+ pins = "GP_7_2", "GP_7_6";
+ bias-pull-up;
+ };
+};
