From 4fc30b61eb00fe1c9a02fece1e7e516719a03a91 Mon Sep 17 00:00:00 2001
From: Dobrica Pavlinusic <dpavlin@rot13.org>
Date: Sat, 2 Dec 2017 12:28:17 +0100
Subject: [PATCH] three pulled gpio buttons (for pins without irq)

---
 device-tree/gpio-3-buttons.dts | 61 ++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 device-tree/gpio-3-buttons.dts

diff --git a/device-tree/gpio-3-buttons.dts b/device-tree/gpio-3-buttons.dts
new file mode 100644
index 0000000..450325d
--- /dev/null
+++ b/device-tree/gpio-3-buttons.dts
@@ -0,0 +1,61 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun50i-a64", "allwinner,sun50i-h5";
+
+	/*
+	 * This fragment is needed only for the internal pull-up activation,
+	 * external pull-up resistor is highly recommended if using long wires
+	 */
+
+	fragment@0 {
+		target = <&pio>;
+		__overlay__ {
+			gpio_button_0: gpio_button_0 {
+				pins = "PG9","PG10","PG11";
+				function = "gpio_in";
+				bias-pull-up;
+			};
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			gpio-3-buttons {
+				/*
+				 * Use "gpio-keys" for EINT capable pins, "gpio-keys-polled" for other pins
+				 * add "poll-interval" property if using "gpio-keys-polled"
+				 */
+/*
+				compatible = "gpio-keys";
+*/
+				compatible = "gpio-keys-polled";
+				poll-interval = <100>;
+				autorepeat;
+
+				pinctrl-names = "default";
+				pinctrl-0 = <&gpio_button_0>;
+
+				up {
+					label = "button-up";
+					linux,code = <103>; /* KEY_UP, see include/uapi/linux/input-event-codes.h */
+					gpios = <&pio 6 9 1>; /* PG9 GPIO_ACTIVE_LOW */
+				};
+
+				down {
+					label = "button-down";
+					linux,code = <108>; /* KEY_DOWN, see include/uapi/linux/input-event-codes.h */
+					gpios = <&pio 6 10 1>; /* PG10 GPIO_ACTIVE_LOW */
+				};
+
+				enter {
+					label = "button-enter";
+					linux,code = <28>; /* KEY_DOWN, see include/uapi/linux/input-event-codes.h */
+					gpios = <&pio 6 11 1>; /* PG11 GPIO_ACTIVE_LOW */
+				};
+			};
+		};
+	};
+};
-- 
2.20.1