three pulled gpio buttons (for pins without irq)

diff --git a/device-tree/gpio-3-buttons.dts b/device-tree/gpio-3-buttons.dts
new file mode 100644 (file)
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 */
+                               };
+                       };
+               };
+       };
+};