EPSON-B184 4 buttons and dual-color led from dot-matrix printer

diff --git a/device-tree/EPSON-B184.dts b/device-tree/EPSON-B184.dts
new file mode 100644 (file)
index 0000000..1b10129
--- /dev/null
+++ b/device-tree/EPSON-B184.dts
@@ -0,0 +1,69 @@
+/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
+        *
+        * if you connect vcc to keyboard board, remote this fragment!
+        */
+
+       fragment@0 {
+               target = <&pio>;
+               __overlay__ {
+                       gpio_button_0: gpio_button_0 {
+                               pins = "PE11","PE10","PE9", "PE8";
+                               function = "gpio_in";
+                               bias-pull-up;
+                       };
+               };
+       };
+
+       fragment@1 {
+               target-path = "/";
+               __overlay__ {
+                       EPSON-B184 {
+                               /*
+                                * 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>;
+
+                               kp_1 {
+                                       label = "Keypad 1";
+                                       linux,code = <79>; /* KEY_KP1, see include/uapi/linux/input-event-codes.h */
+                                       gpios = <&pio 4 11 1>; /* PE11 GPIO_ACTIVE_LOW */
+                               };
+
+                               kp_2 {
+                                       label = "Keypad 2";
+                                       linux,code = <80>; /* KEY_KP2, see include/uapi/linux/input-event-codes.h */
+                                       gpios = <&pio 4 10 1>; /* PE10 GPIO_ACTIVE_LOW */
+                               };
+
+                               kp_3 {
+                                       label = "Keypad 3";
+                                       linux,code = <81>; /* KEY_KP3, see include/uapi/linux/input-event-codes.h */
+                                       gpios = <&pio 4 9 1>; /* PE9 GPIO_ACTIVE_LOW */
+                               };
+
+                               kp_4 {
+                                       label = "Keypad 4";
+                                       linux,code = <82>; /* KEY_KP4, see include/uapi/linux/input-event-codes.h */
+                                       gpios = <&pio 4 8 1>; /* PE8 GPIO_ACTIVE_LOW */
+                               };
+                       };
+               };
+       };
+};