From: Antonio Ospite <ao2@ao2.it>
Date: Sat, 9 Jun 2018 17:48:59 +0000 (+0000)
Subject: Initial import
X-Git-Url: https://git.ao2.it/experiments/bbb-gpio-keypad.git/commitdiff_plain/cb13f20965339570792a0c2446159ba30c7f5bdb

Initial import
---

cb13f20965339570792a0c2446159ba30c7f5bdb
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0361461
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.dtbo
+*.dts.tmp
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..fa051fa
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,16 @@
+PART_NUMBER = bbb-gpio-keypad
+VERSION = 00A0
+
+INCLUDE_PATH = /home/debian/bb.org-overlays/include
+
+compile: $(PART_NUMBER)-$(VERSION).dtbo
+
+install: compile
+	cp $(PART_NUMBER)-$(VERSION).dtbo /lib/firmware
+
+clean:
+	rm -f *.dtbo *.dts.tmp *~
+
+%.dtbo: %.dts
+	cpp -nostdinc -undef -D__DTS__ -I$(INCLUDE_PATH) -x assembler-with-cpp -o $<.tmp $<
+	dtc -Wno-unit_address_vs_reg -O dtb -o $@ -b 0 -@ $<.tmp
diff --git a/README b/README
new file mode 100644
index 0000000..ea42e59
--- /dev/null
+++ b/README
@@ -0,0 +1,26 @@
+Simple devicetree definition for a gpio keypad for connected to a BeagleBone
+Black and using the gpio-keys driver.
+
+The keypad is connected this way:
+
+  P8_07 -> KEY_TOP
+  P8_08 -> KEY_LEFT
+  P8_09 -> KEY_RIGHT
+  P8_10 -> KEY_BOTTOM
+
+The .dts file depends on definitions from bb.org-overlays, to download it
+execute the following commands:
+
+  $ cd ~
+  $ git clone https://github.com/beagleboard/bb.org-overlays.git
+
+To compile and install the devicetree overlay execute the following commands:
+
+  $ make && sudo make install
+
+And add an entry with the DT overlay to /boot/uEnv.txt, for example:
+
+  uboot_overlay_addr1=/lib/firmware/bbb-gpio-keypad-00A0.dtbo
+
+
+Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
diff --git a/bbb-gpio-keypad-00A0.dts b/bbb-gpio-keypad-00A0.dts
new file mode 100644
index 0000000..d290093
--- /dev/null
+++ b/bbb-gpio-keypad-00A0.dts
@@ -0,0 +1,72 @@
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/board/am335x-bbw-bbb-base.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/am33xx.h>
+
+/ {
+    compatible = "ti,beaglebone", "ti,beaglebone-black";
+
+    /* identification */
+    part-number = "gpio-keypad-ao2";
+    version = "00A0";
+
+    // resources this cape uses
+    exclusive-use =
+      "P8.07",
+      "P8.08",
+      "P8.09",
+      "P8.10";
+
+    fragment@0 {
+        target = <&am33xx_pinmux>;
+        __overlay__ {
+            keypad_pins: pinmux_gpio_pins{
+                pinctrl-single,pins = <
+		    BONE_P8_07 (PIN_INPUT_PULLUP | MUX_MODE7)
+		    BONE_P8_08 (PIN_INPUT_PULLUP | MUX_MODE7)
+		    BONE_P8_09 (PIN_INPUT_PULLUP | MUX_MODE7)
+		    BONE_P8_10 (PIN_INPUT_PULLUP | MUX_MODE7)
+                >;
+            };
+        };
+    };
+
+    fragment@1 {
+        target-path = "/";
+        __overlay__ {
+            gpio_keys {
+                compatible = "gpio-keys";
+                pinctrl-names = "default";
+                pinctrl-0 = <&keypad_pins>;
+
+                up {
+                    label = "GPIO Key UP";
+                    linux,code = <103>;
+                    gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
+                    debounce_interval = <50>;
+                };
+                left {
+                    label = "GPIO Key LEFT";
+                    linux,code = <105>;
+                    gpios = <&gpio2 3 GPIO_ACTIVE_LOW>;
+                    debounce_interval = <50>;
+                };
+                right {
+                    label = "GPIO Key RIGHT";
+                    linux,code = <106>;
+                    gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+                    debounce_interval = <50>;
+                };
+                down {
+                    label = "GPIO Key DOWN";
+                    linux,code = <108>;
+                    gpios = <&gpio2 4 GPIO_ACTIVE_LOW>;
+                    debounce_interval = <50>;
+                };
+            };
+        };
+    };
+};
+