Add device tree overlay used for Enviro Board
Change-Id: I02c01d1b675657c8b27f39f4cf1d0e173cce396c
diff --git a/coral-enviro-devicetree/README b/coral-enviro-devicetree/README
new file mode 100644
index 0000000..fc73f44
--- /dev/null
+++ b/coral-enviro-devicetree/README
@@ -0,0 +1,11 @@
+This device tree overlay is provided to enable the functionality of the Coral
+Environmental Sensor Board. It is already included on the HAT EEPROM included
+with the board.
+
+If customization of the blob is desired, dtc is used to compile the overlay:
+dtc -@ -I dts -O dtb -o coral-enviro-board-overlay.dtbo coral-enviro-board-overlay.dts
+
+It is also possible to overwrite the EEPROM. In order to do this:
+1) Short JP1 (a solder bridge) to unlock the EEPROM.
+2) Enable I2C0 access (add dtparam=i2c0=on to config.txt in the boot partiton).
+3) Rebuild and flash following instructions at https://github.com/raspberrypi/hats/tree/master/eepromutils
diff --git a/coral-enviro-devicetree/coral-enviro-board-overlay.dts b/coral-enviro-devicetree/coral-enviro-board-overlay.dts
new file mode 100644
index 0000000..4d8d91d
--- /dev/null
+++ b/coral-enviro-devicetree/coral-enviro-board-overlay.dts
@@ -0,0 +1,53 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&i2c_arm>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ opt3002@44 {
+ compatible = "ti,opt3001";
+ reg = <0x45>; /* address */
+ interrupt-parent = <&gpio>;
+ interrupts = <27 2>; /* IRQ_TYPE_EDGE_FALLING */
+ #gpio-cells = <2>;
+ };
+
+ hdc2010@40 {
+ compatible = "hdc20x0";
+ reg = <0x40>; /* address */
+ };
+
+ bmp280@76 {
+ compatible = "bmp280";
+ reg = <0x76>; /* address */
+ };
+
+ tla2021@49 {
+ compatible = "tla202x";
+ reg = <0x49>; /* address */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ ti,gain = <0>; /* +/- 6.144 V range */
+ };
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&spi0>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+};
+
