openwrt/target/linux/brcm2708/patches-4.4/0558-BCM270X_DT-Add-i2c-sensor-overlay.patch

From ec94d922b57bb7d6586eaf1e1af02e9383680d15 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 5 Dec 2016 17:10:44 +0000
Subject: [PATCH] BCM270X_DT: Add i2c-sensor overlay

The i2c-sensor overlay is a container for various pressure and
temperature sensors, currently bmp085 and bmp280. The standalone
bmp085_i2c-sensor overlay is now deprecated.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile               |  1 +
 arch/arm/boot/dts/overlays/README                 | 12 ++++++--
 arch/arm/boot/dts/overlays/i2c-sensor-overlay.dts | 34 +++++++++++++++++++++++
 3 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm/boot/dts/overlays/i2c-sensor-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -42,6 +42,7 @@ dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-mux.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-pwm-pca9685a.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += i2c-sensor.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c1-bcm2708.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2s-gpio28-31.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -283,8 +283,7 @@ Params: swap_lr                 Reverse
 
 
 Name:   bmp085_i2c-sensor
-Info:   Configures the BMP085/BMP180 digital barometric pressure and temperature
-        sensors from Bosch Sensortec
+Info:   This overlay is now deprecated - see i2c-sensor
 Load:   dtoverlay=bmp085_i2c-sensor
 Params: <None>
 
@@ -536,6 +535,15 @@ Params: abx80x                  Select o
                                 source
 
 
+Name:   i2c-sensor
+Info:   Adds support for a number of I2C barometric pressure and temperature
+        sensors on i2c_arm
+Load:   dtoverlay=i2c-sensor,<param>=<val>
+Params: bmp085                  Select the Bosch sensortronic BMP085
+
+        bmp280                  Select the Bosch sensortronic BMP280
+
+
 Name:   i2c0-bcm2708
 Info:   Enable the i2c_bcm2708 driver for the i2c0 bus. Not all pin combinations
         are usable on all platforms.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/i2c-sensor-overlay.dts
@@ -0,0 +1,34 @@
+// Definitions for a few digital barometric pressure and temperature sensors
+/dts-v1/;
+/plugin/;
+
+/ {
+        compatible = "brcm,bcm2708";
+
+        fragment@0 {
+                target = <&i2c_arm>;
+                __overlay__ {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        status = "okay";
+
+                        bmp085: bmp085@77 {
+                                compatible = "bosch,bmp085";
+                                reg = <0x77>;
+                                default-oversampling = <3>;
+                                status = "disable";
+                        };
+
+                        bmp280: bmp280@76 {
+                                compatible = "bosch,bmp280";
+                                reg = <0x76>;
+                                status = "disable";
+                        };
+                };
+        };
+
+	__overrides__ {
+		bmp085 = <&bmp085>,"status";
+		bmp280 = <&bmp280>,"status";
+	};
+};