mpu6050 device tree overlay (#2031)

Add overlay and config options for InvenSense MPU6050 6-axis motion
detector.

Author: T0ny0

arch/arm/boot/dts/overlays/Makefile

@@ -58,6 +58,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	mcp3008.dtbo \
 	midi-uart0.dtbo \
 	mmc.dtbo \
+	mpu6050.dtbo \
 	mz61581.dtbo \
 	pi3-act-led.dtbo \
 	pi3-disable-bt.dtbo \

arch/arm/boot/dts/overlays/README

@@ -891,6 +891,12 @@ Params: overclock_50            Clock (in MHz) to use when the MMC framework
                                 requests 50MHz
 
 
+Name:   mpu6050
+Info:   Overlay for i2c connected mpu6050 imu
+Load:   dtoverlay=mpu6050,<param>=<val>
+Params: interrupt               GPIO pin for interrupt (default 4)
+
+
 Name:   mz61581
 Info:   MZ61581 display by Tontec
 Load:   dtoverlay=mz61581,<param>=<val>

arch/arm/boot/dts/overlays/mpu6050-overlay.dts

@@ -0,0 +1,28 @@
+// Definitions for MPU6050
+/dts-v1/;
+/plugin/;
+
+/ {
+        compatible = "brcm,bcm2708";
+
+        fragment@0 {
+                target = <&i2c1>;
+                __overlay__ {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        status = "okay";
+                        clock-frequency = <400000>;
+
+                        mpu6050: mpu6050@68 {
+                                compatible = "invensense,mpu6050";
+                                reg = <0x68>;
+                                interrupt-parent = <&gpio>;
+                                interrupts = <4 1>;
+                        };
+                };
+        };
+
+        __overrides__ {
+                interrupt = <&mpu6050>,"interrupts:0";
+        };
+};

arch/arm/configs/bcm2709_defconfig

@@ -1173,13 +1173,12 @@ CONFIG_RASPBERRYPI_POWER=y
 CONFIG_EXTCON=m
 CONFIG_EXTCON_ARIZONA=m
 CONFIG_IIO=m
-CONFIG_IIO_BUFFER=y
 CONFIG_IIO_BUFFER_CB=m
-CONFIG_IIO_KFIFO_BUF=m
 CONFIG_MCP320X=m
 CONFIG_MCP3422=m
 CONFIG_DHT11=m
 CONFIG_HTU21=m
+CONFIG_INV_MPU6050_I2C=m
 CONFIG_BMP280=m
 CONFIG_PWM_BCM2835=m
 CONFIG_PWM_PCA9685=m

arch/arm/configs/bcmrpi_defconfig

@@ -1182,13 +1182,12 @@ CONFIG_RASPBERRYPI_POWER=y
 CONFIG_EXTCON=m
 CONFIG_EXTCON_ARIZONA=m
 CONFIG_IIO=m
-CONFIG_IIO_BUFFER=y
 CONFIG_IIO_BUFFER_CB=m
-CONFIG_IIO_KFIFO_BUF=m
 CONFIG_MCP320X=m
 CONFIG_MCP3422=m
 CONFIG_DHT11=m
 CONFIG_HTU21=m
+CONFIG_INV_MPU6050_I2C=m
 CONFIG_BMP280=m
 CONFIG_PWM_BCM2835=m
 CONFIG_PWM_PCA9685=m