[PATCH 1/2 v2] iio: gyro: Add MPU-3050 device tree bindings

[Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

This adds device tree bindings for the MPU-3050 gyroscope. Since it
is the first set of bindings for a gyroscope, the folder for it
is also created.

Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Peter Rosin <peda-koto5C5qi+TLoDKTGw+V6w@public.gmane.org>
Signed-off-by: Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
ChangeLog v1->v2:
- Not yet convered to use i2c-gate as I'm waiting for that
  patch set to stabilize.
- No changes, just reposting to keep the series together.
---
 .../bindings/iio/gyroscope/invensense,mpu3050.txt  | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.txt

diff --git a/Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.txt b/Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.txt
new file mode 100644
index 000000000000..e17231a5f4b5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.txt
@@ -0,0 +1,54 @@
+Invensense MPU-3050 Gyroscope device tree bindings
+
+Required properties:
+  - compatible : should be "invensense,mpu3050"
+  - reg : the I2C address of the sensor
+  - #address-cells : should be <1>, used to indicate the optional
+    I2C mux node
+  - #size-cells : should be <0>
+
+Optional properties:
+  - interrupt-parent : should be the phandle for the interrupt controller
+  - interrupts : interrupt mapping for the trigger interrupt from the
+    internal oscillator. The following IRQ modes are supported:
+    IRQ_TYPE_EDGE_RISING, IRQ_TYPE_EDGE_FALLING, IRQ_TYPE_LEVEL_HIGH and
+    IRQ_TYPE_LEVEL_LOW. The driver should detect and configure the hardware
+    for the desired interrupt type.
+  - vdd-supply : supply regulator for the main power voltage.
+  - vlogic-supply : supply regulator for the signal voltage.
+  - mount-matrix : see iio/mount-matrix.txt
+
+Optional subnodes:
+  - The MPU-3050 will pass through and forward the I2C signals from the
+    incoming I2C bus, alternatively drive traffic to a slave device (usually
+    an accelerometer) on its own initiative. Therefore is supports a subnode
+    i2c master node. This node is like any I2C master and should contain:
+    #address-cells = <1>;
+    #size-cells = <0>;
+    reg = <0>;
+
+Example:
+
+mpu3050@68 {
+	compatible = "invensense,mpu3050";
+	reg = <0x68>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	interrupt-parent = <&foo>;
+	interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
+	vdd-supply = <&bar>;
+	vlogic-supply = <&baz>;
+
+	/* External I2C interface */
+	i2c@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+		fnord@18 {
+			compatible = "fnord";
+			reg = <0x18>;
+			interrupt-parent = <&foo>;
+			interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+		};
+	};
+};
-- 
2.7.4