[PATCH v3 2/5] iio: sensorhub: Add sensorhub bindings

[Karol Wrona <k.wrona@samsung.com>]

Add sensorhub bindings for sensorhub on Galaxy Gear 2.

Change-Id: I4ee25aef33c21a4662de230841de9a8684f2c26b
Signed-off-by: Karol Wrona <k.wrona@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 .../devicetree/bindings/iio/sensorhub.txt          |   46 ++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/sensorhub.txt

diff --git a/Documentation/devicetree/bindings/iio/sensorhub.txt b/Documentation/devicetree/bindings/iio/sensorhub.txt
new file mode 100644
index 0000000..2aca0c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/sensorhub.txt
@@ -0,0 +1,46 @@
+Samsung Sensorhub driver
+
+Sensorhub is a MCU which manages several sensors and also plays the role
+of a virtual sensor device.
+
+Required properties:
+- compatible: "samsung,sensorhub-rinato" or "samsung,sensorhub-thermostat"
+- spi-max-frequency: max SPI clock frequency
+- interrupt-parent: interrupt parent
+- interrupts: communication interrupt
+- ap-mcu-gpio: [out] ap to sensorhub line - used during communication
+- mcu-ap-gpio: [in] sensorhub to ap - used during communication
+- mcu-reset: [out] sensorhub reset
+
+Optional properties:
+- sensor's nodes:
+  compatible = "samsung,mpu6500-accel"
+  compatible = "samsung,mpu6500-gyro"
+  compatible = "samsung,adpd142"
+
+Sensor compatibles are used to match proper sensor driver to real sensor on
+the board. The firmware does not give such information, so it helps to specify
+some sensors properties. Sensors have "samsung" prefixes because frequently
+they will not have much in common with sensors used without sensorhub because
+it can do some data processing.
+
+Example:
+
+	shub_spi: shub {
+		compatible = "samsung,sensorhub-rinato";
+		spi-max-frequency = <5000000>;
+		interrupt-parent = <&gpx0>;
+		interrupts = <2 0>;
+		ap-mcu-gpio = <&gpx0 0 0>;
+		mcu-ap-gpio = <&gpx0 4 0>;
+		mcu-reset = <&gpx0 5 0>;
+		sensor@0 {
+			compatible = "samsung,mpu6500-accel";
+		};
+		sensor@1 {
+			compatible = "samsung,mpu6500-gyro";
+		};
+		sensor@2 {
+			compatible = "samsung,adpd142";
+		};
+	};
-- 
1.7.9.5