i2c: pca954x: Add device tree bindings documentation

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
new file mode 100644 (file)
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+* NXP PCA954x I2C bus switch
+
+Required Properties:
+
+  - compatible: Must contain one of the following.
+    "nxp,pca9540", "nxp,pca9542", "nxp,pca9543", "nxp,pca9544",
+    "nxp,pca9545", "nxp,pca9546", "nxp,pca9547", "nxp,pca9548"
+
+  - reg: The I2C address of the device.
+
+  The following required properties are defined externally:
+
+  - Standard I2C mux properties. See i2c-mux.txt in this directory.
+  - I2C child bus nodes. See i2c-mux.txt in this directory.
+
+
+Example:
+
+       i2c-switch@74 {
+               compatible = "nxp,pca9548";
+               #address-cells = <1>;
+               #size-cells = <0>;
+               reg = <0x74>;
+
+               i2c@2 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <2>;
+
+                       eeprom@54 {
+                               compatible = "at,24c08";
+                               reg = <0x54>;
+                       };
+               };
+
+               i2c@4 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <4>;
+
+                       rtc@51 {
+                               compatible = "nxp,pcf8563";
+                               reg = <0x51>;
+                       };
+               };
+       };