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>

1 files changed, 46 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
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index 000000000000..cc7e7fd92e31
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+++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
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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>;
+                        };
+                };
+        };