i2c-s3c2410: Add device tree support

[pandora-kernel.git] / Documentation / devicetree / bindings / i2c / samsung-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
new file mode 100644 (file)
index 0000000..38832c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
@@ -0,0 +1,39 @@
+* Samsung's I2C controller
+
+The Samsung's I2C controller is used to interface with I2C devices.
+
+Required properties:
+  - compatible: value should be either of the following.
+      (a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
+      (b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
+  - reg: physical base address of the controller and length of memory mapped
+    region.
+  - interrupts: interrupt number to the cpu.
+  - samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
+  - gpios: The order of the gpios should be the following: <SDA, SCL>.
+    The gpio specifier depends on the gpio controller.
+
+Optional properties:
+  - samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
+    specified, default value is 0.
+  - samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
+    specified, the default value in Hz is 100000.
+
+Example:
+
+       i2c@13870000 {
+               compatible = "samsung,s3c2440-i2c";
+               reg = <0x13870000 0x100>;
+               interrupts = <345>;
+               samsung,i2c-sda-delay = <100>;
+               samsung,i2c-max-bus-freq = <100000>;
+               gpios = <&gpd1 2 0 /* SDA */
+                        &gpd1 3 0 /* SCL */>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               wm8994@1a {
+                       compatible = "wlf,wm8994";
+                       reg = <0x1a>;
+               };
+       };