i2c-s3c2410: Add device tree support

Add device tree probe support for Samsung's s3c2410 i2c driver.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
new file mode 100644
index 00000000000..38832c71291
--- /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>;
+                };
+        };