DT: i2c: Add binding document for IMG I2C SCB

Introduce a devicetree binding for Imagination Technologies
I2C SCB controller.

Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/Documentation/devicetree/bindings/i2c/i2c-img-scb.txt b/Documentation/devicetree/bindings/i2c/i2c-img-scb.txt
new file mode 100644 (file)
index 0000000..b646160
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-img-scb.txt
@@ -0,0 +1,26 @@
+IMG Serial Control Bus (SCB) I2C Controller
+
+Required Properties:
+- compatible: "img,scb-i2c"
+- reg: Physical base address and length of controller registers
+- interrupts: Interrupt number used by the controller
+- clocks : Should contain a clock specifier for each entry in clock-names
+- clock-names : Should contain the following entries:
+                "scb", for the SCB core clock.
+                "sys", for the system clock.
+- clock-frequency: The I2C bus frequency in Hz
+- #address-cells: Should be <1>
+- #size-cells: Should be <0>
+
+Example:
+
+i2c@18100000 {
+       compatible = "img,scb-i2c";
+       reg = <0x18100000 0x200>;
+       interrupts = <GIC_SHARED 2 IRQ_TYPE_LEVEL_HIGH>;
+       clocks = <&i2c0_clk>, <&system_clk>;
+       clock-names = "scb", "sys";
+       clock-frequency = <400000>;
+       #address-cells = <1>;
+       #size-cells = <0>;
+};