[PATCH 3/5] clk: samsung: Document binding for Exynos4415 clock controller

[Chanwoo Choi <cw00.choi@samsung.com>]

The Exynos4415 clocks are statically listed and registered using the
Samsung specific common clock helper functions. Both device tree based
clock lookup and clkdev based clock lookups are supported.

Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 .../devicetree/bindings/clock/exynos4415-clock.txt | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/exynos4415-clock.txt

diff --git a/Documentation/devicetree/bindings/clock/exynos4415-clock.txt b/Documentation/devicetree/bindings/clock/exynos4415-clock.txt
new file mode 100644
index 0000000..8aa4f4f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/exynos4415-clock.txt
@@ -0,0 +1,49 @@
+* Samsung Exynos4415 Clock Controller
+
+The Exynos4415 clock controller generates and supplies clock to various
+controllers within the Exynos4415 SoC.
+
+Required Properties:
+
+- compatible: should be one of the following.
+  - "samsung,exynos4415-cmu" - controller compatible with Exynos4415 SoC.
+  - "samsung,exynos4415-cmu-dmc" - controller compatible with
+    Exynos4415 SoC for Dynamic Memory Controller domain.
+
+- reg: physical base address of the controller and length of memory mapped
+  region.
+
+- #clock-cells: should be 1.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume.
+
+All available clocks are defined as preprocessor macros in
+dt-bindings/clock/exynos4415.h header and can be used in device
+tree sources.
+
+Example 1: An example of a clock controller node is listed below.
+
+	cmu: clock-controller@10030000 {
+		compatible = "samsung,exynos4415-cmu";
+		reg = <0x10030000 0x18000>;
+		#clock-cells = <1>;
+	};
+
+	cmu-dmc: clock-controller@105C0000 {
+		compatible = "samsung,exynos4415-cmu-dmc";
+		reg = <0x105C0000 0x3000>;
+		#clock-cells = <1>;
+	};
+
+Example 2: UART controller node that consumes the clock generated by the clock
+	   controller. Refer to the standard clock bindings for information
+	   about 'clocks' and 'clock-names' property.
+
+	serial_0: serial@13800000 {
+		compatible = "samsung,exynos4210-uart";
+		reg = <0x13800000 0x100>;
+		interrupts = <0 109 0>;
+		clocks = <&cmu CLK_UART0>, <&cmu CLK_SCLK_UART0>;
+		clock-names = "uart", "clk_uart_baud0";
+	};
-- 
1.8.0