dt-bindings: add documentation for s3c2410 clock controller
From: Heiko Stuebner <heiko@...> Date: Thu, 12 Dec 2013 15:23:18 +0100
Commit-Message
Describe the clock controller of s3c2410, s3c2440 and s3c2442. Signed-off-by: Heiko Stuebner <heiko@...> Acked-by: Tomasz Figa <t.figa@...>
Patch-Comment
.../bindings/clock/samsung,s3c2410-clock.txt | 50 ++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/samsung,s3c2410-clock.txt
Statistics
- 50 lines added
- 0 lines removed
Changes
------ Documentation/devicetree/bindings/clock/samsung,s3c2410-clock.txt -------
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+* Samsung S3C2410 Clock Controller
+
+The S3C2410 clock controller generates and supplies clock to various controllers
+within the SoC. The clock binding described here is applicable to the s3c2410,
+s3c2440 and s3c2442 SoCs in the s3c24x family.
+
+Required Properties:
+
+- compatible: should be one of the following.
+ - "samsung,s3c2410-clock" - controller compatible with S3C2410 SoC.
+ - "samsung,s3c2440-clock" - controller compatible with S3C2440 SoC.
+ - "samsung,s3c2442-clock" - controller compatible with S3C2442 SoC.
+- 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. Some of the clocks are available only
+on a particular SoC.
+
+All available clocks are defined as preprocessor macros in
+dt-bindings/clock/samsung,s3c2410-clock.h header and can be used in device
+tree sources.
+
+External clocks:
+
+The xti clock used as input for the plls is generated outside the SoC. It is
+expected that is are defined using standard clock bindings with a
+clock-output-names value of "xti".
+
+Example: Clock controller node:
+
+ clocks: clock-controller@4c000000 {
+ compatible = "samsung,s3c2410-clock";
+ reg = <0x4c000000 0x20>;
+ #clock-cells = <1>;
+ };
+
+Example: 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" properties):
+
+ serial@50004000 {
+ compatible = "samsung,s3c2440-uart";
+ reg = <0x50004000 0x4000>;
+ interrupts = <1 23 3 4>, <1 23 4 4>;
+ clock-names = "uart", "clk_uart_baud2";
+ clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>;
+ status = "disabled";
+ };