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authorHeiko Stuebner <heiko@sntech.de>2014-02-19 09:25:45 +0900
committerKukjin Kim <kgene.kim@samsung.com>2014-04-15 02:11:07 +0900
commit78435c812afa70b8ddee789c7f37fc88738079a0 (patch)
tree1decc591990666d2bb8017a6efee47f152d50415 /Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
parenta951b1d91dcca8d373c92666c5e006de8234d34b (diff)
dt-bindings: add binding for clock-controller of s3c2443 and following
Starting with the s3c2443 the s3c24xx series got a new clock tree compared to the previous s3c24xx socs. This binding describes the clock controller found in the s3c2443, s3c2416 and s3c2450 socs. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
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+* Samsung S3C2443 Clock Controller
+
+The S3C2443 clock controller generates and supplies clock to various controllers
+within the SoC. The clock binding described here is applicable to all SoCs in
+the s3c24x family starting with the s3c2443.
+
+Required Properties:
+
+- compatible: should be one of the following.
+ - "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC.
+ - "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC.
+ - "samsung,s3c2450-clock" - controller compatible with S3C2450 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/s3c2443.h header and can be used in device
+tree sources.
+
+External clocks:
+
+There are several clocks that are generated outside the SoC. It is expected
+that they are defined using standard clock bindings with following
+clock-output-names:
+ - "xti" - crystal input - required,
+ - "ext" - external clock source - optional,
+ - "ext_i2s" - external I2S clock - optional,
+ - "ext_uart" - external uart clock - optional,
+
+Example: Clock controller node:
+
+ clocks: clock-controller@4c000000 {
+ compatible = "samsung,s3c2416-clock";
+ reg = <0x4c000000 0x40>;
+ #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",
+ "clk_uart_baud3";
+ clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
+ <&clocks SCLK_UART>;
+ status = "disabled";
+ };