From 78435c812afa70b8ddee789c7f37fc88738079a0 Mon Sep 17 00:00:00 2001 From: Heiko Stuebner Date: Wed, 19 Feb 2014 09:25:45 +0900 Subject: [PATCH] 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 Acked-by: Tomasz Figa Signed-off-by: Kukjin Kim --- .../bindings/clock/samsung,s3c2443-clock.txt | 56 +++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt diff --git a/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt new file mode 100644 index 000000000000..e67bb05478af --- /dev/null +++ b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt @@ -0,0 +1,56 @@ +* 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"; + }; -- 2.34.1