Heiko Stuebner | 78435c8 | 2014-02-19 09:25:45 +0900 | [diff] [blame] | 1 | * Samsung S3C2443 Clock Controller |
| 2 | |
| 3 | The S3C2443 clock controller generates and supplies clock to various controllers |
| 4 | within the SoC. The clock binding described here is applicable to all SoCs in |
| 5 | the s3c24x family starting with the s3c2443. |
| 6 | |
| 7 | Required Properties: |
| 8 | |
| 9 | - compatible: should be one of the following. |
| 10 | - "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC. |
| 11 | - "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC. |
| 12 | - "samsung,s3c2450-clock" - controller compatible with S3C2450 SoC. |
| 13 | - reg: physical base address of the controller and length of memory mapped |
| 14 | region. |
| 15 | - #clock-cells: should be 1. |
| 16 | |
| 17 | Each clock is assigned an identifier and client nodes can use this identifier |
| 18 | to specify the clock which they consume. Some of the clocks are available only |
| 19 | on a particular SoC. |
| 20 | |
| 21 | All available clocks are defined as preprocessor macros in |
| 22 | dt-bindings/clock/s3c2443.h header and can be used in device |
| 23 | tree sources. |
| 24 | |
| 25 | External clocks: |
| 26 | |
| 27 | There are several clocks that are generated outside the SoC. It is expected |
| 28 | that they are defined using standard clock bindings with following |
| 29 | clock-output-names: |
| 30 | - "xti" - crystal input - required, |
| 31 | - "ext" - external clock source - optional, |
| 32 | - "ext_i2s" - external I2S clock - optional, |
| 33 | - "ext_uart" - external uart clock - optional, |
| 34 | |
| 35 | Example: Clock controller node: |
| 36 | |
| 37 | clocks: clock-controller@4c000000 { |
| 38 | compatible = "samsung,s3c2416-clock"; |
| 39 | reg = <0x4c000000 0x40>; |
| 40 | #clock-cells = <1>; |
| 41 | }; |
| 42 | |
| 43 | Example: UART controller node that consumes the clock generated by the clock |
| 44 | controller (refer to the standard clock bindings for information about |
| 45 | "clocks" and "clock-names" properties): |
| 46 | |
| 47 | serial@50004000 { |
| 48 | compatible = "samsung,s3c2440-uart"; |
| 49 | reg = <0x50004000 0x4000>; |
| 50 | interrupts = <1 23 3 4>, <1 23 4 4>; |
| 51 | clock-names = "uart", "clk_uart_baud2", |
| 52 | "clk_uart_baud3"; |
| 53 | clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>, |
| 54 | <&clocks SCLK_UART>; |
| 55 | status = "disabled"; |
| 56 | }; |