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55 lines
1.9 KiB
55 lines
1.9 KiB
* Samsung S3C2443 Clock Controller |
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The S3C2443 clock controller generates and supplies clock to various controllers |
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within the SoC. The clock binding described here is applicable to all SoCs in |
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the s3c24x family starting with the s3c2443. |
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Required Properties: |
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- compatible: should be one of the following. |
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- "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC. |
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- "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC. |
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- "samsung,s3c2450-clock" - controller compatible with S3C2450 SoC. |
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- reg: physical base address of the controller and length of memory mapped |
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region. |
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- #clock-cells: should be 1. |
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Each clock is assigned an identifier and client nodes can use this identifier |
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to specify the clock which they consume. Some of the clocks are available only |
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on a particular SoC. |
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All available clocks are defined as preprocessor macros in |
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dt-bindings/clock/s3c2443.h header and can be used in device |
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tree sources. |
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External clocks: |
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There are several clocks that are generated outside the SoC. It is expected |
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that they are defined using standard clock bindings with following |
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clock-output-names: |
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- "xti" - crystal input - required, |
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- "ext" - external clock source - optional, |
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- "ext_i2s" - external I2S clock - optional, |
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- "ext_uart" - external uart clock - optional, |
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Example: Clock controller node: |
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clocks: clock-controller@4c000000 { |
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compatible = "samsung,s3c2416-clock"; |
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reg = <0x4c000000 0x40>; |
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#clock-cells = <1>; |
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}; |
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Example: UART controller node that consumes the clock generated by the clock |
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controller (refer to the standard clock bindings for information about |
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"clocks" and "clock-names" properties): |
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serial@50004000 { |
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compatible = "samsung,s3c2440-uart"; |
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reg = <0x50004000 0x4000>; |
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interrupts = <1 23 3 4>, <1 23 4 4>; |
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clock-names = "uart", "clk_uart_baud2", |
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"clk_uart_baud3"; |
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clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>, |
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<&clocks SCLK_UART>; |
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};
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