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77 lines
2.3 KiB
77 lines
2.3 KiB
* Samsung S5P6442/S5PC110/S5PV210 Clock Controller |
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Samsung S5P6442, S5PC110 and S5PV210 SoCs contain integrated clock |
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controller, which generates and supplies clock to various controllers |
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within the SoC. |
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Required Properties: |
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- compatible: should be one of following: |
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- "samsung,s5pv210-clock" : for clock controller of Samsung |
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S5PC110/S5PV210 SoCs, |
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- "samsung,s5p6442-clock" : for clock controller of Samsung |
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S5P6442 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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All available clocks are defined as preprocessor macros in |
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dt-bindings/clock/s5pv210.h header and can be used in device 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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- "xxti": external crystal oscillator connected to XXTI and XXTO pins of |
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the SoC, |
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- "xusbxti": external crystal oscillator connected to XUSBXTI and XUSBXTO |
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pins of the SoC, |
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A subset of above clocks available on given board shall be specified in |
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board device tree, including the system base clock, as selected by XOM[0] |
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pin of the SoC. Refer to generic fixed rate clock bindings |
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documentation[1] for more information how to specify these clocks. |
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[1] Documentation/devicetree/bindings/clock/fixed-clock.yaml |
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Example: Clock controller node: |
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clock: clock-controller@7e00f000 { |
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compatible = "samsung,s5pv210-clock"; |
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reg = <0x7e00f000 0x1000>; |
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#clock-cells = <1>; |
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}; |
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Example: Required external clocks: |
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xxti: clock-xxti { |
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compatible = "fixed-clock"; |
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clock-output-names = "xxti"; |
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clock-frequency = <24000000>; |
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#clock-cells = <0>; |
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}; |
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xusbxti: clock-xusbxti { |
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compatible = "fixed-clock"; |
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clock-output-names = "xusbxti"; |
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clock-frequency = <24000000>; |
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#clock-cells = <0>; |
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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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uart0: serial@e2900000 { |
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compatible = "samsung,s5pv210-uart"; |
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reg = <0xe2900000 0x400>; |
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interrupt-parent = <&vic1>; |
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interrupts = <10>; |
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clock-names = "uart", "clk_uart_baud0", |
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"clk_uart_baud1"; |
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clocks = <&clocks UART0>, <&clocks UART0>, |
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<&clocks SCLK_UART0>; |
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};
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