* Samsung Exynos4 Clock Controller The Exynos4 clock controller generates and supplies clock to various controllers within the Exynos4 SoC. The clock binding described here is applicable to all SoC's in the Exynos4 family. Required Properties: - compatible: should be one of the following. - "samsung,exynos4210-clock" - controller compatible with Exynos4210 SoC. - "samsung,exynos4412-clock" - controller compatible with Exynos4412 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. All available clocks are defined as preprocessor macros in dt-bindings/clock/exynos4.h header and can be used in device tree sources. Example 1: An example of a clock controller node is listed below. clock: clock-controller@10030000 { compatible = "samsung,exynos4210-clock"; reg = <0x10030000 0x20000>; #clock-cells = <1>; }; Example 2: 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' property. serial@13820000 { compatible = "samsung,exynos4210-uart"; reg = <0x13820000 0x100>; interrupts = <0 54 0>; clocks = <&clock CLK_UART2>, <&clock CLK_SCLK_UART2>; clock-names = "uart", "clk_uart_baud0"; }; Exynos4412 SoC contains some additional clocks for FIMC-ISP (Camera ISP) subsystem. Registers for those clocks are located in the ISP power domain. Because those registers are also located in a different memory region than the main clock controller, a separate clock controller has to be defined for handling them. Required Properties: - compatible: should be "samsung,exynos4412-isp-clock". - reg: physical base address of the ISP clock controller and length of memory mapped region. - #clock-cells: should be 1. - clocks: list of the clock controller input clock identifiers, from common clock bindings, should point to CLK_ACLK200 and CLK_ACLK400_MCUISP clocks from the main clock controller. - clock-names: list of the clock controller input clock names, as described in clock-bindings.txt, should be "aclk200" and "aclk400_mcuisp". - power-domains: a phandle to ISP power domain node as described by generic PM domain bindings. Example 3: The clock controllers bindings for Exynos4412 SoCs. clock: clock-controller@10030000 { compatible = "samsung,exynos4412-clock"; reg = <0x10030000 0x18000>; #clock-cells = <1>; }; isp_clock: clock-controller@10048000 { compatible = "samsung,exynos4412-isp-clock"; reg = <0x10048000 0x1000>; #clock-cells = <1>; power-domains = <&pd_isp>; clocks = <&clock CLK_ACLK200>, <&clock CLK_ACLK400_MCUISP>; clock-names = "aclk200", "aclk400_mcuisp"; }; |