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1* Hisilicon Hi6220 Clock Controller2 3Clock control registers reside in different Hi6220 system controllers,4please refer the following document to know more about the binding rules5for these system controllers:6 7Documentation/devicetree/bindings/arm/hisilicon/hisilicon.yaml8 9Required Properties:10 11- compatible: the compatible should be one of the following strings to12 indicate the clock controller functionality.13 14 - "hisilicon,hi6220-acpu-sctrl"15 - "hisilicon,hi6220-aoctrl"16 - "hisilicon,hi6220-sysctrl"17 - "hisilicon,hi6220-mediactrl"18 - "hisilicon,hi6220-pmctrl"19 - "hisilicon,hi6220-stub-clk"20 21- reg: physical base address of the controller and length of memory mapped22 region.23 24- #clock-cells: should be 1.25 26Optional Properties:27 28- hisilicon,hi6220-clk-sram: phandle to the syscon managing the SoC internal sram;29 the driver need use the sram to pass parameters for frequency change.30 31- mboxes: use the label reference for the mailbox as the first parameter, the32 second parameter is the channel number.33 34Example 1:35 sys_ctrl: sys_ctrl@f7030000 {36 compatible = "hisilicon,hi6220-sysctrl", "syscon";37 reg = <0x0 0xf7030000 0x0 0x2000>;38 #clock-cells = <1>;39 };40 41Example 2:42 stub_clock: stub_clock {43 compatible = "hisilicon,hi6220-stub-clk";44 hisilicon,hi6220-clk-sram = <&sram>;45 #clock-cells = <1>;46 mboxes = <&mailbox 1>;47 };48 49Each clock is assigned an identifier and client nodes use this identifier50to specify the clock which they consume.51 52All these identifier could be found in <dt-bindings/clock/hi6220-clock.h>.53