1* Hisilicon Hi6220 Clock Controller 2 3Clock control registers reside in different Hi6220 system controllers, 4please refer the following document to know more about the binding rules 5for these system controllers: 6 7Documentation/devicetree/bindings/arm/hisilicon/hisilicon.yaml 8 9Required Properties: 10 11- compatible: the compatible should be one of the following strings to 12 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 mapped 22 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, the 32 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 identifier 50to specify the clock which they consume. 51 52All these identifier could be found in <dt-bindings/clock/hi6220-clock.h>. 53