Documentation/devicetree/bindings/clock/hi6220-clock.txt

   1 * Hisilicon Hi6220 Clock Controller
   2
   3 Clock control registers reside in different Hi6220 system controllers,
   4 please refer the following document to know more about the binding rules
   5 for these system controllers:
   6
   7 Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
   8
   9 Required 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
  26 Optional 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
  34 Example 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
  41 Example 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
  49 Each clock is assigned an identifier and client nodes use this identifier
  50 to specify the clock which they consume.
  51
  52 All these identifier could be found in <dt-bindings/clock/hi6220-clock.h>.