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-aoctrl"
  15         - "hisilicon,hi6220-sysctrl"
  16         - "hisilicon,hi6220-mediactrl"
  17         - "hisilicon,hi6220-pmctrl"
  18         - "hisilicon,hi6220-stub-clk"
  19
  20 - reg: physical base address of the controller and length of memory mapped
  21   region.
  22
  23 - #clock-cells: should be 1.
  24
  25 Optional Properties:
  26
  27 - hisilicon,hi6220-clk-sram: phandle to the syscon managing the SoC internal sram;
  28   the driver need use the sram to pass parameters for frequency change.
  29
  30 - mboxes: use the label reference for the mailbox as the first parameter, the
  31   second parameter is the channel number.
  32
  33 Example 1:
  34         sys_ctrl: sys_ctrl@f7030000 {
  35                 compatible = "hisilicon,hi6220-sysctrl", "syscon";
  36                 reg = <0x0 0xf7030000 0x0 0x2000>;
  37                 #clock-cells = <1>;
  38         };
  39
  40 Example 2:
  41         stub_clock: stub_clock {
  42                 compatible = "hisilicon,hi6220-stub-clk";
  43                 hisilicon,hi6220-clk-sram = <&sram>;
  44                 #clock-cells = <1>;
  45                 mboxes = <&mailbox 1>;
  46         };
  47
  48 Each clock is assigned an identifier and client nodes use this identifier
  49 to specify the clock which they consume.
  50
  51 All these identifier could be found in <dt-bindings/clock/hi6220-clock.h>.