Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt

   1 * Renesas R8A7778 Clock Pulse Generator (CPG)
   2
   3 The CPG generates core clocks for the R8A7778. It includes two PLLs and
   4 several fixed ratio dividers.
   5 The CPG also provides a Clock Domain for SoC devices, in combination with the
   6 CPG Module Stop (MSTP) Clocks.
   7
   8 Required Properties:
   9
  10   - compatible: Must be "renesas,r8a7778-cpg-clocks"
  11   - reg: Base address and length of the memory resource used by the CPG
  12   - #clock-cells: Must be 1
  13   - clock-output-names: The names of the clocks. Supported clocks are
  14     "plla", "pllb", "b", "out", "p", "s", and "s1".
  15   - #power-domain-cells: Must be 0
  16
  17 SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed
  18 through an MSTP clock should refer to the CPG device node in their
  19 "power-domains" property, as documented by the generic PM domain bindings in
  20 Documentation/devicetree/bindings/power/power_domain.txt.
  21
  22
  23 Examples
  24 --------
  25
  26   - CPG device node:
  27
  28         cpg_clocks: cpg_clocks@ffc80000 {
  29                 compatible = "renesas,r8a7778-cpg-clocks";
  30                 reg = <0xffc80000 0x80>;
  31                 #clock-cells = <1>;
  32                 clocks = <&extal_clk>;
  33                 clock-output-names = "plla", "pllb", "b",
  34                                      "out", "p", "s", "s1";
  35                 #power-domain-cells = <0>;
  36         };
  37
  38
  39   - CPG/MSTP Clock Domain member device node:
  40
  41         sdhi0: sd@ffe4c000 {
  42                 compatible = "renesas,sdhi-r8a7778";
  43                 reg = <0xffe4c000 0x100>;
  44                 interrupts = <0 87 IRQ_TYPE_LEVEL_HIGH>;
  45                 clocks = <&mstp3_clks R8A7778_CLK_SDHI0>;
  46                 power-domains = <&cpg_clocks>;
  47                 status = "disabled";
  48         };