kernel/Documentation/devicetree/bindings/clock/ti/dpll.txt

   1 Binding for Texas Instruments DPLL clock.
   2
   3 Binding status: Unstable - ABI compatibility may be broken in the future
   4
   5 This binding uses the common clock binding[1].  It assumes a
   6 register-mapped DPLL with usually two selectable input clocks
   7 (reference clock and bypass clock), with digital phase locked
   8 loop logic for multiplying the input clock to a desired output
   9 clock. This clock also typically supports different operation
  10 modes (locked, low power stop etc.) This binding has several
  11 sub-types, which effectively result in slightly different setup
  12 for the actual DPLL clock.
  13
  14 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
  15
  16 Required properties:
  17 - compatible : shall be one of:
  18                 "ti,omap3-dpll-clock",
  19                 "ti,omap3-dpll-core-clock",
  20                 "ti,omap3-dpll-per-clock",
  21                 "ti,omap3-dpll-per-j-type-clock",
  22                 "ti,omap4-dpll-clock",
  23                 "ti,omap4-dpll-x2-clock",
  24                 "ti,omap4-dpll-core-clock",
  25                 "ti,omap4-dpll-m4xen-clock",
  26                 "ti,omap4-dpll-j-type-clock",
  27                 "ti,omap5-mpu-dpll-clock",
  28                 "ti,am3-dpll-no-gate-clock",
  29                 "ti,am3-dpll-j-type-clock",
  30                 "ti,am3-dpll-no-gate-j-type-clock",
  31                 "ti,am3-dpll-clock",
  32                 "ti,am3-dpll-core-clock",
  33                 "ti,am3-dpll-x2-clock",
  34                 "ti,omap2-dpll-core-clock",
  35
  36 - #clock-cells : from common clock binding; shall be set to 0.
  37 - clocks : link phandles of parent clocks, first entry lists reference clock
  38   and second entry bypass clock
  39 - reg : offsets for the register set for controlling the DPLL.
  40   Registers are listed in following order:
  41         "control" - contains the control register base address
  42         "idlest" - contains the idle status register base address
  43         "mult-div1" - contains the multiplier / divider register base address
  44         "autoidle" - contains the autoidle register base address (optional)
  45   ti,am3-* dpll types do not have autoidle register
  46   ti,omap2-* dpll type does not support idlest / autoidle registers
  47
  48 Optional properties:
  49 - DPLL mode setting - defining any one or more of the following overrides
  50   default setting.
  51         - ti,low-power-stop : DPLL supports low power stop mode, gating output
  52         - ti,low-power-bypass : DPLL output matches rate of parent bypass clock
  53         - ti,lock : DPLL locks in programmed rate
  54
  55 Examples:
  56         dpll_core_ck: dpll_core_ck@44e00490 {
  57                 #clock-cells = <0>;
  58                 compatible = "ti,omap4-dpll-core-clock";
  59                 clocks = <&sys_clkin_ck>, <&sys_clkin_ck>;
  60                 reg = <0x490>, <0x45c>, <0x488>, <0x468>;
  61         };
  62
  63         dpll2_ck: dpll2_ck@48004004 {
  64                 #clock-cells = <0>;
  65                 compatible = "ti,omap3-dpll-clock";
  66                 clocks = <&sys_ck>, <&dpll2_fck>;
  67                 ti,low-power-stop;
  68                 ti,low-power-bypass;
  69                 ti,lock;
  70                 reg = <0x4>, <0x24>, <0x34>, <0x40>;
  71         };
  72
  73         dpll_core_ck: dpll_core_ck@44e00490 {
  74                 #clock-cells = <0>;
  75                 compatible = "ti,am3-dpll-core-clock";
  76                 clocks = <&sys_clkin_ck>, <&sys_clkin_ck>;
  77                 reg = <0x90>, <0x5c>, <0x68>;
  78         };
  79
  80         dpll_ck: dpll_ck {
  81                 #clock-cells = <0>;
  82                 compatible = "ti,omap2-dpll-core-clock";
  83                 clocks = <&sys_ck>, <&sys_ck>;
  84                 reg = <0x0500>, <0x0540>;
  85         };