Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt

   1 Generic CPU0 cpufreq driver
   2
   3 It is a generic cpufreq driver for CPU0 frequency management.  It
   4 supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
   5 systems which share clock and voltage across all CPUs.
   6
   7 Both required and optional properties listed below must be defined
   8 under node /cpus/cpu@0.
   9
  10 Required properties:
  11 - operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt
  12   for details
  13
  14 Optional properties:
  15 - clock-latency: Specify the possible maximum transition latency for clock,
  16   in unit of nanoseconds.
  17 - voltage-tolerance: Specify the CPU voltage tolerance in percentage.
  18
  19 Examples:
  20
  21 cpus {
  22         #address-cells = <1>;
  23         #size-cells = <0>;
  24
  25         cpu@0 {
  26                 compatible = "arm,cortex-a9";
  27                 reg = <0>;
  28                 next-level-cache = <&L2>;
  29                 operating-points = <
  30                         /* kHz    uV */
  31                         792000  1100000
  32                         396000  950000
  33                         198000  850000
  34                 >;
  35                 transition-latency = <61036>; /* two CLK32 periods */
  36         };
  37
  38         cpu@1 {
  39                 compatible = "arm,cortex-a9";
  40                 reg = <1>;
  41                 next-level-cache = <&L2>;
  42         };
  43
  44         cpu@2 {
  45                 compatible = "arm,cortex-a9";
  46                 reg = <2>;
  47                 next-level-cache = <&L2>;
  48         };
  49
  50         cpu@3 {
  51                 compatible = "arm,cortex-a9";
  52                 reg = <3>;
  53                 next-level-cache = <&L2>;
  54         };
  55 };