aspeed-pwm-tacho.txt

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    1 ASPEED AST2400/AST2500 PWM and Fan Tacho controller device driver
    2 
    3 The ASPEED PWM controller can support upto 8 PWM outputs. The ASPEED Fan Tacho
    4 controller can support upto 16 Fan tachometer inputs.
    5 
    6 There can be upto 8 fans supported. Each fan can have one PWM output and
    7 one/two Fan tach inputs.
    8 
    9 Required properties for pwm-tacho node:
   10 - #address-cells : should be 1.
   11 
   12 - #size-cells : should be 1.
   13 
   14 - #cooling-cells: should be 2.
   15 
   16 - reg : address and length of the register set for the device.
   17 
   18 - pinctrl-names : a pinctrl state named "default" must be defined.
   19 
   20 - pinctrl-0 : phandle referencing pin configuration of the PWM ports.
   21 
   22 - compatible : should be "aspeed,ast2400-pwm-tacho" for AST2400 and
   23                "aspeed,ast2500-pwm-tacho" for AST2500.
   24 
   25 - clocks : phandle to clock provider with the clock number in the second cell
   26 
   27 - resets : phandle to reset controller with the reset number in the second cell
   28 
   29 fan subnode format:
   30 ===================
   31 Under fan subnode there can upto 8 child nodes, with each child node
   32 representing a fan. If there are 8 fans each fan can have one PWM port and
   33 one/two Fan tach inputs.
   34 For PWM port can be configured cooling-levels to create cooling device.
   35 Cooling device could be bound to a thermal zone for the thermal control.
   36 
   37 Required properties for each child node:
   38 - reg : should specify PWM source port.
   39         integer value in the range 0 to 7 with 0 indicating PWM port A and
   40         7 indicating PWM port H.
   41 
   42 - cooling-levels: PWM duty cycle values in a range from 0 to 255
   43                   which correspond to thermal cooling states.
   44 
   45 - aspeed,fan-tach-ch : should specify the Fan tach input channel.
   46                 integer value in the range 0 through 15, with 0 indicating
   47                 Fan tach channel 0 and 15 indicating Fan tach channel 15.
   48                 Atleast one Fan tach input channel is required.
   49 
   50 Examples:
   51 
   52 pwm_tacho: pwmtachocontroller@1e786000 {
   53         #address-cells = <1>;
   54         #size-cells = <1>;
   55         #cooling-cells = <2>;
   56         reg = <0x1E786000 0x1000>;
   57         compatible = "aspeed,ast2500-pwm-tacho";
   58         clocks = <&syscon ASPEED_CLK_APB>;
   59         resets = <&syscon ASPEED_RESET_PWM>;
   60         pinctrl-names = "default";
   61         pinctrl-0 = <&pinctrl_pwm0_default &pinctrl_pwm1_default>;
   62 
   63         fan@0 {
   64                 reg = <0x00>;
   65                 cooling-levels = /bits/ 8 <125 151 177 203 229 255>;
   66                 aspeed,fan-tach-ch = /bits/ 8 <0x00>;
   67         };
   68 
   69         fan@1 {
   70                 reg = <0x01>;
   71                 aspeed,fan-tach-ch = /bits/ 8 <0x01 0x02>;
   72         };
   73 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/hwmon/aspeed-pwm-tacho.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/hwmon/aspeed-pwm-tacho.txt