1Nuvoton NPCM7xx PWM and Fan Tacho controller device 2 3The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM) 4controller outputs and 16 Fan tachometer controller inputs. 5 6Required properties for pwm-fan node 7- #address-cells : should be 1. 8- #size-cells : should be 0. 9- compatible : "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX. 10- reg : specifies physical base address and size of the registers. 11- reg-names : must contain: 12 * "pwm" for the PWM registers. 13 * "fan" for the Fan registers. 14- clocks : phandle of reference clocks. 15- clock-names : must contain 16 * "pwm" for PWM controller operating clock. 17 * "fan" for Fan controller operating clock. 18- interrupts : contain the Fan interrupts with flags for falling edge. 19- pinctrl-names : a pinctrl state named "default" must be defined. 20- pinctrl-0 : phandle referencing pin configuration of the PWM and Fan 21 controller ports. 22 23fan subnode format: 24=================== 25Under fan subnode can be upto 8 child nodes, each child node representing a fan. 26Each fan subnode must have one PWM channel and atleast one Fan tach channel. 27 28For PWM channel can be configured cooling-levels to create cooling device. 29Cooling device could be bound to a thermal zone for the thermal control. 30 31Required properties for each child node: 32- reg : specify the PWM output channel. 33 integer value in the range 0 through 7, that represent 34 the PWM channel number that used. 35 36- fan-tach-ch : specify the Fan tach input channel. 37 integer value in the range 0 through 15, that represent 38 the fan tach channel number that used. 39 40 At least one Fan tach input channel is required 41 42Optional property for each child node: 43- cooling-levels: PWM duty cycle values in a range from 0 to 255 44 which correspond to thermal cooling states. 45 46Examples: 47 48pwm_fan:pwm-fan-controller@103000 { 49 #address-cells = <1>; 50 #size-cells = <0>; 51 compatible = "nuvoton,npcm750-pwm-fan"; 52 reg = <0x103000 0x2000>, 53 <0x180000 0x8000>; 54 reg-names = "pwm", "fan"; 55 clocks = <&clk NPCM7XX_CLK_APB3>, 56 <&clk NPCM7XX_CLK_APB4>; 57 clock-names = "pwm","fan"; 58 interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>, 59 <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>, 60 <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>, 61 <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>, 62 <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>, 63 <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>, 64 <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>, 65 <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>; 66 pinctrl-names = "default"; 67 pinctrl-0 = <&pwm0_pins &pwm1_pins &pwm2_pins 68 &fanin0_pins &fanin1_pins &fanin2_pins 69 &fanin3_pins &fanin4_pins>; 70 fan@0 { 71 reg = <0x00>; 72 fan-tach-ch = /bits/ 8 <0x00 0x01>; 73 cooling-levels = <127 255>; 74 }; 75 fan@1 { 76 reg = <0x01>; 77 fan-tach-ch = /bits/ 8 <0x02 0x03>; 78 }; 79 fan@2 { 80 reg = <0x02>; 81 fan-tach-ch = /bits/ 8 <0x04>; 82 }; 83 84}; 85