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1Nuvoton NPCM PWM and Fan Tacho controller device2 3The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)4controller outputs and 16 Fan tachometer controller inputs.5 6The Nuvoton BMC NPCM8XX supports 12 Pulse-width modulation (PWM)7controller outputs and 16 Fan tachometer controller inputs.8 9Required properties for pwm-fan node10- #address-cells : should be 1.11- #size-cells : should be 0.12- compatible : "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX.13 : "nuvoton,npcm845-pwm-fan" for Arbel NPCM8XX.14- reg : specifies physical base address and size of the registers.15- reg-names : must contain:16 * "pwm" for the PWM registers.17 * "fan" for the Fan registers.18- clocks : phandle of reference clocks.19- clock-names : must contain20 * "pwm" for PWM controller operating clock.21 * "fan" for Fan controller operating clock.22- interrupts : contain the Fan interrupts with flags for falling edge.23- pinctrl-names : a pinctrl state named "default" must be defined.24- pinctrl-0 : phandle referencing pin configuration of the PWM and Fan25 controller ports.26 27fan subnode format:28===================29Under fan subnode can be upto 8 child nodes, each child node representing a fan.30Each fan subnode must have one PWM channel and at least one Fan tach channel.31 32For PWM channel can be configured cooling-levels to create cooling device.33Cooling device could be bound to a thermal zone for the thermal control.34 35Required properties for each child node:36- reg : specify the PWM output channel.37 integer value in the range 0 through 7, that represent38 the PWM channel number that used.39 40- fan-tach-ch : specify the Fan tach input channel.41 integer value in the range 0 through 15, that represent42 the fan tach channel number that used.43 44 At least one Fan tach input channel is required45 46Optional property for each child node:47- cooling-levels: PWM duty cycle values in a range from 0 to 25548 which correspond to thermal cooling states.49 50Examples:51 52pwm_fan:pwm-fan-controller@103000 {53 #address-cells = <1>;54 #size-cells = <0>;55 compatible = "nuvoton,npcm750-pwm-fan";56 reg = <0x103000 0x2000>,57 <0x180000 0x8000>;58 reg-names = "pwm", "fan";59 clocks = <&clk NPCM7XX_CLK_APB3>,60 <&clk NPCM7XX_CLK_APB4>;61 clock-names = "pwm","fan";62 interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,63 <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,64 <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,65 <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,66 <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,67 <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,68 <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,69 <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;70 pinctrl-names = "default";71 pinctrl-0 = <&pwm0_pins &pwm1_pins &pwm2_pins72 &fanin0_pins &fanin1_pins &fanin2_pins73 &fanin3_pins &fanin4_pins>;74 fan@0 {75 reg = <0x00>;76 fan-tach-ch = /bits/ 8 <0x00 0x01>;77 cooling-levels = <127 255>;78 };79 fan@1 {80 reg = <0x01>;81 fan-tach-ch = /bits/ 8 <0x02 0x03>;82 };83 fan@2 {84 reg = <0x02>;85 fan-tach-ch = /bits/ 8 <0x04>;86 };87 88};89