Based on kernel version 6.11
. Page generated on 2024-09-24 08:21 EST
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | Nuvoton NPCM PWM and Fan Tacho controller device The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM) controller outputs and 16 Fan tachometer controller inputs. The Nuvoton BMC NPCM8XX supports 12 Pulse-width modulation (PWM) controller outputs and 16 Fan tachometer controller inputs. Required properties for pwm-fan node - #address-cells : should be 1. - #size-cells : should be 0. - compatible : "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX. : "nuvoton,npcm845-pwm-fan" for Arbel NPCM8XX. - reg : specifies physical base address and size of the registers. - reg-names : must contain: * "pwm" for the PWM registers. * "fan" for the Fan registers. - clocks : phandle of reference clocks. - clock-names : must contain * "pwm" for PWM controller operating clock. * "fan" for Fan controller operating clock. - interrupts : contain the Fan interrupts with flags for falling edge. - pinctrl-names : a pinctrl state named "default" must be defined. - pinctrl-0 : phandle referencing pin configuration of the PWM and Fan controller ports. fan subnode format: =================== Under fan subnode can be upto 8 child nodes, each child node representing a fan. Each fan subnode must have one PWM channel and at least one Fan tach channel. For PWM channel can be configured cooling-levels to create cooling device. Cooling device could be bound to a thermal zone for the thermal control. Required properties for each child node: - reg : specify the PWM output channel. integer value in the range 0 through 7, that represent the PWM channel number that used. - fan-tach-ch : specify the Fan tach input channel. integer value in the range 0 through 15, that represent the fan tach channel number that used. At least one Fan tach input channel is required Optional property for each child node: - cooling-levels: PWM duty cycle values in a range from 0 to 255 which correspond to thermal cooling states. Examples: pwm_fan:pwm-fan-controller@103000 { #address-cells = <1>; #size-cells = <0>; compatible = "nuvoton,npcm750-pwm-fan"; reg = <0x103000 0x2000>, <0x180000 0x8000>; reg-names = "pwm", "fan"; clocks = <&clk NPCM7XX_CLK_APB3>, <&clk NPCM7XX_CLK_APB4>; clock-names = "pwm","fan"; interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>; pinctrl-names = "default"; pinctrl-0 = <&pwm0_pins &pwm1_pins &pwm2_pins &fanin0_pins &fanin1_pins &fanin2_pins &fanin3_pins &fanin4_pins>; fan@0 { reg = <0x00>; fan-tach-ch = /bits/ 8 <0x00 0x01>; cooling-levels = <127 255>; }; fan@1 { reg = <0x01>; fan-tach-ch = /bits/ 8 <0x02 0x03>; }; fan@2 { reg = <0x02>; fan-tach-ch = /bits/ 8 <0x04>; }; }; |