85 lines
2.7 KiB
Plaintext
85 lines
2.7 KiB
Plaintext
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Nuvoton NPCM7xx PWM and Fan Tacho controller device
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The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)
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controller outputs and 16 Fan tachometer controller inputs.
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Required properties for pwm-fan node
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- #address-cells : should be 1.
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- #size-cells : should be 0.
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- compatible : "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX.
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- reg : specifies physical base address and size of the registers.
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- reg-names : must contain:
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* "pwm" for the PWM registers.
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* "fan" for the Fan registers.
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- clocks : phandle of reference clocks.
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- clock-names : must contain
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* "pwm" for PWM controller operating clock.
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* "fan" for Fan controller operating clock.
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- interrupts : contain the Fan interrupts with flags for falling edge.
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- pinctrl-names : a pinctrl state named "default" must be defined.
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- pinctrl-0 : phandle referencing pin configuration of the PWM and Fan
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controller ports.
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fan subnode format:
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===================
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Under fan subnode can be upto 8 child nodes, each child node representing a fan.
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Each fan subnode must have one PWM channel and atleast one Fan tach channel.
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For PWM channel can be configured cooling-levels to create cooling device.
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Cooling device could be bound to a thermal zone for the thermal control.
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Required properties for each child node:
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- reg : specify the PWM output channel.
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integer value in the range 0 through 7, that represent
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the PWM channel number that used.
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- fan-tach-ch : specify the Fan tach input channel.
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integer value in the range 0 through 15, that represent
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the fan tach channel number that used.
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At least one Fan tach input channel is required
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Optional property for each child node:
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- cooling-levels: PWM duty cycle values in a range from 0 to 255
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which correspond to thermal cooling states.
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Examples:
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pwm_fan:pwm-fan-controller@103000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "nuvoton,npcm750-pwm-fan";
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reg = <0x103000 0x2000>,
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<0x180000 0x8000>;
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reg-names = "pwm", "fan";
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clocks = <&clk NPCM7XX_CLK_APB3>,
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<&clk NPCM7XX_CLK_APB4>;
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clock-names = "pwm","fan";
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interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
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pinctrl-names = "default";
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pinctrl-0 = <&pwm0_pins &pwm1_pins &pwm2_pins
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&fanin0_pins &fanin1_pins &fanin2_pins
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&fanin3_pins &fanin4_pins>;
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fan@0 {
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reg = <0x00>;
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fan-tach-ch = /bits/ 8 <0x00 0x01>;
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cooling-levels = <127 255>;
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};
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fan@1 {
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reg = <0x01>;
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fan-tach-ch = /bits/ 8 <0x02 0x03>;
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};
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fan@2 {
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reg = <0x02>;
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fan-tach-ch = /bits/ 8 <0x04>;
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};
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};
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