85 lines
2.7 KiB
Plaintext
85 lines
2.7 KiB
Plaintext
Nuvoton NPCM7xx PWM and Fan Tacho controller device
|
|
|
|
The Nuvoton BMC NPCM7XX supports 8 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.
|
|
- 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 atleast 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>;
|
|
};
|
|
|
|
};
|