[PATCH v7 1/2] dt-binding: hwmon: Add NPCM7xx PWM and Fan controller documentation

[Tomer Maimon]

Hi Rob,

Thanks for your review

On 3 July 2018 at 19:45, Rob Herring <robh at kernel.org> wrote:

> On Tue, Jul 03, 2018 at 12:47:00PM +0300, Tomer Maimon wrote:
> > Added device tree binding documentation for Nuvoton BMC
> > NPCM7xx Pulse Width Modulation (PWM)  and Fan tach controller.
> > The PWM controller can support upto 8 PWM output ports.
> > The Fan tach controller can support upto 16 tachometer inputs.
> >
> > Signed-off-by: Tomer Maimon <tmaimon77 at gmail.com>
> > ---
> >  .../devicetree/bindings/hwmon/npcm750-pwm-fan.txt  | 87
> ++++++++++++++++++++++
> >  1 file changed, 87 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/npcm750-pwm-
> fan.txt
> >
> > diff --git a/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
> b/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
> > new file mode 100644
> > index 000000000000..c56d72d03717
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
> > @@ -0,0 +1,87 @@
> > +Nuvoton NPCM7xx PWM and Fan Tacho controller device
> > +
> > +The NPCM7xx has two identical Pulse-width modulation (PWM) controller
> modules,
> > +Each PWM module has four PWM controller outputs, Totally 8 PWM
> controller outputs.
>
> Kind of sounds like this should be 2 nodes then?
>

we preferred one node, I think the channel description it little
confusing... i will rewrite it to
" The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)
controller outputs and 16 Fan tachometer controller inputs."


> > +
> > +The NPCM7xx has eight identical Fan tachometer controller modules,
> > +Each Fan module has two Fan controller inputs, Totally 16 Fan
> 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
> > +                                     * "clk_apb3" for clock of PWM
> controller.
> > +                                     * "clk_apb4" for clock of Fan
> controller.
>
> The "clk_" part is redundant.
>
> Also, this should be the names of the clocks in the module, not the name
> of the source clocks. It seems like these may be the latter?
>
will change to "pwm" and "fan"

>
> > +- 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 at 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 = "clk_apb3","clk_apb4";
> > +     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 at 0 {
> > +             reg = <0x00>;
> > +             fan-ch = /bits/ 8 <0x00 0x01>;
>
> Doesn't match the doc.
>
> > +             cooling-levels = <127 255>;
> > +     };
> > +     fan at 1 {
> > +             reg = <0x01>;
> > +             fan-ch = /bits/ 8 <0x02 0x03>;
> > +     };
> > +     fan at 2 {
> > +             reg = <0x02>;
> > +             fan-ch = /bits/ 8 <0x04>;
> > +     };
> > +
> > +};
> > \ No newline at end of file
> > --
> > 2.14.1
> >
>

Thanks a lot

Tomer
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