Re: [PATCH V4 3/5] arm64: dts: nuvoton: Add initial support for MA35D1

[Jacky Huang]

On 2022/5/13 下午 02:57, Krzysztof Kozlowski wrote:
> On 13/05/2022 08:48, Jacky Huang wrote:
> > > > +
> > > > +	hxt_24m: hxt_24mhz {
> > > No underscores in node name. Generic node names, so "clock-X" or
> > > "clock-some-suffix"
> > OK, I will modify it as
> >    hxt-24m: hxt-24mhz
> No, it is not a generic node name. Please read my reply again.

I  would modify it as

   clock-hxt: clock-hspd-ext-crystal


> > > > +		compatible = "fixed-clock";
> > > > +		#clock-cells = <0>;
> > > > +		clock-frequency = <24000000>;
> > > This does not look like property of SoC. Where is this clock defined? In
> > > the SoC or on the board?
> > It's an external crystal on the board.
> > I add this node, because it's the clock source of clock controller.
> > It always present on all ma35d1 boards.
> >
> >       clk: clock-controller@40460200 {
> >           compatible = "nuvoton,ma35d1-clk";
> >           reg = <0x0 0x40460200 0x0 0x100>;
> >           #clock-cells = <1>;
> >           clocks = <&hxt_24m>;
> >           clock-names = "HXT_24MHz";
> > ...
> >
> > > > +		clock-output-names = "HXT_24MHz";
> > > > +	};
> > > > +
> > > > +	timer {
> > > > +		compatible = "arm,armv8-timer";
> > > > +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
> > > > +					  IRQ_TYPE_LEVEL_LOW)>,
> > > > +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) |
> > > > +					  IRQ_TYPE_LEVEL_LOW)>,
> > > > +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) |
> > > > +					  IRQ_TYPE_LEVEL_LOW)>,
> > > > +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) |
> > > > +					  IRQ_TYPE_LEVEL_LOW)>;
> > > > +		clock-frequency = <12000000>;
> > > > +	};
> > > > +
> > > > +	sys: system-controller@40460000 {
> > > > +		compatible = "nuvoton,ma35d1-sys", "syscon", "simple-mfd";
> > > Why is this a simple-mfd if there are no children here? What do you want
> > > to instantiate here?
> > It's not a device, but a set of registers for system level control.
> > I want to provide a register base mapping for other devices to access
> > system control registers.
> This does not explain why you need simple-mfd. simple-mfd is not for
> providing a register base mapping for other devices.


OK, I will remove the "simple-mfd" from sys node.


> > > Where is the nuvoton,ma35d1-sys compatible documented?
> > OK, I will add the compatible document in next version.
> >
> >
> > > > +		reg = <0x0 0x40460000 0x0 0x400>;
> > > > +	};
> > > > +
> > > > +	reset: reset-controller {
> > > > +		compatible = "nuvoton,ma35d1-reset";
> > > Also not documented.
> > I will also add the document for it.
> All of these should fail on checkpatch which points that you either did
> not run it or ignored the result.
>
> Please run checkpatch on all your submissions to Linux kernel and be
> sure that there is no warning or error.
>
>
>
> Best regards,
> Krzysztof


Sure, thank you for reminding.


Sincerely,.

Jacky Huang