Re: arm64: dts: mt8183: Incorrect mediatek,pull-*-adv values

[Enric Balletbo Serra <eballetbo@xxxxxxxxx>]

Hi Chen-Yu and Hsin-Yi,


Missatge de Chen-Yu Tsai <wenst@xxxxxxxxxxxx> del dia dl., 26 de jul.
2021 a les 10:58:
>
> On Mon, Jul 26, 2021 at 4:50 PM Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> wrote:
> >
> > On Mon, Jul 26, 2021 at 4:20 PM Chen-Yu Tsai <wenst@xxxxxxxxxxxx> wrote:
> > >
> > > Hi,
> > >
> > > I was looking at MTK pinctrl stuff upstream, and it seems there are a few
> > > `mediatek,pull-*-adv` entries that have invalid values:
> > >
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-down-adv = <10>;

The confusion comes probably because the binding says that this value
is valid, see

   Documentation/devicetree/bindings/pinctrl/pinctrl-mt8183.txt

it'd be nice to convert that binding and the others to yaml format and
remove the possibility to specify it in binary format.

  Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt
  Documentation/devicetree/bindings/pinctrl/pinctrl-mt7622.txt
  Documentation/devicetree/bindings/pinctrl/pinctrl-mt6797.txt

Should be pretty easy as there is already an example:
Documentation/devicetree/bindings/pinctrl/mediatek,mt6779-pinctrl.yaml

Thanks,
  Enric

> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-up-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-up-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi:
> > > mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-up-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-down-adv = <10>;
> > > arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dts:
> > >  mediatek,pull-up-adv = <10>;
> > >
> > > According to the bindings, the values should 0~3. <10> is probably a
> > > incorrect attempt at using binary representation, which is wrong. This
> > > probably leads to the pull-up/down getting disabled or ignored.
> > >
> > > Cound people still working on these two devices take a look?
> > >
> > Thanks for pointing this out. It's an incorrect value but 10=0b1010 so
> > the result is same as 2, since the driver test the value by checking
> > the last 2 bit. We should still fix this in dts.
>

I see that the are



> That probably explains why no one noticed.