Re: [PATCH 2/2] arm64: dts: mediatek: mt8188-geralt: enable Wi-Fi card

[Icenowy Zheng <zhengxingda@iscas.ac.cn>]

在 2026-05-04一的 15:34 +0800，Chen-Yu Tsai写道：
> Hi,
> 
> On Mon, May 4, 2026 at 3:28 PM Icenowy Zheng
> <zhengxingda@iscas.ac.cn> wrote:
> > 
> > The mainline pcie-mediatek-gen3 driver does not have code managing
> > downstream device power / reset.
> > 
> > As the Wi-Fi card on ciri is a fixed device, set the related
> > regulator
> > to always-on and use GPIO hog to set the status of its reset pin.
> 
> The plan now is to model it as an M.2 E-key slot (even though the
> chip
> is actually soldered on the main board).

Interestingly I saw a "PCI_PWRCTRL_GENERIC" driver in 7.1, although it
does not support toggling #PERST now -- maybe this should be done and
used instead? (Well it looks like the driver had existed for some time,
but it was for "slots" previously)

Thanks,
Icenowy

> 
> I have some of the patches ready, but I'm still working out the USB
> side of it.
> 
> 
> ChenYu
> 
> > Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
> > ---
> >  arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
> > b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
> > index 8e423504ec052..c25780098103b 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
> > @@ -544,6 +544,11 @@ &mt6359codec {
> >         mediatek,mic-type-2 = <2>; /* DMIC */
> >  };
> > 
> > +&mt6359_vcn18_ldo_reg {
> > +       /* Used by WLAN */
> > +       regulator-always-on;
> > +};
> > +
> >  &mt6359_vcore_buck_reg {
> >         regulator-always-on;
> >  };
> > @@ -1145,6 +1150,12 @@ pins-en-pp3300-wlan {
> >                         output-low;
> >                 };
> >         };
> > +
> > +       wlan-reset-hog {
> > +               gpio-hog;
> > +               gpios = <145 GPIO_ACTIVE_HIGH>;
> > +               output-high;
> > +       };
> >  };
> > 
> >  &pmic {
> > --
> > 2.52.0
> > 
> >