Hi Laurent,
Thanks for the feedback.
> Subject: Re: [PATCH] ARM: dts: iwg20d-q7-common: Fix touch controller
> probe failure
>
> Hi Biju,
>
> Thank you for the patch.
>
> On Fri, Aug 07, 2020 at 04:20:38PM +0100, Biju Das wrote:
> > Remove powerdown-gpios property from lvds-receiver node as it results
> > in touch controller driver probe failure.
> > As per the iWave RZ/G1M schematic, the signal LVDS_PPEN controls
> > supply voltage for touch panel, LVDS receiver and RGB LCD panel.
>
> If it controls the supply voltage, shouldn't it be modelled as a regulator ?
> Dropping it completely would rely on the boot loader powering the display
> on and keeping it powered, which isn't very nice.
On the schematic LVDS_PPEN, controls the voltage VCC_3V3_TFT1, which supplies voltage to
LVDS receiver, Touch controller and RGB LCD Panel.
I agree, it should be modelled as a regulator and this regulator should present in
all these devices nodes right(LVDS receiver, Touch controller and RGB LCD Panel),
not just on LVDS receiver node? Please share your views on this.
Cheers,
Biju
>
> > Fixes: 6f89dd9e9325 ("ARM: dts: iwg20d-q7-common: Add LCD support")
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-
> lad.rj@xxxxxxxxxxxxxx>
> > ---
> > arch/arm/boot/dts/iwg20d-q7-common.dtsi | 1 -
> > 1 file changed, 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > index ebbe1518ef8a..4c8b9a6b0125 100644
> > --- a/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > +++ b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
> > @@ -57,7 +57,6 @@
> >
> > lvds-receiver {
> > compatible = "ti,ds90cf384a", "lvds-decoder";
> > -powerdown-gpios = <&gpio7 25 GPIO_ACTIVE_LOW>;
> >
> > ports {
> > #address-cells = <1>;
>
> --
> Regards,
>
> Laurent Pinchart
Renesas Electronics Europe GmbH, Geschaeftsfuehrer/President: Carsten Jauch, Sitz der Gesellschaft/Registered office: Duesseldorf, Arcadiastrasse 10, 40472 Duesseldorf, Germany, Handelsregister/Commercial Register: Duesseldorf, HRB 3708 USt-IDNr./Tax identification no.: DE 119353406 WEEE-Reg.-Nr./WEEE reg. no.: DE 14978647
