Re: [PATCH 2/5] arm64: dts: mediatek: cherry: Assign dp-intf aliases

[AngeloGioacchino Del Regno]

Il 24/04/23 09:17, Chen-Yu Tsai ha scritto:
> On Mon, Apr 24, 2023 at 3:03 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
> > Il 21/04/23 08:46, Chen-Yu Tsai ha scritto:
> > > On Thu, Apr 20, 2023 at 5:45 PM AngeloGioacchino Del Regno
> > > <angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
> > > > On Cherry boards, the IP at 0x1c015000 (dp_intf0) is used as primary
> > > > dp-intf, while the other at 0x1c113000 (dp_intf1) is used as secondary:
> > > > assign them to dp-intf{0,1} aliases respectively.
> > > >
> > > > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> > > > ---
> > > >    arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi | 2 ++
> > >
> > > This should be applied at the SoC level. The display pipeline is fixed in
> > > MMSYS, so it applies to all MT8195 devices.
> >
> > It's fixed in the MMSYS configuration/driver but - as far as I remember (I can
> > recheck on the datasheets) - the dp_intfX function can be inverted meaning that
> > the MMSYS paths can be configured such that DP_INTF0 becomes secondary and the
> > other becomes primary: this is why I am putting that into mt8195-cherry and not
> > mt8195.dtsi.
>
> Maybe that's possible, but the diagram in the datasheet suggests a fixed path.
>
> Either way, it's not actually the problem. My original reply is probably
> inaccurate. AFAIK the aliases are used to identify the individual hardware
> blocks, which otherwise have the same compatible string. So the numbering
> should be the same regardless of the design and/or routing.

Ack. Will move to mt8195.dtsi!

> Ideally this should be described with a proper graph though.
>
> ChenYu
>
> > Regards,
> > Angelo
> >
> > > >    1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> > > > index 0820e9ba3829..918380697a9a 100644
> > > > --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> > > > +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> > > > @@ -10,6 +10,8 @@
> > > >
> > > >    / {
> > > >           aliases {
> > > > +               dp-intf0 = &dp_intf0;
> > > > +               dp-intf1 = &dp_intf1;
> > > >                   i2c0 = &i2c0;
> > > >                   i2c1 = &i2c1;
> > > >                   i2c2 = &i2c2;
> > > > --
> > > > 2.40.0