Re: [PATCH 6/7] ARM: dts: r8a7742: Add LVDS support

From: Geert Uytterhoeven <geert@linux-m68k.org>
To: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
	David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>,
	Magnus Damm <magnus.damm@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>
Subject: Re: [PATCH 6/7] ARM: dts: r8a7742: Add LVDS support
Date: Mon, 10 Aug 2020 10:27:24 +0200	[thread overview]
Message-ID: <CAMuHMdXH_ttYNrKpMxxkSTvhYcxkCD6v_ueXMGN6mXhkbpoyPA@mail.gmail.com> (raw)
In-Reply-To: <CA+V-a8v0nXwe0iN2ymqE5YgcgOymWYv-Xf6N+rw_nJnUgx4yMQ@mail.gmail.com>

Hi Prabhakar, Laurent,

On Sun, Aug 9, 2020 at 11:30 PM Lad, Prabhakar
<prabhakar.csengg@gmail.com> wrote:
> On Sat, Aug 8, 2020 at 10:13 PM Laurent Pinchart
> <laurent.pinchart@ideasonboard.com> wrote:
> > On Fri, Aug 07, 2020 at 06:49:53PM +0100, Lad Prabhakar wrote:
> > > Add LVDS encoder node to r8a7742 SoC DT.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
> > > ---
> > >  arch/arm/boot/dts/r8a7742.dtsi | 54 ++++++++++++++++++++++++++++++++++
> > >  1 file changed, 54 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/r8a7742.dtsi b/arch/arm/boot/dts/r8a7742.dtsi
> > > index a979a4b3de61..a7e66220d63a 100644
> > > --- a/arch/arm/boot/dts/r8a7742.dtsi
> > > +++ b/arch/arm/boot/dts/r8a7742.dtsi
> > > @@ -1534,11 +1534,65 @@
> > >                               port@1 {
> > >                                       reg = <1>;
> > >                                       du_out_lvds0: endpoint {
> > > +                                             remote-endpoint = <&lvds0_in>;
> > >                                       };
> > >                               };
> > >                               port@2 {
> > >                                       reg = <2>;
> > >                                       du_out_lvds1: endpoint {
> > > +                                             remote-endpoint = <&lvds1_in>;
> > > +                                     };
> > > +                             };
> > > +                     };
> > > +             };
> > > +
> > > +             lvds0: lvds@feb90000 {
> > > +                     compatible = "renesas,r8a7742-lvds";
> > > +                     reg = <0 0xfeb90000 0 0x1c>;
> >
> > Isn't 0x14 enough for the size ? 0x1c won't hurt though. Same comment
> > below.

I can fix that while applying.

> Agreed, 0x1c comes from Gen-3 manuals.

All R-Car Gen3 and RZ/G2 .dtsi use 0x14 or 0x20.
All R-Car Gen2 and RZ/G1 .dtsi use 0x1c, but their manual suggests 0x14, too?

Doesn't matter much, as the hardware address decoder probably uses a
multiple of 2, and page mapping granularity is at least 4 KiB anyway.

> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v5.10, with the above fixed.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds