linux-kernel - Re: [PATCH v4 4/7] arm64: dts: renesas: r8a77970: Add csi40 port@0

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Message-ID: <YHiPZCjChv2iZ4/y@pendragon.ideasonboard.com>
Date:   Thu, 15 Apr 2021 22:09:24 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Subject: Re: [PATCH v4 4/7] arm64: dts: renesas: r8a77970: Add csi40 port@0

On Thu, Apr 15, 2021 at 06:47:48PM +0200, Geert Uytterhoeven wrote:
> On Thu, Apr 15, 2021 at 4:47 PM Laurent Pinchart wrote:
> > On Thu, Apr 15, 2021 at 02:25:59PM +0200, Jacopo Mondi wrote:
> > > Declare port@0 in the csi40 device node and leave it un-connected.
> > > Each board .dts file will connect the port as it requires.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> >
> > The port exists at the hardware level, so including it here sounds good.
> > The DT binding even makes the port mandatory :-)
> 
> But the latter is subject to change?
> 
> [PATCH] media: dt-bindings: media: renesas,csi2: Node port@0 is not mandatory
> https://lore.kernel.org/linux-devicetree/20210413155346.2471776-1-niklas.soderlund+renesas@ragnatech.se/

I've replied to that patch, it's not a good idea.

> > > --- a/arch/arm64/boot/dts/renesas/r8a77970.dtsi
> > > +++ b/arch/arm64/boot/dts/renesas/r8a77970.dtsi
> > > @@ -1106,6 +1106,10 @@ ports {
> > >                               #address-cells = <1>;
> > >                               #size-cells = <0>;
> > >
> > > +                             port@0 {
> > > +                                     reg = <0>;
> > > +                             };
> > > +
> > >                               port@1 {
> > >                                       #address-cells = <1>;
> > >                                       #size-cells = <0>;

-- 
Regards,

Laurent Pinchart