linux-kernel - Re: [PATCH v2 3/3] arm64: dts: renesas: draak: Describe HDMI input

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Message-ID: <20180517090259.ps6ikcgdxxpfr2ac@verge.net.au>
Date:   Thu, 17 May 2018 11:03:00 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     jacopo mondi <jacopo@...ndi.org>
Cc:     Niklas Söderlund <niklas.soderlund@...natech.se>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        laurent.pinchart@...asonboard.com, geert@...der.be,
        magnus.damm@...il.com, robh+dt@...nel.org,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] arm64: dts: renesas: draak: Describe HDMI input

On Thu, May 17, 2018 at 09:14:56AM +0200, jacopo mondi wrote:
> Hi Niklas,
> 
> On Thu, May 17, 2018 at 12:23:18AM +0200, Niklas Söderlund wrote:
> > Hi Jacopo,
> >
> > Thanks for your patch.
> >
> > On 2018-05-16 15:42:09 +0200, Jacopo Mondi wrote:
> > > Describe HDMI input connector and ADV7612 HDMI decoder installed on
> > > R-Car Gen3 Draak board.
> > >
> > > The video signal routing to the HDMI decoder to the video input interface
> > > VIN4 is multiplexed with CVBS input path, and enabled/disabled through
> > > on-board switches SW-49, SW-50, SW-51 and SW-52.
> > >
> > > As the default board switches configuration connects CVBS input to VIN4,
> > > leave the HDMI decoder unconnected in DTS.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> >
> > I'm not sure we have a policy about describing hardware which can't be
> > used without flipping switches. I have no opinion on if we should do
> > that or not I leave that to others, but for the change itself.
> >
> > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> >
> 
> Thanks
> 
> > I think it's good we describe it as it's part of the Draak board itself
> > and not an expansion board which we have seen a lot of :-) Maybe even
> > add a commented out line in the adv7612 port@2 which hints which VIN
> > this is connected to if the switches are flipped?
> 
> The only VIN instance that's on Draak, VIN4.
> 
> I can add a comment that describes the switch settings that enables
> the HDMI video capture path.

That sounds like a good plan to me.