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

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Date:   Thu, 17 May 2018 09:14:56 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Niklas Söderlund <niklas.soderlund@...natech.se>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        laurent.pinchart@...asonboard.com, horms@...ge.net.au,
        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

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.

Thanks
   j


>
> > ---
> >  arch/arm64/boot/dts/renesas/r8a77995-draak.dts | 38 ++++++++++++++++++++++++++
> >  1 file changed, 38 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > index 9aba28f..ea99dc9 100644
> > --- a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > +++ b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > @@ -59,6 +59,17 @@
> >  		};
> >  	};
> >
> > +	hdmi-in {
> > +		compatible = "hdmi-connector";
> > +		type = "a";
> > +
> > +		port {
> > +			hdmi_con_in: endpoint {
> > +				remote-endpoint = <&adv7612_in>;
> > +			};
> > +		};
> > +	};
> > +
> >  	memory@...00000 {
> >  		device_type = "memory";
> >  		/* first 128MB is reserved for secure area. */
> > @@ -170,6 +181,33 @@
> >  			};
> >  		};
> >  	};
> > +
> > +	hdmi-decoder@4c {
> > +		compatible = "adi,adv7612";
> > +		reg = <0x4c>;
> > +		default-input = <0>;
> > +
> > +		ports {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			port@0 {
> > +				reg = <0>;
> > +				adv7612_in: endpoint {
> > +					remote-endpoint = <&hdmi_con_in>;
> > +				};
> > +			};
> > +
> > +			port@2 {
> > +				reg = <2>;
> > +				adv7612_out: endpoint {
> > +					pclk-sample = <0>;
> > +					hsync-active = <0>;
> > +					vsync-active = <0>;
> > +				};
> > +			};
> > +		};
> > +	};
> >  };
> >
> >  &i2c1 {
> > --
> > 2.7.4
> >
>
> --
> Regards,
> Niklas Söderlund

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