linux-kernel - Re: [PATCH v3 2/3] arm64: dts: renesas: draak: Describe CVBS input

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Date:   Mon, 21 May 2018 11:57:05 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        niklas.soderlund@...natech.se, 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 v3 2/3] arm64: dts: renesas: draak: Describe CVBS input

Hi Laurent,

On Fri, May 18, 2018 at 06:12:15PM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Friday, 18 May 2018 17:47:57 EEST Jacopo Mondi wrote:
> > Describe CVBS video input through analog video decoder ADV7180
> > connected to video input interface VIN4.
> >
> > The video input signal path is shared with HDMI video input, and
> > selected by on-board switches SW-53 and SW-54 with CVBS input selected
> > by the default switches configuration.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> >
> > ---
> > v2 -> v3:
> > - Add comment to describe the shared input video path
> > - Add my SoB and Niklas' R-b tags
> > ---
> >  arch/arm64/boot/dts/renesas/r8a77995-draak.dts | 42 +++++++++++++++++++++++
> >  1 file changed, 42 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts index 9d73de8..95745fc
> > 100644
> > --- a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > +++ b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > @@ -142,6 +142,11 @@
> >  		groups = "usb0";
> >  		function = "usb0";
> >  	};
> > +
> > +	vin4_pins_cvbs: vin4 {
> > +		groups = "vin4_data8", "vin4_sync", "vin4_clk";
> > +		function = "vin4";
> > +	};
> >  };
> >
> >  &i2c0 {
> > @@ -154,6 +159,23 @@
> >  		reg = <0x50>;
> >  		pagesize = <8>;
> >  	};
> > +
> > +	analog-video@20 {
> > +		compatible = "adi,adv7180";
> > +		reg = <0x20>;
> > +
> > +		port {
>
> The adv7180 DT bindings document the output port as 3 or 6 (respectively for
> the CP and ST versions of the chip). You should thus number the port. Apart
> from that the patch looks good.

I admit I have barely copied this from Gen-2 boards DTS, but reading
the driver code and binding description again, I think this is
correct, as the output port numbering and mandatory input port (which
is missing here) only apply to adv7180cp/st chip versions.

Here we describe plain adv7180, no need to number output ports afaict.

Thanks
  j

>
> > +			/*
> > +			 * The VIN4 video input path is shared between
> > +			 * CVBS and HDMI inputs through SW[49-54] switches.
> > +			 *
> > +			 * CVBS is the default selection, link it to VIN4 here.
> > +			 */
> > +			adv7180_out: endpoint {
> > +				remote-endpoint = <&vin4_in>;
> > +			};
> > +		};
> > +	};
> >  };
> >
> >  &i2c1 {
> > @@ -246,3 +268,23 @@
> >  	timeout-sec = <60>;
> >  	status = "okay";
> >  };
> > +
> > +&vin4 {
> > +	pinctrl-0 = <&vin4_pins_cvbs>;
> > +	pinctrl-names = "default";
> > +
> > +	status = "okay";
> > +
> > +	ports {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		port@0 {
> > +			reg = <0>;
> > +
> > +			vin4_in: endpoint {
> > +				remote-endpoint = <&adv7180_out>;
> > +			};
> > +		};
> > +	};
> > +};
>
> --
> Regards,
>
> Laurent Pinchart
>
>
>

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