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

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Message-ID: <6943843.2osudLfTFd@avalon>
Date:   Mon, 21 May 2018 13:54:55 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     jacopo mondi <jacopo@...ndi.org>
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 Jacopo,

On Monday, 21 May 2018 12:57:05 EEST jacopo mondi wrote:
> On Fri, May 18, 2018 at 06:12:15PM +0300, Laurent Pinchart wrote:
> > 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.

Indeed, my bad.

Shouldn't you however use "adi,adv7180cp" as that's the chip we are using ? 
The "adi,adv7180" has no port documented in its DT bindings, so it shouldn't 
have any port node at all.

> >> +			/*
> >> +			 * 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