linux-kernel - Re: [PATCH v6 1/3] dt-bindings: display: bridge: Document THC63LVD1024 LVDS decoder

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Message-ID: <20180326222249.tvjiutyd4amlibpa@rob-hp-laptop>
Date:   Mon, 26 Mar 2018 17:22:49 -0500
From:   Rob Herring <robh@...nel.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>, architt@...eaurora.org,
        a.hajda@...sung.com, airlied@...ux.ie, horms@...ge.net.au,
        magnus.damm@...il.com, geert@...ux-m68k.org,
        niklas.soderlund@...natech.se, sergei.shtylyov@...entembedded.com,
        mark.rutland@....com, dri-devel@...ts.freedesktop.org,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/3] dt-bindings: display: bridge: Document
 THC63LVD1024 LVDS decoder

On Tue, Mar 20, 2018 at 02:43:33PM +0200, Laurent Pinchart wrote:
> Hi Jacopo,
> 
> (CC'ing Rob)
> 
> Thank you for the patch.
> 
> On Friday, 16 March 2018 17:16:37 EET Jacopo Mondi wrote:
> > Document Thine THC63LVD1024 LVDS decoder device tree bindings.
> > 
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
> > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> > ---
> >  .../bindings/display/bridge/thine,thc63lvd1024.txt | 66 +++++++++++++++++++
> >  1 file changed, 66 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > new file mode 100644
> > index 0000000..8225c6a
> > --- /dev/null
> > +++
> > b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > @@ -0,0 +1,66 @@
> > +Thine Electronics THC63LVD1024 LVDS decoder
> > +-------------------------------------------
> > +
> > +The THC63LVD1024 is a dual link LVDS receiver designed to convert LVDS
> > streams
> > +to parallel data outputs. The chip supports single/dual input/output modes,
> > +handling up to two two input LVDS stream and up to two digital CMOS/TTL
> > outputs.
> > +
> > +Single or dual operation modes, output data mapping and DDR output modes
> > are
> > +configured through input signals and the chip does not expose any control
> > bus.
> > +
> > +Required properties:
> > +- compatible: Shall be "thine,thc63lvd1024"
> > +
> > +Optional properties:
> > +- vcc-supply: Power supply for TTL output and digital circuitry
> > +- cvcc-supply: Power supply for TTL CLOCKOUT signal
> > +- lvcc-supply: Power supply for LVDS inputs
> > +- pvcc-supply: Power supply for PLL circuitry
> 
> As explained in a comment to one of the previous versions of this series, I'm 
> tempted to make vcc-supply mandatory and drop the three other power supplies 
> for now, as I believe there's very little chance they will be connected to 
> separately controllable regulators (all supplies use the same voltage). In the 
> very unlikely event that this occurs in design we need to support in the 
> future, the cvcc, lvcc and pvcc supplies can be added later as optional 
> without breaking backward compatibility.

I'm okay with that.

> Apart from that,
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> > +- pdwn-gpios: Power down GPIO signal. Active low

powerdown-gpios is the semi-standard name.

> > +- oe-gpios: Output enable GPIO signal. Active high
> > +
> > +The THC63LVD1024 video port connections are modeled according
> > +to OF graph bindings specified by
> > Documentation/devicetree/bindings/graph.txt
> > +
> > +Required video port nodes:
> > +- Port@0: First LVDS input port
> > +- Port@2: First digital CMOS/TTL parallel output

s/Port/port/

> > +
> > +Optional video port nodes:
> > +- Port@1: Second LVDS input port
> > +- Port@3: Second digital CMOS/TTL parallel output
> > +
> > +Example:
> > +--------
> > +
> > +	thc63lvd1024: lvds-decoder {
> > +		compatible = "thine,thc63lvd1024";
> > +
> > +		vcc-supply = <&reg_lvds_vcc>;
> > +		lvcc-supply = <&reg_lvds_lvcc>;
> > +
> > +		pdwn-gpio = <&gpio4 15 GPIO_ACTIVE_LOW>;
> > +
> > +		ports {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			port@0 {
> > +				reg = <0>;
> > +
> > +				lvds_dec_in_0: endpoint {
> > +					remote-endpoint = <&lvds_out>;
> > +				};
> > +			};
> > +
> > +			port@2{
> > +				reg = <2>;
> > +
> > +				lvds_dec_out_2: endpoint {
> > +					remote-endpoint = <&adv7511_in>;
> > +				};
> > +
> > +			};
> > +
> > +		};
> > +	};
> 
> -- 
> Regards,
> 
> Laurent Pinchart
>