linux-kernel - Re: [PATCH v3 1/5] dt-bindings: display: bridge: fork out ti,ds90c185 from lvds-transmitter

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Message-ID: <20190122205345.GF3264@pendragon.ideasonboard.com>
Date:   Tue, 22 Jan 2019 22:53:45 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Peter Rosin <peda@...ntia.se>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: display: bridge: fork out
 ti,ds90c185 from lvds-transmitter

Hello,

On Fri, Jan 11, 2019 at 08:49:04AM -0600, Rob Herring wrote:
> On Sat, Dec 29, 2018 at 07:07:19AM +0000, Peter Rosin wrote:
> > DS90C185 has a shutdown pin which does not fit in the lvds-transmitter
> > binding, which is meant to be generic.
> > 
> > The sister chip DS90C187 is similar to DS90C185, describe it here as well.
> > 
> > Signed-off-by: Peter Rosin <peda@...ntia.se>
> > ---
> >  .../bindings/display/bridge/lvds-transmitter.txt   |  8 +---
> >  .../bindings/display/bridge/ti,ds90c185.txt        | 55 ++++++++++++++++++++++
> >  2 files changed, 56 insertions(+), 7 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
> > index 50220190c203..fd39ad34c383 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
> > +++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
> > @@ -22,13 +22,7 @@ among others.
> >  
> >  Required properties:
> >  
> > -- compatible: Must be one or more of the following
> > -  - "ti,ds90c185" for the TI DS90C185 FPD-Link Serializer
> > -  - "lvds-encoder" for a generic LVDS encoder device
> > -
> > -  When compatible with the generic version, nodes must list the
> > -  device-specific version corresponding to the device first
> > -  followed by the generic version.
> 
> I think you should keep something here. I'd reword it to say any encoder 
> with additional properties must have a device specific compatible in 
> addition.

I was going to mention this too. Maybe

- compatible: Shall contain a device-specific compatible string follow
  by "lvds-encoder".

That's stronger than Rob's suggestion, as I don't think we should allow
omitting the device-specific compatible string in any case to make sure
we can preserve backward compatibility in the future.

> > +- compatible: Must be "lvds-encoder"
> >  
> >  Required nodes:
> >  
> > diff --git a/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt
> > new file mode 100644
> > index 000000000000..e575f996959a
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt
> > @@ -0,0 +1,55 @@
> > +Texas Instruments FPD-Link (LVDS) Serializer
> > +--------------------------------------------
> > +
> > +The DS90C185 and DS90C187 are low-power serializers for portable
> > +battery-powered applications that reduces the size of the RGB
> > +interface between the host GPU and the display.
> > +
> > +Required properties:
> > +
> > +- compatible: Should be
> > +  "ti,ds90c185", "lvds-encoder"  for the TI DS90C185 FPD-Link Serializer
> > +  "ti,ds90c187", "lvds-encoder"  for the TI DS90C187 FPD-Link Serializer

s/  for/ for/

With these fixed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> > +
> > +Optional properties:
> > +
> > +- powerdown-gpios: Power down control GPIO (the PDB pin, active-low)
> > +
> > +Required nodes:
> > +
> > +The devices have two video ports. Their connections are modeled using the OF
> > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > +
> > +- Video port 0 for parallel input
> > +- Video port 1 for LVDS output
> > +
> > +
> > +Example
> > +-------
> > +
> > +lvds-encoder {
> > +	compatible = "ti,ds90c185", "lvds-encoder";
> > +
> > +	powerdown-gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
> > +
> > +	ports {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		port@0 {
> > +			reg = <0>;
> > +
> > +			lvds_enc_in: endpoint {
> > +				remote-endpoint = <&lcdc_out_rgb>;
> > +			};
> > +		};
> > +
> > +		port@1 {
> > +			reg = <1>;
> > +
> > +			lvds_enc_out: endpoint {
> > +				remote-endpoint = <&lvds_panel_in>;
> > +			};
> > +		};
> > +	};
> > +};

-- 
Regards,

Laurent Pinchart