linux-kernel - RE: [PATCH/RFC 04/12] dt-bindings: display: Add bindings for Advantech IDK-2121WR

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Date:   Mon, 5 Aug 2019 09:04:13 +0000
From:   Fabrizio Castro <fabrizio.castro@...renesas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH/RFC 04/12] dt-bindings: display: Add bindings for
 Advantech IDK-2121WR

Hi Laurent,

Thank you for your feedback!

> From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Sent: 02 August 2019 09:04
> Subject: Re: [PATCH/RFC 04/12] dt-bindings: display: Add bindings for Advantech IDK-2121WR
> 
> Hi Fabrizio,
> 
> Thank you for the patch.
> 
> On Fri, Aug 02, 2019 at 08:34:01AM +0100, Fabrizio Castro wrote:
> > This panel is handled through the generic lvds-panel bindings,
> > so only needs its additional compatible specified.
> >
> > Some panel specific documentation can be found here:
> 
> s/panel specific/panel-specific/

Will change

> 
> > https://buy.advantech.eu/Displays/Embedded-LCD-Kits-High-Brightness/model-IDK-2121WR-K2FHA2E.htm
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
> > ---
> >  .../display/panel/advantech,idk-2121wr.txt         | 62 ++++++++++++++++++++++
> >  1 file changed, 62 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.txt
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.txt
> b/Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.txt
> > new file mode 100644
> > index 0000000..70b15b6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.txt
> > @@ -0,0 +1,62 @@
> > +Advantech Co., Ltd. IDK-2121WR 21.5" LVDS panel
> > +===============================================
> > +
> > +Required properties:
> > +- compatible: should be "advantech,idk-2121wr" followed by "panel-lvds"
> > +
> > +This binding is compatible with the lvds-panel binding, which is specified
> > +in panel-lvds.txt in this directory.
> 
> How about adding "The panel operates in dual-link mode and thus requires
> two port nodes." ?

You are right, will add.

> 
> > +
> > +Example
> > +-------
> > +
> > +	panel {
> > +		compatible = "advantech,idk-2121wr", "panel-lvds";
> > +
> > +		width-mm = <476>;
> > +		height-mm = <268>;
> > +
> > +		data-mapping = "vesa-24";
> > +
> > +		panel-timing {
> > +			clock-frequency = <148500000>;
> > +			hactive = <1920>;
> > +			vactive = <1080>;
> > +			hsync-len = <44>;
> > +			hfront-porch = <88>;
> > +			hback-porch = <148>;
> > +			vfront-porch = <4>;
> > +			vback-porch = <36>;
> > +			vsync-len = <5>;
> > +		};
> > +
> > +		ports {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			port@0 {
> > +				reg = <0>;
> > +				lvds0_panel_in: endpoint {
> > +					remote-endpoint = <&lvds0_out>;
> > +				};
> > +			};
> > +
> > +			port@1 {
> > +				reg = <1>;
> > +				lvds1_panel_in: endpoint {
> > +					remote-endpoint = <&lvds1_out>;
> > +				};
> > +			};
> > +		};
> > +	};
> > +
> > +	backlight: backlight {
> > +		compatible = "pwm-backlight";
> > +		pwms = <&pwm5 0 50000>;
> > +
> > +		brightness-levels = <0 4 8 16 32 64 128 255>;
> > +		default-brightness-level = <6>;
> > +
> > +		power-supply = <&reg_12p0v>;
> > +		enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
> > +	};
> 
> I think you can drop the backlight here, it's a bit out of scope.

Agreed.

Thanks,
Fab

> 
> --
> Regards,
> 
> Laurent Pinchart