From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Rob Herring <robh@kernel.org>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Jyri Sarha <jsarha@ti.com>, Tomi Valkeinen <tomi.valkeinen@ti.com>,
        David Airlie <airlied@linux.ie>, Kevin Hilman <khilman@baylibre.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Sekhar Nori <nsekhar@ti.com>, Frank Rowand <frowand.list@gmail.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Peter Ujfalusi <peter.ujfalusi@ti.com>,
        Russell King <linux@armlinux.org.uk>,
        LKML <linux-kernel@vger.kernel.org>,
        arm-soc <linux-arm-kernel@lists.infradead.org>,
        linux-drm <dri-devel@lists.freedesktop.org>,
        linux-devicetree <devicetree@vger.kernel.org>
Subject: Re: [PATCH v5 2/4] drm: bridge: add support for TI ths8135
Date: Mon, 12 Dec 2016 18:49:22 +0200
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Hello,

On Monday 12 Dec 2016 10:45:47 Rob Herring wrote:
> On Wed, Dec 07, 2016 at 11:42:43AM +0100, Bartosz Golaszewski wrote:
> > THS8135 is a configurable video DAC. Add DT bindings for this chip and
> > use the dumb-vga-dac driver for now as no configuration is required to
> > make it work.
> > 
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > ---
> > 
> >  .../bindings/display/bridge/ti,ths8135.txt         | 52 +++++++++++++++++
> >  drivers/gpu/drm/bridge/dumb-vga-dac.c              |  1 +
> >  2 files changed, 53 insertions(+)
> >  create mode 100644
> >  Documentation/devicetree/bindings/display/bridge/ti,ths8135.txt
> Acked-by: Rob Herring <robh@kernel.org>
> 
> But one nit below:
> > diff --git
> > a/Documentation/devicetree/bindings/display/bridge/ti,ths8135.txt
> > b/Documentation/devicetree/bindings/display/bridge/ti,ths8135.txt new
> > file mode 100644
> > index 0000000..23cd8ee
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/ti,ths8135.txt
> > @@ -0,0 +1,52 @@
> > +THS8135 Video DAC
> > +-----------------
> > +
> > +This is the binding for Texas Instruments THS8135 Video DAC bridge.
> > +
> > +Required properties:
> > +
> > +- compatible: Must be "ti,ths8135"
> > +
> > +Required nodes:
> > +
> > +This device has two video ports. Their connections are modelled using the
> > OF +graph bindings specified in
> > Documentation/devicetree/bindings/graph.txt. +
> > +- Video port 0 for RGB input
> > +- Video port 1 for VGA output
> > +
> > +Example
> > +-------
> > +
> > +vga-bridge {
> > +	compatible = "ti,ths8135";
> > +	#address-cells = <1>;
> > +	#size-cells = <0>;
> > +
> > +	ports {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		port@0 {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			reg = <0>;
> > +
> > +			vga_bridge_in: endpoint@0 {
> > +				reg = <0>;
> 
> You don't need reg here.

In which case the endpoint node should be named endpoint, not endpoint@0. You 
could then also remove the #address-cells and #size-cells properties from the 
port@0 node. Same for port@1 below.

> > +				remote-endpoint = <&lcdc_out_vga>;
> > +			};
> > +		};
> > +
> > +		port@1 {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			reg = <1>;
> > +
> > +			vga_bridge_out: endpoint@0 {
> > +				reg = <0>;
> > +				remote-endpoint = <&vga_con_in>;
> > +			};
> > +		};
> > +	};
> > +};
> > diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > b/drivers/gpu/drm/bridge/dumb-vga-dac.c index afec232..498fa75 100644
> > --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > @@ -204,6 +204,7 @@ static int dumb_vga_remove(struct platform_device
> > *pdev)
> >  
> >  static const struct of_device_id dumb_vga_match[] = {
> >  	{ .compatible = "dumb-vga-dac" },
> > +	{ .compatible = "ti,ths8135" },
> >  	{},
> >  };
> >  MODULE_DEVICE_TABLE(of, dumb_vga_match);

-- 
Regards,

Laurent Pinchart