linux-kernel - Re: [PATCH 4/9] dt-bindings: Add ANX6345 DP/eDP transmitter binding

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Date:   Thu, 18 Oct 2018 20:40:11 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     devicetree@...r.kernel.org, Archit Taneja <architt@...eaurora.org>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Andrzej Hajda <a.hajda@...sung.com>,
        linux-sunxi@...glegroups.com, Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/9] dt-bindings: Add ANX6345 DP/eDP transmitter binding

在 2018-10-18四的 14:23 +0300，Laurent Pinchart写道：
> Hi Icenowy,
> 
> On Thursday, 18 October 2018 13:00:05 EEST Icenowy Zheng wrote:
> > 在 2018-10-18四的 11:53 +0300，Laurent Pinchart写道：
> > > On Thursday, 18 October 2018 10:33:22 EEST Icenowy Zheng wrote:
> > > > The ANX6345 is an ultra-low power DisplayPort/eDP transmitter
> > > > designed
> > > > for portable devices.
> > > > 
> > > > Add a binding document for it.
> > > > 
> > > > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > > > ---
> > > > 
> > > >  .../bindings/display/bridge/anx6345.txt       | 39
> > > > +++++++++++++++++++
> > > > 
> > > >  1 file changed, 39 insertions(+)
> > > >  create mode 100644
> > > > 
> > > > Documentation/devicetree/bindings/display/bridge/anx6345.txt
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/display/bridge/anx6345.txt
> > > > b/Documentation/devicetree/bindings/display/bridge/anx6345.txt
> > > > new
> > > > file
> > > > mode 100644
> > > > index 000000000000..0689d4eb5f65
> > > > --- /dev/null
> > > > +++
> > > > b/Documentation/devicetree/bindings/display/bridge/anx6345.txt
> > > > @@ -0,0 +1,39 @@
> > > > +Analogix ANX6345 eDP Transmitter
> > > > +--------------------------------
> > > > +
> > > > +The ANX6345 is an ultra-low power Full-HD eDP transmitter
> > > > designed
> > > > for
> > > > +portable devices.
> > > > +
> > > > +Required properties:
> > > > +
> > > > + - compatible		: "analogix,anx6345"
> > > > + - reg			: I2C address of the device
> > > > + - reset-gpios		: Which GPIO to use for reset
> > > > +
> > > > +Optional properties:
> > > > +
> > > > + - dvdd12-supply	: Regulator for 1.2V digital core
> > > > power.
> > > > + - dvdd25-supply	: Regulator for 2.5V digital core
> > > > power.
> > > 
> > > Shouldn't these to supplies be mandatory ?
> > 
> > Yes they should.
> > 
> > > > + - panel-supply		: Regulator for the power of
> > > > the panel.
> > > 
> > > Shouldn't the panel supply for specified in the DT node of the
> > > panel
> > > ?
> > 
> > However, eDP panel can be probed, may vary on the same device, and
> > we
> > don't have a generic binding for it...
> 
> Shouldn't we fix that ? :-)

Maybe we should create a connector binding instead of a panel binding?

> 
> > > > + - edid			: verbatim EDID data block
> > > > describing
> > > > attached
> > > > +			  panel, only used when the panel has
> > > > no EDID
> > > > info.
> > > 
> > > This should also be specified in the panel DT node.
> > > 
> > > > + - Video port for RGB input, using the DT bindings defined in
> > > > [1].
> > > 
> > > I think you should also add a port for the output.
> > 
> > What will it point to?
> 
> The panel DT node ?
> 
> > > > +[1]: Documentation/devicetree/bindings/media/video-
> > > > interfaces.txt
> > > > +
> > > > +Example:
> > > > +
> > > > +anx6345: anx6345@38 {
> > > > +	compatible = "analogix,anx6345";
> > > > +	reg = <0x38>;
> > > > +	reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* PD24 */
> > > > +	panel-supply = <&reg_dc1sw>;
> > > > +	dvdd25-supply = <&reg_dldo2>;
> > > > +	dvdd12-supply = <&reg_fldo1>;
> > > > +
> > > > +	port {
> > > > +		anx6345_in: endpoint {
> > > > +			remote-endpoint = <&tcon0_out_anx6345>;
> > > > +		};
> > > > +	};
> > > > +};
> 
>