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

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Date:   Thu, 18 Oct 2018 14:23:50 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     devicetree@...r.kernel.org, Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        David Airlie <airlied@...ux.ie>, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/9] dt-bindings: Add ANX6345 DP/eDP transmitter binding

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 ? :-)

> >> + - 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>;
> >> +		};
> >> +	};
> >> +};

-- 
Regards,

Laurent Pinchart