[linux-sunxi] Re: [PATCH v7 4/8] drm/sunxi: Add DT bindings documentation of Allwinner HDMI

[Icenowy Zheng]

30.11.2016, 17:28, "Jean-Francois Moine" <moinejf at free.fr>:
> On Wed, 30 Nov 2016 10:20:21 +0200
> Laurent Pinchart <laurent.pinchart at ideasonboard.com> wrote:
>
>>  > Well, I don't see what this connector can be.
>>  > May you give me a DT example?
>>
>>  Sure.
>>
>>  arch/arm/boot/dts/r8a7791-koelsch.dts
>>
>>          /* HDMI encoder */
>>
>>          hdmi at 39 {
>>                  compatible = "adi,adv7511w";
>>                  reg = <0x39>;
>>                  interrupt-parent = <&gpio3>;
>>                  interrupts = <29 IRQ_TYPE_LEVEL_LOW>;
>>
>>                  adi,input-depth = <8>;
>>                  adi,input-colorspace = "rgb";
>>                  adi,input-clock = "1x";
>>                  adi,input-style = <1>;
>>                  adi,input-justification = "evenly";
>>
>>                  ports {
>>                          #address-cells = <1>;
>>                          #size-cells = <0>;
>>
>>                          port at 0 {
>>                                  reg = <0>;
>>                                  adv7511_in: endpoint {
>>                                          remote-endpoint = <&du_out_rgb>;
>>                                  };
>>                          };
>>
>>                          port at 1 {
>>                                  reg = <1>;
>>                                  adv7511_out: endpoint {
>>                                          remote-endpoint = <&hdmi_con>;
>>                                  };
>>                          };
>>                  };
>>          };
>>
>>          /* HDMI connector */
>>
>>          hdmi-out {
>>                  compatible = "hdmi-connector";
>>                  type = "a";
>>
>>                  port {
>>                          hdmi_con: endpoint {
>>                                  remote-endpoint = <&adv7511_out>;
>>                          };
>>                  };
>>          };
>
> Hi Laurent,
>
> Sorry for I don't see the interest:
> - it is obvious that the HDMI connector is a 'hdmi-connector'!

Yes, it means the wire between the HDMI pins on the SoC and the connector ;-)

> - the physical connector type may be changed on any board by a soldering
>   iron or a connector to connector cable.

I can always alter the devices on a board ;-)

But I should also alter the dt after altering the board.

> - what does the software do with the connector type?
> - why not to put the connector information in the HDMI device?
>
> And, if I follow you, the graph of ports could also be used to describe
> the way the various parts of the SoCs are powered, to describe the pin
> connections, to describe the USB connectors, to describe the board
> internal hubs and bridges...
>
> --
> Ken ar c'hentañ | ** Breizh ha Linux atav! **
> Jef | http://moinejf.free.fr/
>
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