From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Subject: Re: Re: [PATCH v7 4/8] drm/sunxi: Add DT bindings
 documentation of Allwinner HDMI
Date: Thu, 1 Dec 2016 09:55:20 +0100
Message-ID: <20161201085520.tk2kdi33rn6fyld2@lukather>
References: <cover.1480414715.git.moinejf@free.fr>
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To: Icenowy Zheng <icenowy-ymACFijhrKM@public.gmane.org>
Cc: "moinejf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <moinejf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>, "dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org" <dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>, Dave Airlie <airlied-cv59FeDIM0c@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org" <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
List-Id: devicetree@vger.kernel.org


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On Thu, Dec 01, 2016 at 01:33:30AM +0800, Icenowy Zheng wrote:
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0hdmi-out {
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0compatible =3D "hdmi-connector";
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0type =3D "a";
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* I2C bus and GPIO references are made up=
 for the example */
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ddc-i2c-bus =3D <&i2c4>;
> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0hpd-gpios =3D <&gpio4 7 GPIO_ACTIVE_HIGH>
> >
> > the "hdmi-connector" is a big piece of software. It must handle a lot
> > of more and more exotic connectors.
> > So, I hope that you have written a "simple-hdmi-connector" which does
> > nothing but setting the connector type.
> > Where is it?
>=20
> I suddenly thought about something...
>=20
> If a DVI connector instead of a HDMI connector is soldered, how
> should such a device tree be written?

Use a dvi-connector instead :)

> How about solder a HDMI-to-VGA bridge on the board? (Maybe there
> should be "dumb-hdmi-dvi-bridge" and "dumb-hdmi-vga-bridge"
> drivers?)

It probably wouldn't be dumb, but yeah, it would definitely be a
bridge instead of the connector.

Maxime

--=20
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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