From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Zabel <p.zabel@pengutronix.de>
Subject: Re: [PATCH 3/9] Doc/DT: Add DT binding documentation for DVI Connector
Date: Tue, 11 Mar 2014 12:19:00 +0100
Message-ID: <1394536740.3772.7.camel@paszta.hi.pengutronix.de>
References: <1393590016-9361-1-git-send-email-tomi.valkeinen@ti.com>
	<1393590016-9361-4-git-send-email-tomi.valkeinen@ti.com>
	<20140228155937.GQ21483@n2100.arm.linux.org.uk>
	<1393604717.3802.61.camel@paszta.hi.pengutronix.de>
	<CAL_JsqJ00Zr1tMoyR1+qHUhsNoc6Kj6s+nTZTkNTwki9HFHq8g@mail.gmail.com>
	<531EAF8F.2040400@ti.com>
	<CAMuHMdWqt4M5OEXp8y_DR8UEA8GPxJg99cz-HcmMPQB+h+Rh0A@mail.gmail.com>
	<531EC385.7090001@ti.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <dri-devel-bounces@lists.freedesktop.org>
In-Reply-To: <531EC385.7090001@ti.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/dri-devel>,
	<mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/dri-devel>,
	<mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Sender: dri-devel-bounces@lists.freedesktop.org
Errors-To: dri-devel-bounces@lists.freedesktop.org
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Linux Fbdev development list <linux-fbdev@vger.kernel.org>, Russell King - ARM Linux <linux@arm.linux.org.uk>, DRI Development <dri-devel@lists.freedesktop.org>, Andrzej Hajda <a.hajda@samsung.com>, Rob Herring <robherring2@gmail.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Geert Uytterhoeven <geert@linux-m68k.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
List-Id: devicetree@vger.kernel.org

Am Dienstag, den 11.03.2014, 10:04 +0200 schrieb Tomi Valkeinen:
> On 11/03/14 10:00, Geert Uytterhoeven wrote:
> > On Tue, Mar 11, 2014 at 7:39 AM, Tomi Valkeinen <tomi.valkeinen@ti.com> wrote:
> >> On 10/03/14 23:45, Rob Herring wrote:
> >>> I like this proposal over the others. Although, would dual link be a
> >>
> >> I don't like inferring the information. With the above, you can't find
> >> out that the DVI connector has digital and analog support before all the
> >> drivers are loaded.
> >>
> >>> single endpoint or 2 endpoints? How would you differentiate that?
> >>
> >> Hmm, well endpoints for a single port are exclusive. So it's either a
> >> single port and a single endpoint, or two ports and two endpoints. I
> >> think dual link has to be single port & endpoint, as the TMDS links need
> >> to be driven together as a single bus.
> >>
> >> And dual-link is not really "two links". DVI dual-link means 1 clock
> >> lane and 6 data lanes, compared to 1 clock lane and 3 data lanes for
> >> single-link.
> > 
> > What about having a property for the number of data lanes?
> 
> That was already suggested by Philipp in this thread. I don't see
> anything wrong with that, but I don't really see benefit either.
> "dual-link" is a standard term for 6 data lanes for the DVI connector.
> And the choices are 3 or 6 data lanes, nothing else.

The number of lanes of a DisplayPort connector could be 1 to 4. Also,
there's dual-mode DP which can use four lanes to drive
somewhat-like-HDMI single link TMDS signals.

regards
Philipp