From mboxrd@z Thu Jan  1 00:00:00 1970
From: Inki Dae <inki.dae@samsung.com>
Subject: RE: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver
Date: Thu, 10 Oct 2013 13:18:05 +0900
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To: 'Mark Brown' <broonie@kernel.org>
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> -----Original Message-----
> From: Mark Brown [mailto:broonie@kernel.org]
> Sent: Thursday, October 10, 2013 3:29 AM
> To: Inki Dae
> Cc: Olof Johansson; Sean Paul; devicetree@vger.kernel.org; linux-samsung-
> soc@vger.kernel.org; linux-doc@vger.kernel.org; linux-
> kernel@vger.kernel.org; DRI mailing list; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver
> 
> On Fri, Oct 04, 2013 at 11:05:48AM +0900, Inki Dae wrote:
> > 2013/10/4 Olof Johansson <olof@lixom.net>:
> 
> > > "If PD_N is LOW, then the device is in Deep power-down completely,
> > > even if supply rail is ON; for the device to be able to operate, the
> > > PD_N pin must be HIGH."
> 
> > I still think the pin could be replaced with a regulator. But
> > lvds-bridge node has "powerdown-gpio" property - it say this board
> > will use gpio pin - specific to board.  So it seems no problem.
> 
> No, don't model things that aren't regulators as regulators - it's just
> confusing from a usability standpoint and causes breakage when the pins
> don't behave like regulators.

It seems that there was your missing point. That _is not_ what I mentioned.
I mean that other boards can use a regulator instead of gpio pin.