linux-kernel - Re: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver

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Message-ID: <20131009182905.GY21581@sirena.org.uk>
Date:	Wed, 9 Oct 2013 19:29:05 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Inki Dae <inki.dae@...sung.com>
Cc:	Olof Johansson <olof@...om.net>, Sean Paul <seanpaul@...omium.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.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@...om.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.

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