Re: [PATCH v3 1/2] drm/bridge: dw-hdmi: support optional supply regulators

From: "Heiko Stübner" <heiko@sntech.de>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Pawel Moll <pawel.moll@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	dianders@chromium.org, linux-rockchip@lists.infradead.org,
	dri-devel@lists.freedesktop.org, Yakir Yang <ykk@rock-chips.com>,
	Andy Yan <andy.yan@rock-chips.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 1/2] drm/bridge: dw-hdmi: support optional supply regulators
Date: Fri, 12 Jun 2015 09:27:07 +0200	[thread overview]
Message-ID: <4099644.agHN3RgGum@diego> (raw)
In-Reply-To: <20150609233618.GK7557@n2100.arm.linux.org.uk>

Am Mittwoch, 10. Juni 2015, 00:36:18 schrieb Russell King - ARM Linux:
> On Wed, Jun 10, 2015 at 01:29:43AM +0200, Heiko Stübner wrote:
> > Allthough from the discussion and explanations I've now also got the
> > "don't
> > make it worse" feeling, so am somehow reluctant to add supplies that also
> > might describe this inadequately.
> > 
> > The Rockchip-specific documentation only lists the two supplies as
> > AVDD_1V0, AVDD_1V8 with a description of "DC supply voltage for Analog
> > part of HDMI". The supplies aren't mentioned otherwise at all, so I guess
> > I'll ponder this a bit more at first.
> 
> Are they controllable from software at all?  If they aren't, then
> I'd suggest leaving them out until we have a distinction between
> the Tx and Phy - much as we do for iMX6.

they are supplied by the pmic the system uses (named vdd10_lcd and vdd18_lcd 
in the soc manuals/schematics)  and supply the individual output encoder 
analog parts (hdmi, edp, lvds, etc).  So if there is no output at all, they 
should be able to be turned off.
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