linux-kernel - Re: [PATCH 0/3] add power-supply support to dw

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Message-ID: <1425978526.3141.13.camel@pengutronix.de>
Date:	Tue, 10 Mar 2015 10:08:46 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	David Airlie <airlied@...ux.ie>, djkurtz@...omium.org,
	Yakir Yang <ykk@...k-chips.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	dianders@...omium.org, Andy Yan <andy.yan@...k-chips.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	linux-rockchip@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	broonie@...nel.org, devicetree@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/3] add power-supply support to dw_hdmi

Am Dienstag, den 10.03.2015, 00:21 +0100 schrieb Heiko Stuebner:
> At least the Rockchip variant of the dw_hdmi should control its supplying
> regulators. A cursory glance at the imx manual didn't any equivalent there,
> so I'm not sure if there are similar controllable regulators present.

On i.MX6 the HDMI_VP (1.1 V) and HDMI_VPH (2.5 V) are usually supplied
by the internal LDO_SoC via VDD_SOC_CAP (also used for ARM cache, SATA,
and PCIe) and the LDO_2P5 via VDDHIGH_CAP (also used for PLLs, MIPI,
SATA, PCIe, USB, and LVDS), respectively.
While I haven't seen anyone ever do this, it should be possible to
supply them from an external regulator.

regards
Philipp

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