linux-kernel - Re: [PATCH v2 05/12] mmc: pwrseq: Document optional exteral vcc for the simple power sequence

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Date:	Fri, 8 Jan 2016 09:13:39 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Caesar Wang <wxt@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	linux-rockchip@...ts.infradead.org, leecam@...gle.com,
	leozwang@...gle.com, keescook@...gle.com,
	devicetree@...r.kernel.org, Andreas Fenkart <afenkart@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 05/12] mmc: pwrseq: Document optional exteral vcc for
 the simple power sequence

Hello Caesar,

On 01/07/2016 05:25 AM, Caesar Wang wrote:
> This patch adds the exteral vcc optional for the simple power sequence.
> 
> Some WLAN chips attached to a SDIO interface, need an external vcc
> to be operational. Since this is very common, extend the simple MMC
> power sequence DT binding to support an optional exteral vcc.
> 

s/exteral/external in the subject line and other places.

I think that makes sense to extend the simple power sequence provider
to add a regulator since many SDIO chips may needed it but it seems
from the commit message of patch 06/12 that you don't actually need
a regulator but to toggle a WL_REG_ON pin in your WiFi chip.

I'll answer to that patch though.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America