linux-kernel - Re: [PATCH 2/4] wl1251: move power GPIO handling into the driver

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Message-ID: <20131028192354.GA18208@sirena.org.uk>
Date:	Mon, 28 Oct 2013 12:23:54 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Grazvydas Ignotas <notasas@...il.com>
Cc:	Alexander Shiyan <shc_work@...l.ru>,
	Luciano Coelho <luca@...lho.fi>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-doc@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Bill Pemberton <wfp5p@...ginia.edu>,
	Felipe Balbi <balbi@...com>, Rob Landley <rob@...dley.net>,
	netdev@...r.kernel.org,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] wl1251: move power GPIO handling into the driver

On Mon, Oct 28, 2013 at 07:29:52PM +0200, Grazvydas Ignotas wrote:

> When wl12xx family of chips is connected through SDIO, we already have
> that pin set up as a regulator controlled with the help of mmc
> subsystem. When time comes to communicate with the chip, mmc subsystem
> sees this as yet another SD card and looks for associated regulator
> for it, and the board file has that set up as a fixed regulator
> controlling that pin (see pandora_vmmc3 in
> arch/arm/mach-omap2/board-omap3pandora.c). To prevent poweroff after
> first SDIO communications are over, pm_runtime calls are used in
> drivers/net/wireless/ti/wl1251/sdio.c .

Is this actually controlling VMMC though, or is it some other control?
If it's not controlling VMMC then it shouldn't say that it is.

> I don't know if something similar can be done done in SPI case, but
> I'm sure this is not the first your-so-called regulator misuse.

It's not the first but that doesn't make controlling something other
than a regulator through the regulator API any less broken.

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