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

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Date:	Sun, 27 Oct 2013 21:12:20 +0100
From:	Sebastian Reichel <sre@...ian.org>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	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,
	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-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] wl1251: move power GPIO handling into the driver

On Sun, Oct 27, 2013 at 08:24:16PM +0400, Alexander Shiyan wrote:
> > Move the power GPIO handling from the board code into
> > the driver. This is a dependency for device tree support.
> > 
> > Signed-off-by: Sebastian Reichel <sre@...ian.org>
> > ---
> >  arch/arm/mach-omap2/board-omap3pandora.c     |  2 ++
> >  arch/arm/mach-omap2/board-rx51-peripherals.c | 11 ++--------
> >  drivers/net/wireless/ti/wl1251/sdio.c        | 21 +++++++++++++-----
> >  drivers/net/wireless/ti/wl1251/spi.c         | 33 ++++++++++++++++++----------
> >  drivers/net/wireless/ti/wl1251/wl1251.h      |  2 +-
> >  include/linux/wl12xx.h                       |  2 +-
> >  6 files changed, 43 insertions(+), 28 deletions(-)
> ...
> > diff --git a/include/linux/wl12xx.h b/include/linux/wl12xx.h
> > index b516b4f..a9c723b 100644
> > --- a/include/linux/wl12xx.h
> > +++ b/include/linux/wl12xx.h
> > @@ -49,7 +49,7 @@ enum {
> >  };
> >  
> >  struct wl1251_platform_data {
> > -	void (*set_power)(bool enable);
> > +	int power_gpio;
> >  	/* SDIO only: IRQ number if WLAN_IRQ line is used, 0 for SDIO IRQs */
> >  	int irq;
> >  	bool use_eeprom;
> > -- 
> 
> What a reason for not using regulator API here with GPIO-based
> regulator?

I think this pin is not used as power supply, but like an enable pin
for low power states. Of course the regulator API could still be
(mis?)used for this, but I think it would be the first linux device
driver doing this.

Note: I don't have wl1251 documentation.

-- Sebastian

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