linux-kernel - Re: [PATCH] mxcmmc: Add the ability to bind a regulator to manage the MMC card voltage

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Date:	Tue, 02 Nov 2010 11:33:36 +0100
From:	Alberto Panizzo <maramaopercheseimorto@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Daniel Mack <daniel@...aq.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Eric Bénard <eric@...rea.com>,
	Fabio Estevam <fabioestevam@...oo.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH] mxcmmc: Add the ability to bind a regulator to manage
 the MMC card voltage

On mar, 2010-11-02 at 08:39 +0100, Sascha Hauer wrote:
> On Tue, Nov 02, 2010 at 01:05:37AM +0100, Alberto Panizzo wrote:
> > This implementation is based on the pxamci.c driver and it will
> > be used to support the mx31_3ds machine.
> > 
> > Signed-off-by: Alberto Panizzo <maramaopercheseimorto@...il.com>
> 
> Looks good to me
> 
> Acked-by: Sascha Hauer <s.hauer@...gutronix.de>

Tks Sascha, the only difference between the pxa implementations is in 
this part:

> > +static inline void mxcmci_set_power(struct mxcmci_host *host, unsigned int vdd)
> > +{
> > +#ifdef CONFIG_REGULATOR
> > +	if (host->vcc)
> > +		mmc_regulator_set_ocr(host->vcc, vdd);
> > +#endif
> > +	if (host->pdata && host->pdata->setpower)
> > +		host->pdata->setpower(mmc_dev(host->mmc), vdd);
> > +}
> > +

The original one have this test:
	if (!host->vcc && host->pdata && host->pdata->setpower)
		host->pdata->setpower(mmc_dev(host->mmc), vdd);

But removing it, we are able to add further action than only powering
with the right voltage the mmc card.
In the case of the mx31_3ds we are able to enable the external hardware 
buffer only when it is really needed.

-- 
Alberto!

        Be Persistent!
                - Greg Kroah-Hartman (FOSDEM 2010)

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