linux-kernel - Re: [RFC PATCH v2 4/4] mmc: sdhci-esdhc-imx: using pinmux subsystem

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Message-ID: <20111215093319.GO27267@pengutronix.de>
Date:	Thu, 15 Dec 2011 10:33:19 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Dong Aisheng-B29396 <B29396@...escale.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Guo Shawn-R65073 <r65073@...escale.com>,
	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [RFC PATCH v2 4/4] mmc: sdhci-esdhc-imx: using pinmux subsystem

On Thu, Dec 15, 2011 at 08:59:28AM +0000, Dong Aisheng-B29396 wrote:
> > -----Original Message-----
> > From: Linus Walleij [mailto:linus.walleij@...aro.org]
> > Sent: Thursday, December 15, 2011 4:27 PM
> > To: Guo Shawn-R65073
> > Cc: Sascha Hauer; Dong Aisheng-B29396; linus.walleij@...ricsson.com;
> > linux-kernel@...r.kernel.org; rob.herring@...xeda.com;
> > grant.likely@...retlab.ca; linux-arm-kernel@...ts.infradead.org;
> > kernel@...gutronix.de
> > Subject: Re: [RFC PATCH v2 4/4] mmc: sdhci-esdhc-imx: using pinmux
> > subsystem
> > Importance: High
> > 
> > On Thu, Dec 15, 2011 at 8:05 AM, Shawn Guo <shawn.guo@...escale.com>
> > wrote:
> > >[Me]
> > >> So if you want to do this for i.MX you need something like selectable
> > >> dummy pinmuxes, i.e. pinmux_get() to return something that just say
> > >> "OK" to everything like the dummy regulators.
> > >>
> > >> Shall I try to create something like that?
> > >>
> > > Isn't the empty functions defined in include/linux/pinctrl/pinmux.h
> > > for this purpose?
> > 
> > No, these are for compiling it *out*, dummy pinmuxes would be if you
> > compile it *in*, but don't find an apropriate pinmux, you still get
> > something that does nothing and still works.
> > 
> > Dummy regulators work exactly this way.
> > 
> 
> I did not read the dummy regulator code too much.
> But does it mean that the dummy regulator or dummy pinmux will also hide the
> Real errors since it will always get a available one?
> How do we distinguish between the two case(real error and fake error)?

We don't :(

That's the problem with the dummy regulator.

Sascha

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