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

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Message-ID: <20111215093218.GN27267@pengutronix.de>
Date:	Thu, 15 Dec 2011 10:32:18 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Dong Aisheng-B29396 <B29396@...escale.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"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>,
	Guo Shawn-R65073 <r65073@...escale.com>
Subject: Re: [RFC PATCH v2 4/4] mmc: sdhci-esdhc-imx: using pinmux subsystem

On Thu, Dec 15, 2011 at 07:23:42AM +0000, Dong Aisheng-B29396 wrote:
> > -----Original Message-----
> > From: Linus Walleij [mailto:linus.walleij@...aro.org]
> > Sent: Thursday, December 15, 2011 6:16 AM
> > To: Sascha Hauer
> > Cc: 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; Guo Shawn-R65073
> > Subject: Re: [RFC PATCH v2 4/4] mmc: sdhci-esdhc-imx: using pinmux
> > subsystem
> > Importance: High
> > 
> > On Wed, Dec 14, 2011 at 10:11 PM, Sascha Hauer <s.hauer@...gutronix.de>
> > wrote:
> > > On Thu, Dec 15, 2011 at 12:03:42AM +0800, Dong Aisheng wrote:
> > 
> > >> +     pmx = pinmux_get(&pdev->dev, NULL);
> > >> +     if (IS_ERR(pmx)) {
> > >> +             err = PTR_ERR(pmx);
> > >> +             goto err_pmx_get;
> > >> +     }
> > >> +     err = pinmux_enable(pmx);
> > >> +     if (err)
> > >> +             goto err_pmx_enable;
> > >> +     imx_data->pmx = pmx;
> > >> +
> > >
> > > Won't this break every i.MX except i.MX6?
> >
> 
> If not select PINCTRL, pinmux_enable returns ok by default and pinmux_get
> Returns NULL which also does not block.
> So it will not break other i.MX currently since only mx6q are using PINCTRL.
>  
> > Not this patch on its own, first the machines have to select PINCTRL
> > select PINMUX_FOO
> > 
> > *Then* it will break :-D
> > 
> 
> After we move to one single image for mx5 and mx6, it could be an issue
> Since PINCTRL may be selected by default.
> So mx5 pinmux driver is in my TODO list.

Add i.MX3 which is compiled together with i.MX6 :)

Sascha


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