linux-kernel - RE: [PATCH 09/11] mmc: omap_hsmmc: enhance pinctrl support

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Date:	Tue, 4 Jun 2013 09:52:42 +0000
From:	"Hebbar, Gururaja" <gururaja.hebbar@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Kevin Hilman <khilman@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Bedia, Vaibhav" <vaibhav.bedia@...com>,
	"Rajashekhara, Sudhakar" <sudhakar.raj@...com>,
	"Krishnamoorthy, Balaji T" <balajitk@...com>,
	Chris Ball <cjb@...top.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>
Subject: RE: [PATCH 09/11] mmc: omap_hsmmc: enhance pinctrl support

On Tue, Jun 04, 2013 at 12:49:57, Linus Walleij wrote:
> On Tue, Jun 4, 2013 at 9:11 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Fri, May 31, 2013 at 12:13 PM, Hebbar Gururaja
> > <gururaja.hebbar@...com> wrote:
> >
> >> Amend the hsmmc controller to optionally take a pin control handle and
> >> set the state of the pins to:
> >>
> >> - "default" on boot, resume and before performing a mmc transfer
> >> - "idle" after initial default, after resume default, and after each
> >> mmc/sd card access
> >> - "sleep" on suspend()
> >>
> >> By optionally putting the pins into sleep state in the suspend callback
> >> we can accomplish two things.
> >> - One is to minimize current leakage from pins and thus save power,
> >> - second, we can prevent the IP from driving pins output in an
> >> uncontrolled manner, which may happen if the power domain drops the
> >> domain regulator.
> >>
> >> If any of the above pin states are missing in dt, a warning message
> >> about the missing state is displayed.
> >> If certain pin-states are not available, to remove this warning message
> >> pass respective state name with null phandler.
> >>
> >> Signed-off-by: Hebbar Gururaja <gururaja.hebbar@...com>
> >> Cc: Balaji T K <balajitk@...com>
> >> Cc: Chris Ball <cjb@...top.org>
> >> Cc: linux-mmc@...r.kernel.org
> >> Cc: linux-omap@...r.kernel.org
> >
> > This is perfectly correct.
> > Acked-by: Linus Walleij <linus.walleij@...aro.org>
> 
> So please consider my other option given in patch 2 instead.

I will check how I can be a part of this implementation

> 
> Yours,
> Linus Walleij
> 


Regards, 
Gururaja
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