linux-kernel - RE: [PATCH v4 05/11] pwm: pwm-tiecap: pinctrl support

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Date:	Fri, 23 Nov 2012 11:12:15 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
CC:	"paul@...an.com" <paul@...an.com>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"Cousson, Benoit" <b-cousson@...com>,
	"Hiremath, Vaibhav" <hvaibhav@...com>,
	"AnilKumar, Chimata" <anilkumar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"Hebbar, Gururaja" <gururaja.hebbar@...com>,
	"Bedia, Vaibhav" <vaibhav.bedia@...com>
Subject: RE: [PATCH v4 05/11] pwm: pwm-tiecap: pinctrl support

On Fri, Nov 23, 2012 at 16:21:10, Thierry Reding wrote:
> On Fri, Nov 23, 2012 at 10:34:02AM +0000, Philip, Avinash wrote:
> > On Fri, Nov 23, 2012 at 02:29:44, Thierry Reding wrote:
> > > On Wed, Nov 21, 2012 at 06:41:02PM +0530, Philip, Avinash wrote:
> > > [...]
> > > > +	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
> > > > +	if (IS_ERR(pinctrl))
> > > > +		dev_warn(&pdev->dev, "failed to configure pins from driver\n");
> > > 
> > > I think we already discussed this, but shouldn't this be a fatal error?
> > 
> > I had checked relevant discussion and found this can be warning message.
> > This is because most boards don't have pinctrl implemented at this point,
> > or may never have.
> > 
> > https://lkml.org/lkml/2012/9/11/369
> > 
> > Any way I will change to
> > dev_warn(&pdev->dev, "unable to select pin group\n");
> > as in other drivers.
> 
> But in case pinctrl isn't implemented, shouldn't the implementation of
> devm_pinctrl_get_select_default() just be a no-op?

So driver can still exist but pin mux functionality missing. Then warning
message will give hints.
I am also ok with error message & failure of driver with EPROBE_DEFER,
if you want?

Thanks
Avinash

> 
> Thierry
> 

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