linux-kernel - Re: [PATCH] PWM: Add support for configuring polarity of PWM

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Message-ID: <20120723195249.GA7526@avionic-0098.mockup.avionic-design.de>
Date:	Mon, 23 Jul 2012 21:52:49 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	"Philip, Avinash" <avinashphilip@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"Hebbar, Gururaja" <gururaja.hebbar@...com>
Subject: Re: [PATCH] PWM: Add support for configuring polarity of PWM

On Mon, Jul 23, 2012 at 03:05:26PM +0000, Philip, Avinash wrote:
> On Mon, Jul 23, 2012 at 18:38:25, Thierry Reding wrote:
> > On Mon, Jul 23, 2012 at 12:51:11PM +0000, Philip, Avinash wrote:
> > > On Mon, Jul 23, 2012 at 14:00:32, Thierry Reding wrote:
> > > > On Wed, Jul 18, 2012 at 06:24:13PM +0530, Philip, Avinash wrote:
> > > > >  /*
> > > > >   * pwm_enable - start a PWM output toggling
> > > > >   */
> > > > > @@ -37,6 +47,7 @@ struct pwm_chip;
> > > > >  enum {
> > > > >  	PWMF_REQUESTED = 1 << 0,
> > > > >  	PWMF_ENABLED = 1 << 1,
> > > > > +	PWMF_POLARITY_INVERSE = 1 << 2,
> > > > 
> > > > This should be named PWMF_POLARITY_INVERSED for consistency.
> > > 
> > > Ok I will correct it.
> > > 
> > > > I'm not sure that we really need this flag, though. It isn't used anywhere. But
> > > > maybe you have a use-case in mind?
> > > 
> > > It can be used to find the polarity of the PWM at runtime.
> > 
> > Yes, but is there any use-case where this information would be required?
> 
> It's been added as a feature enhancement. May be it can ignore?

I think it can be removed for now. It can be added back if we ever
really need it.

Thierry

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