linux-kernel - RE: [PATCH 4/4] Documentation: Add device tree bindings for Freescale FTM PWM

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Date:	Mon, 2 Sep 2013 02:18:19 +0000
From:	Xiubo Li-B47053 <B47053@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	Guo Shawn-R65073 <r65073@...escale.com>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"rob@...dley.net" <rob@...dley.net>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH 4/4] Documentation: Add device tree bindings for
 Freescale FTM PWM

> Subject: Re: [PATCH 4/4] Documentation: Add device tree bindings for
> Freescale FTM PWM
> 
> Should have at least something w/regards to a commit message.
> 

I have sent a V2 patch and have added it.


> > +  used to encode the polarity of PWM output. Set bit 0 of the third
> > +in PWM
> > +  specifier to 1 for inverse polarity & set to 0 for normal polarity.
> > +- fsl,pwm-clk-ps: the ftm0 pwm clock's prescaler, divide-by 2^n(n = 0
> ~ 7).
> > +- fsl,pwm-cpwm: Center-Aligned PWM (CPWM) mode.
> 
> Should describe this in more detail, what does the value actually mean
> for what modes there are?
> 

It's maybe a very useful feature for FTM core, but for PWM is not.
This isn't needed any more for PWM, and in V2 patch I have removed CPWM mode.

> > +- fsl,pwm-number: the number of PWM devices, and is must equal to the
> > +number
> > +  of "fsl,pwm-channels".
> 
> If they must be equal why do we need both?
> 

I have replaced both of them too in V2.

> > +- fsl,pwm-channels: the channels' order which is be used for pwm in
> > +ftm0
> > +  module, and they must be one or some of 0 ~ 7, because the ftm0
> > +only has
> > +  8 channels can be used.
> > +- for very channel, the revlatived the pinctrl should be at least two
> > +state
> 
> revlatived?
> 

This too.

--
Best Regards.
Xiubo


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