linux-kernel - Re: [PATCH v2] powerpc/dts: Add and fix 1588 timer node for eTSEC

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Date:	Thu, 16 Jul 2015 15:38:32 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Lu Yangbo-B47093 <yangbo.lu@...escale.com>
CC:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] powerpc/dts: Add and fix 1588 timer node for eTSEC

On Wed, 2015-07-15 at 21:37 -0500, Lu Yangbo-B47093 wrote:
> Any comments?
> Thanks.

Sorry, I must have missed this on my last time through the patch queue.  I 
see you've decimalized the fiper and max-adj properties, which is good... but 
does it really make sense for tmr-add?  I'm not familiar with what this value 
represents, but the numbers look more natural as hex (e.g. 0xaaaaaaab versus 
2863311531).

> > diff --git a/arch/powerpc/boot/dts/p2020rdb-pc.dtsi
> > b/arch/powerpc/boot/dts/p2020rdb-pc.dtsi
> > index c21d1c7..363172d 100644
> > --- a/arch/powerpc/boot/dts/p2020rdb-pc.dtsi
> > +++ b/arch/powerpc/boot/dts/p2020rdb-pc.dtsi
> > @@ -215,12 +215,12 @@
> >     };
> > 
> >      ptp_clock@...00{
> > -           fsl,tclk-period = <5>;
> > -           fsl,tmr-prsc = <200>;
> > -           fsl,tmr-add = <0xCCCCCCCD>;
> > -           fsl,tmr-fiper1 = <0x3B9AC9FB>;
> > -           fsl,tmr-fiper2 = <0x0001869B>;
> > -           fsl,max-adj = <249999999>;
> > +           fsl,tclk-period = <5>;
> > +           fsl,tmr-prsc    = <2>;
> > +           fsl,tmr-add     = <2863311531>;
> > +           fsl,tmr-fiper1  = <999999995>;
> > +           fsl,tmr-fiper2  = <99990>;
> > +           fsl,max-adj     = <299999999>;
> >     };

And here, you're changing the value of fsl,tmr-add and fsl,max-adj.  Why?

-Scott

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