linux-kernel - RE: [v2] arm: dts: ls1021a: fix the value of TMR

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Date:   Mon, 18 Dec 2017 02:51:06 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>
Subject: RE: [v2] arm: dts: ls1021a: fix the value of TMR_FIPER1

Hi Shawn,

Sorry for bother. I just couldn’t find this patch on your git tree.
Could you help to check?
Thanks a lot.

Best regards,
Yangbo Lu

> -----Original Message-----
> From: Shawn Guo [mailto:shawnguo@...nel.org]
> Sent: 2017年11月30日 8:29
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; Mark Rutland <mark.rutland@....com>;
> Rob Herring <robh+dt@...nel.org>; Russell King <linux@...linux.org.uk>
> Subject: Re: [v2] arm: dts: ls1021a: fix the value of TMR_FIPER1
> 
> On Wed, Nov 29, 2017 at 02:54:58PM +0800, Yangbo Lu wrote:
> > The timer fixed interval period pulse generator register is used to
> > generate periodic pulses. The down count register loads the value
> > programmed in the fixed period interval (FIPER). At every tick of the
> > timer accumulator overflow, the counter decrements by the value of
> > TMR_CTRL[TCLK_PERIOD]. It generates a pulse when the down counter
> > value reaches zero. It reloads the down counter in the cycle following
> > a pulse. To use the TMR_FIPER1 register to generate a 1 PPS event, the
> > value
> > (10^9 nanoseconds) - TCLK_PERIOD should be programmed.
> > It should be 999999995 not 999999990 since TCLK_PERIOD is 5.
> >
> > Signed-off-by: Yangbo Lu <yangbo.lu@....com>
> 
> 
> Again, for arm dts, we usually use prefix like 'ARM: dts: ...'
> 
> I fixed it up and applied the patch.
> 
> Shawn
> 
> > ---
> > Changes for v2:
> > 	- Added Shawn into cc list.
> > ---
> >  arch/arm/boot/dts/ls1021a.dtsi | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/ls1021a.dtsi
> > b/arch/arm/boot/dts/ls1021a.dtsi index 64249726b3cb..a861a4b9e319
> > 100644
> > --- a/arch/arm/boot/dts/ls1021a.dtsi
> > +++ b/arch/arm/boot/dts/ls1021a.dtsi
> > @@ -589,7 +589,7 @@
> >  			fsl,tclk-period = <5>;
> >  			fsl,tmr-prsc    = <2>;
> >  			fsl,tmr-add     = <0xaaaaaaab>;
> > -			fsl,tmr-fiper1  = <999999990>;
> > +			fsl,tmr-fiper1  = <999999995>;
> >  			fsl,tmr-fiper2  = <99990>;
> >  			fsl,max-adj     = <499999999>;
> >  		};
> > --
> > 2.14.1
> >
> >
> > _______________________________________________
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