RE: [PATCH] arm64: dts: renesas: r8a7796: Add CMT device nodes

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Hi Simon,

Thanks for the feedback.

> -----Original Message-----
> From: Simon Horman <horms@xxxxxxxxxxxx>
> Sent: 21 November 2018 10:24
> To: Biju Das <biju.das@xxxxxxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>; Mark Rutland
> <mark.rutland@xxxxxxx>; Magnus Damm <magnus.damm@xxxxxxxxx>;
> linux-renesas-soc@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Geert
> Uytterhoeven <geert+renesas@xxxxxxxxx>; Chris Paterson
> <Chris.Paterson2@xxxxxxxxxxx>; Daniel Lezcano
> <daniel.lezcano@xxxxxxxxxx>; Thomas Gleixner <tglx@xxxxxxxxxxxxx>; John
> Stultz <john.stultz@xxxxxxxxxx>; Fabrizio Castro
> <fabrizio.castro@xxxxxxxxxxxxxx>
> Subject: Re: [PATCH] arm64: dts: renesas: r8a7796: Add CMT device nodes
>
> On Fri, Oct 26, 2018 at 09:25:07AM +0100, Biju Das wrote:
> > This patch adds CMT{0|1|2|3} device nodes for r8a7796 SoC.
> >
> > Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
> > ---
> > This patch is tested against renesas-dev
> >
> > I have executed on inconsistency-check, nanosleep and
> > clocksource_switch selftests on this arm64 SoC. The
> > inconsistency-check and nanosleep tests are working fine.The
> > clocksource_switch asynchronous test is failing due to inconsistency-check
> failure on "arch_sys_counter".
> >
> > But if i skip the clocksource_switching of "arch_sys_counter", the
> > asynchronous test is passing for CMT0/1/2/3 timer.
> >
> > Has any one noticed this issue?
>
> I am reluctant to apply this patch until there is a better understanding of the
> issue above.

If I understand correctly this patch has no issue at all. The problem is related to ARM architecture  timer.
Please correct me if you think otherwise.

Regards,
Biju



Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.




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