linux-kernel - Re: [PATCH] ARM: dts: stm32: Enable high resolution timer

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Message-ID: <20190927125912.GB8704@bogus>
Date:   Fri, 27 Sep 2019 13:59:12 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Benjamin GAIGNARD <benjamin.gaignard@...com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: stm32: Enable high resolution timer

On Fri, Sep 27, 2019 at 12:44:55PM +0000, Benjamin GAIGNARD wrote:

[...]
>
> Even in low-power modes this timer is always powered and clocked so it
> is working fine.
>

Is that tested ? I see only cpu_{on,off} available on this platform with
PSCI v0.1. Did you add cpu_suspend, idle-states and then gave it a spin ?
Or do you have some other idle driver with which this is tested ?

Also I don't understand how "always-on" is linked to hrtimer. Always on
timers are just selected to be broadcast timer without sacrificing(simply
keeping) a cpu to be always active for broadcast purposes.

--
Regards,
Sudeep