From: <Claudiu.Beznea@microchip.com>
To: <sudeep.holla@arm.com>
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Subject: Re: [PATCH 4/7] dt-bindings: chosen: Add clocksource and clockevent selection
Date: Tue, 10 Sep 2019 14:51:50 +0000 [thread overview]
Message-ID: <ab43b209-78fa-0cab-b8ea-acd4c550e689@microchip.com> (raw)
In-Reply-To: <20190910143231.GB14966@e107533-lin.cambridge.arm.com>
On 10.09.2019 17:32, Sudeep Holla wrote:
> External E-Mail
>
>
> On Tue, Sep 10, 2019 at 04:47:13PM +0300, Claudiu Beznea wrote:
>> From: Alexandre Belloni <alexandre.belloni@bootlin.com>
>>
>> Some timer drivers may behave either as clocksource or clockevent
>> or both. Until now, in case of platforms with multiple hardware
>> resources of the same type, the drivers were chosing the first
>> registered hardware resource as clocksource/clockevent and the
>> next one as clockevent/clocksource. Other were using different
>> compatibles (one for each functionality, although its about the
>> same hardware). Add DT bindings to be able to choose the
>> functionality of a timer.
>>
>
> Is the piece of hardware not capable of serving as both clocksource
> and clockevent or is it just the platform choice ?
In my case, the hardware is not capable of serving at the same time
a clocksource device and a clockevent device.
First, I published v1 for a hardware device having this behavior at
[1] requesting 1st probed hardware device to work as clocksource and
the 2nd one to work as clockevent. The discussion at [1] ended up with
the idea of having a mechanism to specify which hardware device behaves
as clocksource and which one behaves as clockevent.
Thank you,
Claudiu Beznea
[1] https://lore.kernel.org/lkml/1552580772-8499-1-git-send-email-claudiu.beznea@microchip.com/
>
> --
> Regards,
> Sudeep
>
>
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next prev parent reply other threads:[~2019-09-10 14:52 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 13:47 [PATCH 0/7] add support for clocksource/clockevent DT selection Claudiu Beznea
2019-09-10 13:47 ` [PATCH 1/7] clocksource/drivers/c-sky: request timer_of_init only for probing CPU Claudiu Beznea
2019-09-10 13:47 ` [PATCH 2/7] clocksource: change timer registration macros Claudiu Beznea
2019-09-10 14:49 ` Marc Zyngier
2019-09-10 14:57 ` Claudiu.Beznea
2019-09-10 13:47 ` [PATCH 3/7] clocksource/timer_of: use BIT() macro Claudiu Beznea
2019-09-10 13:47 ` [PATCH 4/7] dt-bindings: chosen: Add clocksource and clockevent selection Claudiu Beznea
2019-09-10 14:32 ` Sudeep Holla
2019-09-10 14:51 ` Claudiu.Beznea [this message]
2019-09-10 15:08 ` Sudeep Holla
2019-09-10 15:10 ` Alexandre Belloni
2019-09-11 0:03 ` Linus Walleij
2019-09-11 7:18 ` Claudiu.Beznea
2019-09-12 14:18 ` Linus Walleij
2019-09-30 14:32 ` Rob Herring
2019-10-02 13:32 ` Claudiu.Beznea
2019-09-11 7:34 ` Neil Armstrong
2019-09-11 9:14 ` Alexandre Belloni
2019-09-10 13:47 ` [PATCH 5/7] clocksource/drivers/timer-of: add support support for timer's functionalities Claudiu Beznea
2019-09-10 13:47 ` [PATCH 6/7] drivers/clocksource/timer-of: keep declaration on one line Claudiu Beznea
2019-09-10 13:47 ` [PATCH 7/7] clocksource/drivers/integrator-ap: parse the chosen node Claudiu Beznea
2019-09-10 23:48 ` Linus Walleij
2019-09-11 7:14 ` Claudiu.Beznea
2019-09-10 16:05 ` [PATCH 0/7] add support for clocksource/clockevent DT selection John Stultz
2019-09-11 6:52 ` Claudiu.Beznea
2019-09-11 16:06 ` John Stultz
2019-09-25 17:19 ` Daniel Lezcano
2019-09-26 8:42 ` Claudiu.Beznea
2019-10-02 13:35 ` Claudiu.Beznea
2019-10-03 10:43 ` Claudiu.Beznea
2019-10-13 18:16 ` Daniel Lezcano
2019-10-15 9:23 ` Claudiu.Beznea
2019-10-18 20:24 ` Daniel Lezcano
2019-10-21 8:58 ` Claudiu.Beznea
2019-10-21 14:17 ` Daniel Lezcano
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