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From: Stanley Chu <stanley.chu@mediatek.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Rob Herring <robh+dt@kernel.org>,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
	devicetree@vger.kernel.org, wsd_upstream@mediatek.com
Subject: Re: [PATCH v2 2/2] clocksource/drivers/mtk_systimer: Add support for Mediatek SoCs
Date: Wed, 27 Jun 2018 17:50:16 +0800	[thread overview]
Message-ID: <1530093016.17448.35.camel@mtkswgap22> (raw)
In-Reply-To: <2a40ec95-7352-f0c4-b394-d7b689de98ec@linaro.org>

On Wed, 2018-06-27 at 11:39 +0200, Daniel Lezcano wrote:
> On 27/06/2018 09:53, Stanley Chu wrote:
> > This patch adds a new clock event for the timer
> > found on the Mediatek SoCs.
> > 
> > The Mediatek System Timer has several 32-bit timers.
> > Only one timer is used by this driver as a clock event
> > supporting oneshot events.
> > 
> > The System Timer can be run with two clocks. A 13 MHz system
> > clock and the RTC clock running at 32 KHz. This implementation
> > uses the system clock with no clock source divider.
> 
> Recent platforms have the arch_arm_timer and it will be always selected.
> 
> What is the benefit of adding this timer ?
> 
> 
Hi Daniel,

To save power as much as possible, our platform enables
"arch_timer_c3stop" in arch_arm_timer, and thus another always-on timer
is required for tick-broadcasting. System Timer is introduced for above
purpose.

Thanks.
Stanley Chu

  reply	other threads:[~2018-06-27  9:50 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-27  7:53 [PATCH v2 0/2] Add system timer driver for Mediatek SoCs Stanley Chu
     [not found] ` <1530086039-3763-1-git-send-email-stanley.chu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2018-06-27  7:53   ` [PATCH v2 1/2] dt-bindings: Add mtk-systimer bindings Stanley Chu
2018-06-27  8:20     ` Daniel Lezcano
2018-06-28 10:24       ` Stanley Chu
2018-06-27  7:53 ` [PATCH v2 2/2] clocksource/drivers/mtk_systimer: Add support for Mediatek SoCs Stanley Chu
2018-06-27  9:39   ` Daniel Lezcano
2018-06-27  9:50     ` Stanley Chu [this message]
2018-06-27  9:59       ` Daniel Lezcano
2018-06-27 10:01   ` Daniel Lezcano
2018-06-28 10:32     ` Stanley Chu

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