linux-kernel - Re: [PATCH v2 2/2] clocksource/drivers/mtk_systimer: Add support for Mediatek SoCs

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Message-ID: <e8a7e390-789c-5c91-a9db-535adf0d7d4a@linaro.org>
Date:   Wed, 27 Jun 2018 11:59:55 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 2/2] clocksource/drivers/mtk_systimer: Add support for
 Mediatek SoCs

On 27/06/2018 11:50, Stanley Chu wrote:
> 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

Obviously :)



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