linux-kernel - Re: [PATCH v3 2/2] clocksource: sprd: Add timer driver for Spreadtrum SC9860 platform

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Date:   Tue, 12 Dec 2017 10:16:32 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Baolin Wang <baolin.wang@...eadtrum.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v3 2/2] clocksource: sprd: Add timer driver for Spreadtrum
 SC9860 platform


Hi Baolin,


On 08/12/2017 09:20, Baolin Wang wrote:

[ ... ]

>>> +static irqreturn_t sprd_timer_interrupt(int irq, void *dev_id)
>>> +{
>>> +     struct clock_event_device *ce = (struct clock_event_device *)dev_id;
>>> +     struct timer_of *to = to_timer_of(ce);
>>> +
>>> +     sprd_timer_clear_interrupt(timer_of_base(to));
>>> +
>>> +     if (clockevent_state_oneshot(ce))
>>> +             sprd_timer_disable(timer_of_base(to));
>>> +
>>> +     ce->event_handler(ce);
>>> +     return IRQ_HANDLED;
>>> +}
>>> +
>>> +static struct timer_of to = {
>>> +     .flags = TIMER_OF_IRQ | TIMER_OF_BASE,
>>
>> Why not the TIMER_OF_CLOCK ?
> 
> The timer's clock is fixed to 32.768K and no need to divide the
> frequency, so our clock tree does not supply the timer's clock now.

The driver is fine. However, I would like to unify the clk usage in the
timer driver, so if you refer to a clock so the TIMER_OF_CLOCK can be
used, that will nice.



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