linux-kernel - Re: [PATCH v4 1/4] clocksource: stm32: convert driver to timer

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Message-ID: <28b1df26-8375-1a38-b918-39b80390ef7d@linaro.org>
Date:   Tue, 17 Oct 2017 19:53:32 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ludovic Barre <ludovic.barre@...com>,
        devicetree@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/4] clocksource: stm32: convert driver to timer_of

On 17/10/2017 19:34, Benjamin Gaignard wrote:
> 2017-10-17 19:09 GMT+02:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
>> On 02/10/2017 17:51, Benjamin Gaignard wrote:
>>> Convert driver to use timer_of helpers. This allow to remove
>>> custom proprietary structure.
>>>
>>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
>>> ---
>>
>> [ ... ]
>>
>>> -     clockevents_config_and_register(&data->evtdev,
>>> -                                     DIV_ROUND_CLOSEST(rate, prescaler),
>>> -                                     0x1, max_delta);
>>> -
>>> -     ret = request_irq(irq, stm32_clock_event_handler, IRQF_TIMER,
>>> -                     "stm32 clockevent", data);
>>> -     if (ret) {
>>> -             pr_err("%pOF: failed to request irq.\n", np);
>>> -             goto err_get_irq;
>>> -     }
>>> +     clockevents_config_and_register(&to->clkevt,
>>> +                                     timer_of_period(to), 0x60, max_delta);
>>
>>
>> Why 0x1 -> 0x60 ?
> 
> Because if the min delta is too small it could generate too much interrupts
> and the system will not be able to catch all of them.

You did a change not related to what is described in the log.

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