linux-kernel - Re: [PATCH v9 4/6] clocksource: stm32: add clocksource support

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Message-ID: <CA+M3ks7DQ7xH8WyKkwjU+=XHFjAE=N7hvsN8Pcxpkz1L5LHqKQ@mail.gmail.com>
Date:   Fri, 8 Dec 2017 15:19:24 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...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>,
        Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH v9 4/6] clocksource: stm32: add clocksource support

2017-12-08 15:08 GMT+01:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
> On 08/12/2017 15:04, Benjamin Gaignard wrote:
>> 2017-12-08 14:46 GMT+01:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
>>> On 08/12/2017 12:32, Benjamin Gaignard wrote:
>>>> The stm32 timer hardware is currently only used as a clock event device,
>>>> but it can be utilized as a clocksource as well.
>>>>
>>>> Implement this by enabling the free running counter in the hardware block
>>>> and converting the clock event part from a count down event timer to a
>>>> comparator based timer.
>>>
>>>
>>> Split this patch in two:
>>>  - periodic support
>>>  - clocksource support
>>
>> No because the way of implementing periodic support depend of how clocksource
>> part is implemented on the hardware.
>> I don't want to code functions that I will completely remove just after
>
> Sorry, I don't get it. Can you elaborate please ?

To add clocksource support I use the counter part of the hardware
which was before
used for clockevent and make clockevent use the comparator instead.
So implementing periodic on counter side of the hardware is a waste of
time because
I will to remove right after

>
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