linux-kernel - Re: [PATCH v8 09/16] clockevents/drivers: Add STM32 Timer driver

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Message-ID: <555AF143.2060807@linaro.org>
Date:	Tue, 19 May 2015 10:16:03 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:	Uwe Kleine-König 
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Subject: Re: [PATCH v8 09/16] clockevents/drivers: Add STM32 Timer driver

On 05/18/2015 04:03 PM, Maxime Coquelin wrote:
> 2015-05-18 15:10 GMT+02:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
>> On 05/09/2015 09:53 AM, Maxime Coquelin wrote:
>>>
>>> STM32 MCUs feature 16 and 32 bits general purpose timers with prescalers.
>>> The drivers detects whether the time is 16 or 32 bits, and applies a
>>> 1024 prescaler value if it is 16 bits.
>>>
>>> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>>> Tested-by: Chanwoo Choi <cw00.choi@...sung.com>
>>> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com>
>>> ---
>>>    drivers/clocksource/Kconfig       |   8 ++
>>>    drivers/clocksource/Makefile      |   1 +
>>>    drivers/clocksource/timer-stm32.c | 184
>>> ++++++++++++++++++++++++++++++++++++++
>>>    3 files changed, 193 insertions(+)
>>>    create mode 100644 drivers/clocksource/timer-stm32.c
>>>
>>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>>> index bf9364c..2443520 100644
>>> --- a/drivers/clocksource/Kconfig
>>> +++ b/drivers/clocksource/Kconfig
>>> @@ -106,6 +106,14 @@ config CLKSRC_EFM32
>>>            Support to use the timers of EFM32 SoCs as clock source and
>>> clock
>>>            event device.
>>>
>>> +config CLKSRC_STM32
>>> +       bool "Clocksource for STM32 SoCs" if !ARCH_STM32
>>> +       depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
>>
>>
>> Are the interactive bool and the 'COMPILE_TEST' necessary ?
>>
>
> The interactive bool is necessary if we want to be able to
> select/deselect it in COMPILE_TEST configuration.
> And personnaly, I think COMPILE_TEST use makes sense.
>
> Note that other timer drivers are doing the same thing today
> (CLKSRC_EFM32, SH_TIMER_CMT, EM_TIMER_STI...).
>
> Do you have a specific concern regarding COMPILE_TEST?

Actually, we try to keep the timer selection non-interactive and let the 
platform's Kconfig to select the timer.

I like when the code is consistent. The COMPILE_TEST was introduced and 
created a precedence. I would like to get rid of the interactive timer 
selection but I did not have time to go through this yet.


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