linux-kernel - Re: [PATCH v4 01/03] clocksource: Add Kconfig entries for CMT, MTU2, TMU and STI

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Message-ID: <CANqRtoTGuXnGT0LW+et0w6U6QOC8x8xx0OEEqxQH8X6EtWrEcg@mail.gmail.com>
Date:	Fri, 13 Dec 2013 19:12:58 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Olof Johansson <olof@...om.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	SH-Linux <linux-sh@...r.kernel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Simon Horman [Horms]" <horms@...ge.net.au>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 01/03] clocksource: Add Kconfig entries for CMT, MTU2,
 TMU and STI

Hi Olof,

On Thu, Dec 12, 2013 at 10:05 AM, Olof Johansson <olof@...om.net> wrote:
> Hi,
>
> A couple of small comments below.

Thanks for your feedback!

> On Thu, Dec 12, 2013 at 08:56:26AM +0900, Magnus Damm wrote:
>> From: Magnus Damm <damm@...nsource.se>
>>
>> Add Kconfig entries for CMT, MTU2, TMU and STI to
>> drivers/clocksource/Kconfig. This will allow us to
>> get rid of duplicated entires in architecture code
>> such as arch/sh and arch/arm/mach-shmobile.
>>
>> Signed-off-by: Magnus Damm <damm@...nsource.se>
>> ---
>>
>>  drivers/clocksource/Kconfig |   44 +++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 44 insertions(+)
>>
>> --- 0001/drivers/clocksource/Kconfig
>> +++ work/drivers/clocksource/Kconfig  2013-12-12 08:41:55.000000000 +0900
>> @@ -134,3 +134,47 @@ config VF_PIT_TIMER
>>       bool
>>       help
>>         Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
>> +
>> +config SYS_SUPPORTS_CMT
>> +        bool
>> +
>> +config SYS_SUPPORTS_TMU
>> +        bool
>> +
>> +config SYS_SUPPORTS_MTU2
>> +        bool
>> +
>> +config SYS_SUPPORTS_STI
>> +        bool
>
> Maybe a prefix to avoid namespace collissions here?

Sure, that is fine with me. I based the ones above on already existing
ones used by SH but I don't mind reworking those.

How about SYS_SUPPORTS_CLKSRC_xxx?

>> +config SH_TIMER_CMT
>> +     bool "Renesas CMT timer driver" if COMPILE_TEST
>> +     default SYS_SUPPORTS_CMT
>
> It might be useful to have an explicit depends on ARCH_SH || ARCH_SHMOBILE
> || COMPILE_TEST on these, just to make it easier for someone reading
> the code later on.

I have any strong feelings one way or the other about that myself, but
I got the impression that John Stultz preferred to not allow manual
selection at all, and my compromise here is to allow it only when
COMPILE_TEST is selected.

Would you be ok to keep it as-is for now? If needed then we can add an
incremental patch later to enable more flexible selection.

Thanks,

/ magnus
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