linux-kernel - Re: [PATCH v3 3/5] reset: stm32: use the reset-simple driver

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Date:   Thu, 17 Aug 2017 10:19:54 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Alexandru Gagniuc <alex.g@...ptrum.com>,
        Andreas Färber <afaerber@...e.de>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Baoyou Xie <baoyou.xie@...aro.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        Dinh Nguyen <dinguyen@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 3/5] reset: stm32: use the reset-simple driver

Hi,

On 16/08/17 21:55, Alexandru Gagniuc wrote:
> 
> 
> On 08/16/2017 01:52 PM, Andreas Färber wrote:
>> Am 16.08.2017 um 22:50 schrieb Alexandru Gagniuc:
>>> On 08/16/2017 02:46 AM, Philipp Zabel wrote:
>>>> The reset-simple driver can be used without changes.
>>>>
>>>> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
>>>
>>> Reviewed-by: Alexandru Gagniuc <alex.g@...ptrum.com>
>>>
>>>> ---
>>>>  drivers/reset/Kconfig        |  11 ++---
>>>>  drivers/reset/Makefile       |   1 -
>>>>  drivers/reset/reset-simple.c |   1 +
>>>>  drivers/reset/reset-stm32.c  | 108
>>>> -------------------------------------------
>>>>  4 files changed, 4 insertions(+), 117 deletions(-)
>>>>  delete mode 100644 drivers/reset/reset-stm32.c
>>>>
>>>> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
>>>> index 78a8f6057985b..29f4487c290fc 100644
>>>> --- a/drivers/reset/Kconfig
>>>> +++ b/drivers/reset/Kconfig
>>>> @@ -70,19 +70,14 @@ config RESET_PISTACHIO
>>>>
>>>>  config RESET_SIMPLE
>>>>      bool "Simple Reset Controller Driver" if COMPILE_TEST
>>>> -    default ARCH_SOCFPGA || ARCH_SUNXI
>>>> +    default ARCH_SOCFPGA || ARCH_STM32 || ARCH_SUNXI
>>>
>>> If this series gets respun, could you please look into removing the
>>> ARCH_ dependency here?
>>
>> Why?
> 
> Because the driver has to keep track of all its users, which is a
> layering violation.

"keep track of all its users": not necessarily, this is mostly for
convenience reasons to get automatic coverage for those SoCs without
changing various defconfigs - or distribution .configs, for that matter.
Especially the latter may prove to be nasty and introduce regressions.

But I see that this list may grow big and this is a bit beyond the scope
of the otherwise neat "default ARCH_xxx" trick.

So given the generic nature of this driver, can't we make this simply:
"default ARM || ARM64"
That would enable it everywhere automatically, but people can still
disable this if they know what they do.

Alternatively for ARM64 this is actually a candidate for the (one and
only) defconfig.

Cheers,
Andre.

>> It's not a dependency, just the default. Doing it here decouples it
>> from having to do Kconfig changes in the arm-soc tree as well.
> 
> Doing it here allows this list to grow without bounds.
> 
>> Regards,
>> Andreas
>>