linux-kernel - Re: [PATCH] watchdog: Remove iop

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Date:   Tue, 19 Nov 2019 06:29:09 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Laura Abbott <labbott@...hat.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Lennert Buytenhek <kernel@...tstofly.org>
Subject: Re: [PATCH] watchdog: Remove iop_wdt

On 11/19/19 1:40 AM, Arnd Bergmann wrote:
> On Tue, Nov 19, 2019 at 3:08 AM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> On 11/18/19 2:04 PM, Laura Abbott wrote:
>>>
>>> Commit 59d3ae9a5bf6 ("ARM: remove Intel iop33x and iop13xx support")
>>> removed support for some old platforms. Given this driver depends on
>>> a now removed platform, just remove the driver.
>>>
>>> Signed-off-by: Laura Abbott <labbott@...hat.com>
>>> ---
>>> Found this while reviewing config options. Not sure if this was kept
>>> around for other reasons or just missed.
>>> ---
>>>    drivers/watchdog/Kconfig   |  16 ---
>>>    drivers/watchdog/Makefile  |   1 -
>>>    drivers/watchdog/iop_wdt.c | 249 -------------------------------------
>>>    3 files changed, 266 deletions(-)
>>>    delete mode 100644 drivers/watchdog/iop_wdt.c
>>>
>>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>>> index 58e7c100b6ad..fef9078a44b6 100644
>>> --- a/drivers/watchdog/Kconfig
>>> +++ b/drivers/watchdog/Kconfig
>>> @@ -554,22 +554,6 @@ config PNX4008_WATCHDOG
>>>
>>>          Say N if you are unsure.
>>>
>>> -config IOP_WATCHDOG
>>> -     tristate "IOP Watchdog"
>>> -     depends on ARCH_IOP13XX
>>> -     select WATCHDOG_NOWAYOUT if (ARCH_IOP32X || ARCH_IOP33X)
>>
>> This is a bit confusing, but it suggests that the watchdog may also work
>> with ARCH_IOP32X, which is still supported. I don't know anything about
>> those architectures, but I hesitate to have the driver removed unless
>> we have confirmation that it won't work with ARCH_IOP32X.
>> Maybe the dependency needs to be updated instead ?
> 
> See commit ec2e32ca661e ("watchdog: iop_wdt only builds for
> mach-iop13xx") from 2014: the watdog hardware exists on iop32x
> but the driver only successfully built on iop13xx, which is now gone.
> 
> Adding Russell (who said he still uses iop32x hardware) and Lennert
> (who is still listed in the MAINTAINERS file, but previously said he
> does not use it any more) to Cc. If neither of them see a reason to
> keep the driver, I'd say we can remove it.
> 
> It seems unlikely that anyone wants to revive the driver if they have
> not done it yet, and if they want to do it later, it is barely harder to revert
> the removal than to fix the compile-time problem.
> 

Good point, especially since apparently no one cared for five years.

Guenter