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

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Message-ID: <20191120100341.GK25745@shell.armlinux.org.uk>
Date:   Wed, 20 Nov 2019 10:03:41 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Arnd Bergmann <arnd@...db.de>, 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>,
        Lennert Buytenhek <kernel@...tstofly.org>
Subject: Re: [PATCH] watchdog: Remove iop_wdt

On Tue, Nov 19, 2019 at 06:29:09AM -0800, Guenter Roeck wrote:
> 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.

Doesn't mean that there aren't interested parties.  I still have
IOP32x hardware running here in the form of a N2100 (my firewall)
and it seems that I never noticed this option disappearing until
now...

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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