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Date:   Tue, 09 May 2023 11:46:16 +0200
From:   "Arnd Bergmann" <arnd@arndb.de>
To:     "Geert Uytterhoeven" <geert@linux-m68k.org>
Cc:     "Niklas Schnelle" <schnelle@linux.ibm.com>,
        "Alexandre Belloni" <alexandre.belloni@bootlin.com>,
        "Alessandro Zummo" <a.zummo@towertech.it>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
        "Bjorn Helgaas" <bhelgaas@google.com>,
        =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>,
        "Mauro Carvalho Chehab" <mchehab@kernel.org>,
        "Alan Stern" <stern@rowland.harvard.edu>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        "Paul Walmsley" <paul.walmsley@sifive.com>,
        "Palmer Dabbelt" <palmer@dabbelt.com>,
        "Albert Ou" <aou@eecs.berkeley.edu>, linux-kernel@vger.kernel.org,
        Linux-Arch <linux-arch@vger.kernel.org>,
        linux-pci@vger.kernel.org, "Arnd Bergmann" <arnd@kernel.org>,
        linux-rtc@vger.kernel.org,
        linux-m68k <linux-m68k@lists.linux-m68k.org>
Subject: Re: [PATCH v3 28/38] rtc: add HAS_IOPORT dependencies
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On Tue, May 9, 2023, at 10:51, Geert Uytterhoeven wrote:
> On Tue, May 9, 2023 at 10:23=E2=80=AFAM Arnd Bergmann <arnd@arndb.de> =
wrote:
>> On Tue, May 9, 2023, at 08:38, Geert Uytterhoeven wrote:
>> If you ever want to revisit this, I suspect the harder part here
>> is to detach arch/m68k/ from the RTC_DRV_GENERIC code first, pushing
>> the device registration into the individual machine specific time.c
>> code. It's probably not even worth trying to share the rtc-cmos
>> driver, but it might be useful to share the library code like
>> RTC_DRV_ALPHA does.
>
> Arch/m68k is not that entangled with RTC_DRV_GENERIC, as amiga_defconf=
ig
> does not enable it, but enables CONFIG_RTC_DRV_MSM6242 and
> CONFIG_RTC_DRV_RP5C01 instead.

Ah, I see now, I misremembered this part. The only bit that
is shared on m68k is the mach_hwclk() function that is used
for either read_persistent_clock64() or rtc_generic on platforms
that have one. So any platform could indeed be converted from
mach_hwclk() to a custom rtc driver without affecting the others.

    Arnd