linux-kernel - Re: [PATCH v3 28/38] rtc: add HAS

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Date:   Tue, 09 May 2023 11:46:16 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Geert Uytterhoeven" <geert@...ux-m68k.org>
Cc:     "Niklas Schnelle" <schnelle@...ux.ibm.com>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        "Alessandro Zummo" <a.zummo@...ertech.it>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Alan Stern" <stern@...land.harvard.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Albert Ou" <aou@...s.berkeley.edu>, linux-kernel@...r.kernel.org,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-pci@...r.kernel.org, "Arnd Bergmann" <arnd@...nel.org>,
        linux-rtc@...r.kernel.org,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: [PATCH v3 28/38] rtc: add HAS_IOPORT dependencies

On Tue, May 9, 2023, at 10:51, Geert Uytterhoeven wrote:
> On Tue, May 9, 2023 at 10:23 AM Arnd Bergmann <arnd@...db.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_defconfig
> 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