linux-kernel - Re: char: legacy RTC cleanups

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Date:	Wed, 27 Apr 2016 10:41:02 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Luck <tony.luck@...el.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Rich Felker <dalias@...c.org>,
	David Howells <dhowells@...hat.com>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	alpha <linux-alpha@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Parisc List <linux-parisc@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	RTCLINUX <rtc-linux@...glegroups.com>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: char: legacy RTC cleanups

Hi Arnd,

On Wed, Apr 27, 2016 at 10:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 27 April 2016 09:54:41 Geert Uytterhoeven wrote:
>> On Tue, Apr 26, 2016 at 11:44 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> > For the genrtc driver, rearranging the headers makes it simpler
>> > to use and reduces duplication. In case of alpha and mn10300,
>> > I've shown that the genrtc and rtc drivers are doing the same
>> > thing, so we don't need them both. The remaining three
>> > architectures (m68k, parisc, powerpc) actually all support
>> > the newer rtc-generic driver, so we could remove genrtc completely
>> > if we want to.
>>
>> CONFIG_GEN_RTC is not enabled in any of the m68k defconfigs, so I think genrtc
>> has been unused for a while.
>> All defconfigs either use CONFIG_RTC_DRV_GENERIC, or enable a more specific
>> RTC driver.
>
> Ok, good to know. I'm guessing the same is true for parisc, but there are
> also very few users.
>
> Regarding the Q40 specific ioctls, what do you think this means, is it
>
> a) nobody uses Q40 with modern kernels,
> b) nobody calls RTC_PLL_GET/RTC_PLL_SET on q40, or
> c) Q40 users have their own configurations and enable GEN_RTC?

To be honest, I have no idea. There have never been many Q40 users.
(old) http://www.linux-m68k.org/Registry/Statistics.html shows only 8.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds