* Re: [PATCH 1/2] char: PC rtc: replace blacklist with whitelist
[not found] ` <4192558.Mh1hb3LCLb@wuerfel>
@ 2016-04-18 7:09 ` Geert Uytterhoeven
[not found] ` <CAMuHMdWQiqNq7-fgn5NONovLQxhOoGD5s-TAYVYZOVRfEs52Zg@mail.gmail.com>
1 sibling, 0 replies; 2+ messages in thread
From: Geert Uytterhoeven @ 2016-04-18 7:09 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Greg Kroah-Hartman, linux-arm-kernel@lists.infradead.org,
RTCLINUX, Alexandre Belloni, linux-kernel@vger.kernel.org,
linux-m68k
Hi Arnd,
cc linux-m68k
On Sun, Apr 17, 2016 at 11:37 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 02 March 2016 11:22:04 Geert Uytterhoeven wrote:
>> On Wed, Mar 2, 2016 at 10:48 AM, Arnd Bergmann <arnd@arndb.de> wrote:
>> > Every new architecture has to add itself to the growing list of those
>> > that do not support the legacy PC RTC driver.
>> >
>> > This replaces the long list of architectures that don't support it
>> > with a shorter list of those that do.
>> >
>> > The list is taken from those architectures that have a non-empty
>> > asm/mc146818rtc.h header file and were not explicitly blacklisted.
>>
>> M68K was blacklisted...
>
> I never got back to you on this topic, sorry about that. I've fixed
> up the patch to leave out m68k now.
>
> On a semi-related note, I see that m68k is one of the few architectures
> still using the (other) genrtc driver. It would be nice to reduce that
> list and change m68k to use its own rtc driver (ideally one per
We do have hp_sdc_rtc (HP9000/300; why is that under drivers/input/misc/?),
and rtc-msm6242 and rtc-rp5c01 (both for Amiga).
> platform), but the q40 platform is the only one providing
> get_rtc_pll()/set_rtc_pll() for the RTC_PLL_GET/RTC_PLL_SET ioctl
> commands.
Do you mean this is a problem?
> If we do this change on top of the other m68k patch I have, the
> rtc-generic driver should be usable as a full replacement for
> genrtc.c on m68k and we can remove all the set_rtc_pll/get_rtc_pll
> handling from genrtc.
>
> diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
> index 773b2187210d..f4781d612c37 100644
> --- a/arch/m68k/kernel/time.c
> +++ b/arch/m68k/kernel/time.c
> @@ -100,7 +100,32 @@ static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
> return 0;
> }
>
> +static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
> +{
> + struct rtc_pll_info pll;
> + struct rtc_pll_info __user *argp = (void __user *)arg;
> +
> + switch (cmd) {
> + case RTC_PLL_GET:
> + if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
> + return -EINVAL;
> + return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
> +
> + case RTC_PLL_SET:
> + if (!mach_set_rtc_pll)
> + return -EINVAL;
> + if (!capable(CAP_SYS_TIME))
> + return -EACCES;
> + if (copy_from_user(&pll, argp, sizeof(pll)))
> + return -EFAULT;
> + return mach_set_rtc_pll(&pll);
> + }
> +
> + return -ENOIOCTLCMD;
> +}
> +
> static const struct rtc_class_ops generic_rtc_ops = {
> + .ioctl = rtc_ioctl,
> .read_time = rtc_generic_get_time,
> .set_time = rtc_generic_set_time,
> };
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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
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