All of lore.kernel.org
 help / color / mirror / Atom feed
From: Joshua Kinard <kumba@gentoo.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Willy Tarreau <w@1wt.eu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ben Greear <greearb@candelatech.com>, Ingo Molnar <mingo@elte.hu>,
	LKML <linux-kernel@vger.kernel.org>,
	stable@kernel.org
Subject: Re: [stable] [patch 3/3] rtc: Limit frequency
Date: Sat, 06 Aug 2011 03:28:26 -0400	[thread overview]
Message-ID: <4E3CED1A.2040200@gentoo.org> (raw)
In-Reply-To: <1312535060.2764.12.camel@work-vm>

On 08/05/2011 05:04, John Stultz wrote:
> Yea, I submitted a slightly different version of Thomas' patch which set
> it to 8192Hz via the tip tree, but the original one went upstream first.
> I'm away from home right now, so I'll be re-submitting just that change
> probably next week.

Awesome, I'll look out for it if I get free time to look at the RTC driver I have.  It's broken now due to a loss of
__symbol_get(), as I was trying to find a way to make the driver determine if it was a module or not.


> I'm torn here. It would be good to have the functionality listed in some
> way so it is documented. However as we abstract the RTC to be more of an
> internal tool for the kernel, rather then hardware directly addressed
> from userland, the PIE mode is really not as useful (and quite messier
> to multiplex).  I'd much rather try to extend the alarm interfaces to
> allow for higher resolution, so it could be used as a alarmed highres
> oneshot timer if the hardware supports it.

That's why I think a wrapper would be best.  By default, it would use the hrtimer code and so, none of the existing
drivers would need to be modified.  Any driver that wants to, however, could override the base functions if they wanted
to provide that functionality separately.  It should probably be a CONFIG_* option, though.  Right now, consumers of
DS1685 are rare: old SGI O2 systems and some embedded board from 'electronic systems Gmbh', one of whose employees wrote
the original driver about 2 years ago.  The driver I have now handles older versions (DS1689/1693) and the more common
DS17x8y versions, and those I think are the most modern.  Not sure what systems use those, however.

-- 
Joshua Kinard
Gentoo/MIPS
kumba@gentoo.org
4096R/D25D95E3 2011-03-28

"The past tempts us, the present confuses us, the future frightens us.  And our lives slip away, moment by moment, lost
in that vast, terrible in-between."

--Emperor Turhan, Centauri Republic

  reply	other threads:[~2011-08-06  7:35 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-22  9:12 [patch 0/3] rtc: Assorted bug fixes Thomas Gleixner
2011-07-22  9:12 ` [patch 1/3] rtc: Handle errors correctly in rtc_irq_set_state() Thomas Gleixner
2011-07-22 22:04   ` Andrew Morton
2011-07-23  7:15     ` Thomas Gleixner
2011-07-22  9:12 ` [patch 3/3] rtc: Limit frequency Thomas Gleixner
2011-07-22 22:05   ` Andrew Morton
2011-07-22 22:39     ` [stable] " Willy Tarreau
2011-08-05  3:39       ` Joshua Kinard
2011-08-05  9:04         ` John Stultz
2011-08-06  7:28           ` Joshua Kinard [this message]
2011-07-23  7:17     ` Thomas Gleixner
2011-07-22  9:12 ` [patch 2/3] rtc: Fix hrtimer deadlock Thomas Gleixner
2011-07-22 22:11   ` Andrew Morton
2011-07-23  7:22     ` Thomas Gleixner

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4E3CED1A.2040200@gentoo.org \
    --to=kumba@gentoo.org \
    --cc=akpm@linux-foundation.org \
    --cc=greearb@candelatech.com \
    --cc=john.stultz@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=stable@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=w@1wt.eu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.