From: Tony Lindgren <tony@atomide.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Felipe Balbi <balbi@ti.com>, John Stultz <john.stultz@linaro.org>,
tglx@linutronix.de,
Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
Linux ARM Kernel Mailing List
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC/PATCH 09/11] clocksource: add TI 32.768 Hz counter driver
Date: Mon, 5 Oct 2015 04:03:36 -0700 [thread overview]
Message-ID: <20151005110336.GX23801@atomide.com> (raw)
In-Reply-To: <20151005105034.GU23801@atomide.com>
* Tony Lindgren <tony@atomide.com> [151005 03:56]:
> * Daniel Lezcano <daniel.lezcano@linaro.org> [151001 15:04]:
> > >+ clocks_calc_mult_shift(&persistent_mult, &persistent_shift,
> > >+ 32768, NSEC_PER_SEC, 120000);
> > >+
> > >+ ret = clocksource_mmio_init(sync32k_cnt_reg, "32k_counter", 32768,
> > >+ 250, 32, clocksource_mmio_readl_up);
> > >+ if (ret) {
> > >+ pr_err("32k_counter: can't register clocksource\n");
> > >+ return;
> > >+ }
> > >+
> > >+ sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
> > >+ register_persistent_clock(NULL, omap_read_persistent_clock64);
> >
> > I will let John Stultz to have a look at this part because I have doubt
> > regarding the usage of the persistent clock.
>
> The persistent clock we want to keep for deeper idle states..
> Especially when we start changing clocksource for the duration of
> deeper idle states. I'll post some updated patches on that when I
> get a chance.
But sounds like we can just have read_persistent_clock() check
for the CLOCK_SOURCE_SUSPEND_NONSTOP like I pointed in the other
patch in this series.
Tony
next prev parent reply other threads:[~2015-10-05 11:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-29 20:43 [RFC/PATCH 00/11] arm: omap: counter32k rework Felipe Balbi
2015-09-29 20:43 ` [RFC/PATCH 01/11] arm: omap2: timer: get rid of obfuscating macros Felipe Balbi
2015-09-29 20:43 ` [RFC/PATCH 02/11] arm: omap2: timer: add a gptimer argument to sync32k_timer_init() Felipe Balbi
2015-09-29 20:43 ` [RFC/PATCH 03/11] arm: omap2: timer: remove __omap_gptimer_init() Felipe Balbi
2015-10-05 11:01 ` Tony Lindgren
2015-10-05 15:24 ` Felipe Balbi
2015-10-05 16:02 ` Tony Lindgren
2015-10-05 16:08 ` Felipe Balbi
2015-10-05 16:30 ` Tony Lindgren
2015-09-29 20:43 ` [RFC/PATCH 04/11] arm: omap2: timer: provide generic sync32k_timer_init function Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 05/11] arm: omap2: timer: move realtime_counter_init() around Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 06/11] arm: omap2: timer: always call clocksource_of_init() when DT Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 07/11] arm: omap2: timer: remove omap4_local_timer_init Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 08/11] arm: omap2: timer: rename omap_sync32k_timer_init() Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 09/11] clocksource: add TI 32.768 Hz counter driver Felipe Balbi
2015-10-01 21:58 ` John Stultz
2015-10-01 21:59 ` Daniel Lezcano
2015-10-05 10:50 ` Tony Lindgren
2015-10-05 11:03 ` Tony Lindgren [this message]
2015-10-01 22:20 ` John Stultz
2015-10-01 22:30 ` Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 10/11] arm: omap2: timer: limit hwmod usage to non-DT boots Felipe Balbi
2015-09-29 20:44 ` [RFC/PATCH 11/11] arm: boot: dts: omap: add missing default status for 32k counter Felipe Balbi
2015-09-30 8:15 ` Arnd Bergmann
2015-09-30 14:12 ` Felipe Balbi
2015-09-30 21:58 ` Arnd Bergmann
2015-10-05 17:52 ` Felipe Balbi
2015-10-05 19:41 ` Felipe Balbi
2015-10-06 8:08 ` Arnd Bergmann
2015-10-06 14:57 ` Felipe Balbi
2015-10-06 15:18 ` Tony Lindgren
2015-10-06 15:29 ` Felipe Balbi
2015-10-05 10:45 ` Tony Lindgren
2015-09-30 8:22 ` [RFC/PATCH 00/11] arm: omap: counter32k rework Arnd Bergmann
2015-09-30 14:13 ` Felipe Balbi
2015-09-30 14:42 ` Arnd Bergmann
2015-09-30 14:49 ` Arnd Bergmann
2015-09-30 14:57 ` Felipe Balbi
2015-09-30 15:03 ` Thierry Reding
2015-10-01 22:12 ` Daniel Lezcano
2015-10-05 10:55 ` Tony Lindgren
2015-10-05 11:03 ` Arnd Bergmann
2015-10-05 11:13 ` Tony Lindgren
2015-10-05 12:19 ` Arnd Bergmann
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