linux-kernel - Re: [RFC/PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

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Message-ID: <20151005105034.GU23801@atomide.com>
Date:	Mon, 5 Oct 2015 03:50:34 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Felipe Balbi <balbi@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tglx@...utronix.de, John Stultz <john.stultz@...aro.org>
Subject: Re: [RFC/PATCH 09/11] clocksource: add TI 32.768 Hz counter driver

* Daniel Lezcano <daniel.lezcano@...aro.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.

Regards,

Tony
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