linux-kernel - [PATCH 5/8] clocksource: timer-ti-32k: Register the persistent clock

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Date:   Wed, 13 Jun 2018 19:32:32 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     tglx@...utronix.de, john.stultz@...aro.org,
        daniel.lezcano@...aro.org, arnd@...db.de, tony@...mide.com,
        aaro.koskinen@....fi, linux@...linux.org.uk, mark.rutland@....com,
        marc.zyngier@....com
Cc:     baolin.wang@...aro.org, broonie@...nel.org,
        paulmck@...ux.vnet.ibm.com, mlichvar@...hat.com,
        rdunlap@...radead.org, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, pombredanne@...b.com,
        thierry.reding@...il.com, jonathanh@...dia.com, heiko@...ech.de,
        linus.walleij@...aro.org, viresh.kumar@...aro.org,
        mingo@...nel.org, hpa@...or.com, peterz@...radead.org,
        douly.fnst@...fujitsu.com, len.brown@...el.com,
        rajvi.jingar@...el.com, alexandre.belloni@...tlin.com,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [PATCH 5/8] clocksource: timer-ti-32k: Register the persistent clock

Since the 32K counter is always available, then we can register the
persistent clock to compensate the suspend time for the OS time.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/clocksource/Kconfig        |    1 +
 drivers/clocksource/timer-ti-32k.c |    4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 5e51fcf..3cd136f 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -262,6 +262,7 @@ config CLKSRC_TI_32K
 	bool "Texas Instruments 32.768 Hz Clocksource" if COMPILE_TEST
 	depends on GENERIC_SCHED_CLOCK
 	select TIMER_OF if OF
+	select PERSISTENT_CLOCK
 	help
 	  This option enables support for Texas Instruments 32.768 Hz clocksource
 	  available on many OMAP-like platforms.
diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c
index 880a861..353ff9d 100644
--- a/drivers/clocksource/timer-ti-32k.c
+++ b/drivers/clocksource/timer-ti-32k.c
@@ -41,6 +41,7 @@
 #include <linux/clocksource.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/persistent_clock.h>
 
 /*
  * 32KHz clocksource ... always available, on pretty most chips except
@@ -120,6 +121,9 @@ static int __init ti_32k_timer_init(struct device_node *np)
 	}
 
 	sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
+	persistent_clock_init_and_register(omap_32k_read_sched_clock,
+					   CLOCKSOURCE_MASK(32), 32768, 0);
+
 	pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
 
 	return 0;
-- 
1.7.9.5