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From:   Baolin Wang <baolin.wang@linaro.org>
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Subject: [RFC PATCH 08/10] clocksource: time-pistachio: Register the persistent clock
Date:   Mon, 14 May 2018 16:55:34 +0800
Message-Id: <e923209285df7043bd52c136ba85507891b4b059.1526285602.git.baolin.wang@linaro.org>
In-Reply-To: <cover.1526285602.git.baolin.wang@linaro.org>
References: <cover.1526285602.git.baolin.wang@linaro.org>
In-Reply-To: <cover.1526285602.git.baolin.wang@linaro.org>
References: <cover.1526285602.git.baolin.wang@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Since the timer on pistachio platform is always available, we can
register it as one persistent clock to compensate the suspend time
for the OS time.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
 drivers/clocksource/Kconfig          |    1 +
 drivers/clocksource/time-pistachio.c |    3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index ed19757..b45be75 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -255,6 +255,7 @@ config CLKSRC_PISTACHIO
 	bool "Clocksource for Pistachio SoC" if COMPILE_TEST
 	depends on HAS_IOMEM
 	select TIMER_OF
+	select PERSISTENT_CLOCK
 	help
 	  Enables the clocksource for the Pistachio SoC.
 
diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index a2dd85d..5c3eb71 100644
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -20,6 +20,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/persistent_clock.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/sched_clock.h>
@@ -212,6 +213,8 @@ static int __init pistachio_clksrc_of_init(struct device_node *node)
 
 	raw_spin_lock_init(&pcs_gpt.lock);
 	sched_clock_register(pistachio_read_sched_clock, 32, rate);
+	persistent_clock_init_and_register(pistachio_read_sched_clock,
+					   CLOCKSOURCE_MASK(32), rate, 0);
 	return clocksource_register_hz(&pcs_gpt.cs, rate);
 }
 TIMER_OF_DECLARE(pistachio_gptimer, "img,pistachio-gptimer",
-- 
1.7.9.5