[RFC PATCH 08/10] clocksource: time-pistachio: Register the persistent clock

[Baolin Wang]

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.w...@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