s390/time: Add clocksource id to TOD clock

To allow specifying the clock source in the upcoming PtP driver,
add a clocksource ID to the s390 TOD clock.

Acked-by: Heiko Carstens <[email protected]>
Acked-by: Richard Cochran <[email protected]>
Signed-off-by: Sven Schnelle <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: svens-s390

arch/s390/kernel/time.c

@@ -255,6 +255,7 @@ static struct clocksource clocksource_tod = {
 	.shift		= 24,
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 	.vdso_clock_mode = VDSO_CLOCKMODE_TOD,
+	.id		= CSID_S390_TOD,
 };
 
 struct clocksource * __init clocksource_default_clock(void)

include/linux/clocksource_ids.h

@@ -6,6 +6,7 @@
 enum clocksource_ids {
 	CSID_GENERIC		= 0,
 	CSID_ARM_ARCH_COUNTER,
+	CSID_S390_TOD,
 	CSID_X86_TSC_EARLY,
 	CSID_X86_TSC,
 	CSID_X86_KVM_CLK,