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clocksource: allow to have multiple device from clock source 

use the one with the most priority.

We can not select the clocksource at user level.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2017-03-03 13:34:01 +01:00 committed by Sascha Hauer
parent 92c1033036
commit 6bc48eabbf
2 changed files with 13 additions and 1 deletions
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11
common/clock.c
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@ -213,6 +213,17 @@ EXPORT_SYMBOL(mdelay_non_interruptible);
int init_clock(struct clocksource *cs)
{
if (current_clock && cs->priority <= current_clock->priority)
return 0;
if (cs->init) {
int ret;
ret = cs->init(cs);
if (ret)
return ret;
}
current_clock = cs;
time_beginning = get_time_ns();

3
include/clock.h
View File

@ -12,7 +12,8 @@ struct clocksource {
uint64_t (*read)(void);
uint64_t cycle_last;
uint64_t mask;
int priority;
int (*init)(struct clocksource*);
};
static inline uint32_t cyc2ns(struct clocksource *cs, uint64_t cycles)