diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index 262d10453cb8..141ffaeb976c 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -53,6 +53,8 @@ MODULE_LICENSE("GPL");
 
 #define RTC_BITS 55 /* 55 bits for this implementation */
 
+static struct k_clock sgi_clock;
+
 extern unsigned long sn_rtc_cycles_per_second;
 
 #define RTC_COUNTER_ADDR        ((long *)LOCAL_MMR_ADDR(SH_RTC))
@@ -763,10 +765,18 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
 	return err;
 }
 
+static int sgi_clock_getres(const clockid_t which_clock, struct timespec *tp)
+{
+	tp->tv_sec = 0;
+	tp->tv_nsec = sgi_clock.res;
+	return 0;
+}
+
 static struct k_clock sgi_clock = {
 	.res = 0,
 	.clock_set	= sgi_clock_set,
 	.clock_get	= sgi_clock_get,
+	.clock_getres	= sgi_clock_getres,
 	.timer_create	= sgi_timer_create,
 	.timer_set	= sgi_timer_set,
 	.timer_del	= sgi_timer_del,
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 7f66143d1ce5..748497fffd0f 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -182,14 +182,6 @@ static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
  * the function pointer CALL in struct k_clock.
  */
 
-static inline int common_clock_getres(const clockid_t which_clock,
-				      struct timespec *tp)
-{
-	tp->tv_sec = 0;
-	tp->tv_nsec = posix_clocks[which_clock].res;
-	return 0;
-}
-
 static int common_timer_create(struct k_itimer *new_timer)
 {
 	hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
@@ -984,18 +976,17 @@ SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
 SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
 		struct timespec __user *, tp)
 {
+	struct k_clock *kc = clockid_to_kclock(which_clock);
 	struct timespec rtn_tp;
 	int error;
 
-	if (invalid_clockid(which_clock))
+	if (!kc)
 		return -EINVAL;
 
-	error = CLOCK_DISPATCH(which_clock, clock_getres,
-			       (which_clock, &rtn_tp));
+	error = kc->clock_getres(which_clock, &rtn_tp);
 
-	if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) {
+	if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp)))
 		error = -EFAULT;
-	}
 
 	return error;
 }