[PATCH] sun4i-timer: Only register a sched_clock on sun4i and sun5i

Hans de Goede
2015-03-21T14:45:57Z

sun6i and newer have an arm arch timer which is a better sched_clock source
then the sun4i-timer, and sched_clock does not have priorities, so do not
register the sun4i-timer sched_clock at all on sun6i and newer.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/clocksource/sun4i_timer.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index f4a9c00..1928a89 100644
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -170,7 +170,15 @@ static void __init sun4i_timer_init(struct device_node *node)
TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
timer_base + TIMER_CTL_REG(1));

- sched_clock_register(sun4i_timer_sched_read, 32, rate);
+ /*
+ * sched_clock_register does not have priorities, and on sun6i and
+ * later there is a better sched_clock registered by arm_arch_timer.c
+ */
+ if (of_machine_is_compatible("allwinner,sun4i-a10") ||
+ of_machine_is_compatible("allwinner,sun5i-a13") ||
+ of_machine_is_compatible("allwinner,sun5i-a10s"))
+ sched_clock_register(sun4i_timer_sched_read, 32, rate);
+
clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
rate, 350, 32, clocksource_mmio_readl_down);

--
2.3.3