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

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

[Hans de Goede]

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

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

[Maxime Ripard]

On Sat, Mar 21, 2015 at 03:45:57PM +0100, Hans de Goede wrote:
> 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>

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Thanks!

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20150322/e58e7b16/attachment.sig>