From: Tony Lindgren <tony@xxxxxxxxxxx>
[ Upstream commit 983a5a43ec254cd5ddf3254db80ca96e8f8bb2a4 ]
Commit 84badc5ec5fc ("ARM: dts: omap4: Move l4 child devices to probe
them with ti-sysc") moved some omap4 timers to probe with ti-sysc
interconnect target module. Turns out this broke pwm-omap-dmtimer
where we now try to reparent the clock to itself with the following:
omap_dm_timer_of_set_source: failed to set parent
With ti-sysc, we can now configure the clock sources in the dts
with assigned-clocks and assigned-clock-parents. So we should be able
to remove omap_dm_timer_of_set_source with clean-up patches later on.
But for now, let's just fix it first by checking if parent and fck
are the same and bail out of so.
Fixes: 84badc5ec5fc ("ARM: dts: omap4: Move l4 child devices to probe them with ti-sysc")
Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
Cc: Keerthy <j-keerthy@xxxxxx>
Cc: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Sebastian Reichel <sre@xxxxxxxxxx>
Cc: Tero Kristo <t-kristo@xxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reported-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
Tested-By: Andreas Kemnade <andreas@xxxxxxxxxxxx>
Tested-By: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/clocksource/timer-ti-dm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c
index 4cce6b224b87..3ecf84706640 100644
--- a/drivers/clocksource/timer-ti-dm.c
+++ b/drivers/clocksource/timer-ti-dm.c
@@ -154,6 +154,10 @@ static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
if (IS_ERR(parent))
return -ENODEV;
+ /* Bail out if both clocks point to fck */
+ if (clk_is_match(parent, timer->fclk))
+ return 0;
+
ret = clk_set_parent(timer->fclk, parent);
if (ret < 0)
pr_err("%s: failed to set parent\n", __func__);
--
2.19.1
