From ac696b0176b485933ca73d8cab01946d07efa988 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Tue, 22 Jan 2019 09:03:08 -0800 Subject: clocksource: timer-ti-dm: Fix pwm dmtimer usage of fck reparenting [ 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 Cc: Daniel Lezcano Cc: H. Nikolaus Schaller Cc: Keerthy Cc: Ladislav Michl Cc: Pavel Machek Cc: Sebastian Reichel Cc: Tero Kristo Cc: Thierry Reding Cc: Thomas Gleixner Reported-by: H. Nikolaus Schaller Tested-By: Andreas Kemnade Tested-By: H. Nikolaus Schaller Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- drivers/clocksource/timer-ti-dm.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/clocksource') 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__); -- cgit v1.2.3