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dm: timer: handle being called before dm_root is ready

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When used with bootstage recording, dm_timer_init may be called
surprisingly early: i.e. before dm_root is ready. To deal with
this case, we explicitly check for this condition and return
-EAGAIN to the caller (refer to drivers/timer/rockchip_timer.c
for a case where this is needed/used).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2017-09-11 22:04:11 +02:00
parent b61e8b0c9e
commit af82315164
1 changed files with 7 additions and 0 deletions
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7
drivers/timer/timer-uclass.c
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@ -92,6 +92,13 @@ int notrace dm_timer_init(void)
if (gd->timer)
return 0;
/*
* Directly access gd->dm_root to suppress error messages, if the
* virtual root driver does not yet exist.
*/
if (gd->dm_root == NULL)
return -EAGAIN;
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
/* Check for a chosen timer to be used for tick */
node = ofnode_get_chosen_node("tick-timer");