clocksource: clksrc-of: Warn if no clock sources are found

Many platforms rely on clocksource_of_init() being implicitly
called for registering clock sources and will get zero warnings
if no working clock source is available. Let's print a critical
error message if no clock source is found.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c
index 35639cf4e5a2..a30b42c3ac3b 100644
--- a/drivers/clocksource/clksrc-of.c
+++ b/drivers/clocksource/clksrc-of.c
@@ -28,6 +28,7 @@ void __init clocksource_of_init(void)
         struct device_node *np;
         const struct of_device_id *match;
         clocksource_of_init_fn init_func;
+        unsigned clocksources = 0;
 
         for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
                 if (!of_device_is_available(np))
@@ -36,5 +37,8 @@ void __init clocksource_of_init(void)
                 init_func = match->data;
                 init_func(np);
                 of_node_put(np);
+                clocksources++;
         }
+        if (!clocksources)
+                pr_crit("%s: no matching clocksources found\n", __func__);
 }