linux-kernel - [PATCH 12/20] clocksource: clksrc-of: Warn if no clock sources are found

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Message-Id: <1388398779-11222-12-git-send-email-daniel.lezcano@linaro.org>
Date:	Mon, 30 Dec 2013 11:19:31 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	mingo@...nel.org, tglx@...utronix.de
Cc:	axel.lin@...ics.com, ezequiel.garcia@...e-electrons.com,
	jg1.han@...sung.com, laurent.pinchart+renesas@...asonboard.com,
	linus.walleij@...aro.org, maxime.ripard@...e-electrons.com,
	michael.opdenacker@...e-electrons.com, sboyd@...eaurora.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 12/20] clocksource: clksrc-of: Warn if no clock sources are found

From: Linus Walleij <linus.walleij@...aro.org>

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@...aro.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/clksrc-of.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c
index 35639cf4..a30b42c 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__);
 }
-- 
1.7.9.5

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