From: Viresh Kumar <viresh.kumar@linaro.org>
Date: Mon, 29 Apr 2013 13:24:46 +0000 (+0000)
Subject: cpufreq: ARM big LITTLE DT: Return CPUFREQ_ETERNAL if clock-latency isn't found
X-Git-Tag: v3.12-rc1~785^2~1^2~17
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3c792e0fe17858105b72516f709c48fc8e4a7523;p=kernel%2Fkernel-generic.git

cpufreq: ARM big LITTLE DT: Return CPUFREQ_ETERNAL if clock-latency isn't found

If "/cpus" node isn't present or "clock-latency" isn't defined we are
returning error currently. Let's return CPUFREQ_ETERNAL instead, so
that we don't fail.

Flag appropriate messages to user in such cases.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c
index d5ae4d2..173ed05 100644
--- a/drivers/cpufreq/arm_big_little_dt.c
+++ b/drivers/cpufreq/arm_big_little_dt.c
@@ -66,8 +66,8 @@ static int dt_get_transition_latency(struct device *cpu_dev)
 
 	parent = of_find_node_by_path("/cpus");
 	if (!parent) {
-		pr_err("failed to find OF /cpus\n");
-		return -ENOENT;
+		pr_info("Failed to find OF /cpus. Use CPUFREQ_ETERNAL transition latency\n");
+		return CPUFREQ_ETERNAL;
 	}
 
 	for_each_child_of_node(parent, np) {
@@ -81,7 +81,8 @@ static int dt_get_transition_latency(struct device *cpu_dev)
 		return transition_latency;
 	}
 
-	return -ENODEV;
+	pr_info("clock-latency isn't found, use CPUFREQ_ETERNAL transition latency\n");
+	return CPUFREQ_ETERNAL;
 }
 
 static struct cpufreq_arm_bL_ops dt_bL_ops = {