linux-kernel - [PATCH 1/2] cpufreq-dt: check CPU clock/power domain during initializing

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Date:	Fri,  9 Jan 2015 17:54:50 +0800
From:	"pi-cheng.chen" <pi-cheng.chen@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	"pi-cheng.chen" <pi-cheng.chen@...aro.org>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mike Turquette <mturquette@...aro.org>,
	linaro-kernel@...ts.linaro.org,
	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>
Subject: [PATCH 1/2] cpufreq-dt: check CPU clock/power domain during initializing

Currently the DT based cpufreq driver is missing some way to check which
CPUs share clocks. In the 1st patch, CPU clock/power domain information is
added to the platform_data of cpufreq-dt so that cpufreq-dt driver could
check which CPUs share clock/power.

Signed-off-by: pi-cheng.chen <pi-cheng.chen@...aro.org>
---
 drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
 include/linux/cpufreq-dt.h   |  6 ++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index fde97d6..ff8c266 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -296,6 +296,21 @@ static int cpufreq_init(struct cpufreq_policy *policy)
 	pd = cpufreq_get_driver_data();
 	if (!pd || !pd->independent_clocks)
 		cpumask_setall(policy->cpus);
+	else if (pd && !list_empty(&pd->domain_list)) {
+		struct list_head *domain_node;
+
+		list_for_each(domain_node, &pd->domain_list) {
+			struct cpufreq_cpu_domain *domain;
+
+			domain = container_of(domain_node,
+					      struct cpufreq_cpu_domain, node);
+			if (!cpumask_test_cpu(policy->cpu, &domain->cpus))
+				continue;
+
+			cpumask_copy(policy->cpus, &domain->cpus);
+			break;
+		}
+	}
 
 	of_node_put(np);
 
diff --git a/include/linux/cpufreq-dt.h b/include/linux/cpufreq-dt.h
index 0414009..92bffd3 100644
--- a/include/linux/cpufreq-dt.h
+++ b/include/linux/cpufreq-dt.h
@@ -10,6 +10,11 @@
 #ifndef __CPUFREQ_DT_H__
 #define __CPUFREQ_DT_H__
 
+struct cpufreq_cpu_domain {
+	struct list_head node;
+	cpumask_t cpus;
+};
+
 struct cpufreq_dt_platform_data {
 	/*
 	 * True when each CPU has its own clock to control its
@@ -17,6 +22,7 @@ struct cpufreq_dt_platform_data {
 	 * clock.
 	 */
 	bool independent_clocks;
+	struct list_head domain_list;
 };
 
 #endif /* __CPUFREQ_DT_H__ */
-- 
1.9.1

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