cpufreq: cpufreq-dt: extend with platform_data

This commit extends the cpufreq-dt driver to take a platform_data
structure. This structure is for now used to tell the cpufreq-dt
driver the layout of the clocks on the platform, i.e whether all CPUs
share the same clock or whether each CPU has a separate clock.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 6bbb8b913446bf4ce7131c4fb9448db2ac7721c3..52facdaf531e06e5da44c4fcbdbc32b1f59db85e 100644 (file)
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -18,6 +18,7 @@
 #include <linux/cpu.h>
 #include <linux/cpu_cooling.h>
 #include <linux/cpufreq.h>
+#include <linux/cpufreq-dt.h>
 #include <linux/cpumask.h>
 #include <linux/err.h>
 #include <linux/module.h>
@@ -178,6 +179,7 @@ try_again:
 
 static int cpufreq_init(struct cpufreq_policy *policy)
 {
+       struct cpufreq_dt_platform_data *pd;
        struct cpufreq_frequency_table *freq_table;
        struct thermal_cooling_device *cdev;
        struct device_node *np;
@@ -265,9 +267,18 @@ static int cpufreq_init(struct cpufreq_policy *policy)
        policy->driver_data = priv;
 
        policy->clk = cpu_clk;
-       ret = cpufreq_generic_init(policy, freq_table, transition_latency);
-       if (ret)
+       ret = cpufreq_table_validate_and_show(policy, freq_table);
+       if (ret) {
+               dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
+                       ret);
                goto out_cooling_unregister;
+       }
+
+       policy->cpuinfo.transition_latency = transition_latency;
+
+       pd = cpufreq_get_driver_data();
+       if (pd && !pd->independent_clocks)
+               cpumask_setall(policy->cpus);
 
        of_node_put(np);
 
@@ -335,6 +346,8 @@ static int dt_cpufreq_probe(struct platform_device *pdev)
        if (!IS_ERR(cpu_reg))
                regulator_put(cpu_reg);
 
+       dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
+
        ret = cpufreq_register_driver(&dt_cpufreq_driver);
        if (ret)
                dev_err(cpu_dev, "failed register driver: %d\n", ret);

diff --git a/include/linux/cpufreq-dt.h b/include/linux/cpufreq-dt.h
new file mode 100644 (file)
index 0000000..0414009
--- /dev/null
+++ b/include/linux/cpufreq-dt.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2014 Marvell
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __CPUFREQ_DT_H__
+#define __CPUFREQ_DT_H__
+
+struct cpufreq_dt_platform_data {
+       /*
+        * True when each CPU has its own clock to control its
+        * frequency, false when all CPUs are controlled by a single
+        * clock.
+        */
+       bool independent_clocks;
+};
+
+#endif /* __CPUFREQ_DT_H__ */