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cpufreq: arm_big_little_dt: Instantiate as platform_driver

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As multiplatform build is being adopted by more and more ARM platforms, initcall
function should be used very carefully. For example, when both arm_big_little_dt
and cpufreq-cpu0 drivers are compiled in, arm_big_little_dt driver may try to
register even if we had platform device for cpufreq-cpu0 registered.

To eliminate this undesired the effect, the patch changes arm_big_little_dt
driver to have it instantiated as a platform_driver. Then it will only run on
platforms that create the platform_device "arm-bL-cpufreq-dt".

Reported-and-tested-by: Rob Herring <robherring2@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2013-05-20 09:57:17 +05:30 committed by Rafael J. Wysocki
parent 92a9b5c291
commit 9076eaca60
1 changed files with 15 additions and 5 deletions
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20
drivers/cpufreq/arm_big_little_dt.c
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@ -26,6 +26,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/opp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "arm_big_little.h"
@ -95,7 +96,7 @@ static struct cpufreq_arm_bL_ops dt_bL_ops = {
.init_opp_table = dt_init_opp_table,
};
static int generic_bL_init(void)
static int generic_bL_probe(struct platform_device *pdev)
{
struct device_node *np;
@ -106,13 +107,22 @@ static int generic_bL_init(void)
of_node_put(np);
return bL_cpufreq_register(&dt_bL_ops);
}
module_init(generic_bL_init);
static void generic_bL_exit(void)
static int generic_bL_remove(struct platform_device *pdev)
{
return bL_cpufreq_unregister(&dt_bL_ops);
bL_cpufreq_unregister(&dt_bL_ops);
return 0;
}
module_exit(generic_bL_exit);
static struct platform_driver generic_bL_platdrv = {
.driver = {
.name = "arm-bL-cpufreq-dt",
.owner = THIS_MODULE,
},
.probe = generic_bL_probe,
.remove = generic_bL_remove,
};
module_platform_driver(generic_bL_platdrv);
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");