[PATCH] cpufreq: exynos: Convert exynos-cpufreq to platform driver

[PATCH] cpufreq: exynos: Convert exynos-cpufreq to platform driver

[Tomasz Figa]

From: Lukasz Majewski <l.majewski@samsung.com>

To make the driver multiplatform-friendly, unconditional initialization
in an initcall is replaced with a platform driver probed only if
respective platform device is registered.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 arch/arm/mach-exynos/common.c          |  5 +++++
 arch/arm/mach-exynos/common.h          |  1 +
 arch/arm/mach-exynos/mach-exynos4-dt.c |  1 +
 arch/arm/mach-exynos/mach-exynos5-dt.c |  1 +
 drivers/cpufreq/exynos-cpufreq.c       | 11 ++++++++++-
 5 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index c17407b..4414d70 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -305,6 +305,11 @@ void __init exynos_cpuidle_init(void)
 	platform_device_register(&exynos_cpuidle);
 }
 
+void __init exynos_cpufreq_init(void)
+{
+	platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
+}
+
 void __init exynos_init_late(void)
 {
 	if (of_machine_is_compatible("samsung,exynos5440"))
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index b2ac188..61e5f3a 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -23,6 +23,7 @@ void exynos_init_io(void);
 void exynos4_restart(enum reboot_mode mode, const char *cmd);
 void exynos5_restart(enum reboot_mode mode, const char *cmd);
 void exynos_cpuidle_init(void);
+void exynos_cpufreq_init(void);
 void exynos_init_late(void);
 
 void exynos_firmware_init(void);
diff --git a/arch/arm/mach-exynos/mach-exynos4-dt.c b/arch/arm/mach-exynos/mach-exynos4-dt.c
index 53a3dc3..2cbaf63 100644
--- a/arch/arm/mach-exynos/mach-exynos4-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos4-dt.c
@@ -26,6 +26,7 @@
 static void __init exynos4_dt_machine_init(void)
 {
 	exynos_cpuidle_init();
+	exynos_cpufreq_init();
 
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }
diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
index c9f7dd1..9144549 100644
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -48,6 +48,7 @@ static void __init exynos5_dt_machine_init(void)
 	}
 
 	exynos_cpuidle_init();
+	exynos_cpufreq_init();
 
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 0ef13e8..706570e 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -17,6 +17,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/cpufreq.h>
 #include <linux/suspend.h>
+#include <linux/platform_device.h>
 
 #include <plat/cpu.h>
 
@@ -277,4 +278,12 @@ err_vdd_arm:
 	kfree(exynos_info);
 	return -EINVAL;
 }
-late_initcall(exynos_cpufreq_init);
+
+static struct platform_driver exynos_cpufreq_platdrv = {
+	.driver = {
+		.name	= "exynos-cpufreq",
+		.owner	= THIS_MODULE,
+	},
+	.probe = exynos_cpufreq_init,
+};
+module_platform_driver(exynos_cpufreq_platdrv);
-- 
1.8.3.2

Re: [PATCH] cpufreq: exynos: Convert exynos-cpufreq to platform driver

[Sachin Kamat]

Hi Tomasz, Lukasz,

On 16 October 2013 21:30, Tomasz Figa <t.figa@samsung.com> wrote:
> From: Lukasz Majewski <l.majewski@samsung.com>
>
> +static struct platform_driver exynos_cpufreq_platdrv = {
> +       .driver = {
> +               .name   = "exynos-cpufreq",
> +               .owner  = THIS_MODULE,
> +       },
> +       .probe = exynos_cpufreq_init,

I think the prototype of this function should be changed to:
static int __init exynos_cpufreq_init(struct platform_device *pdev)

to avoid compilation warnings.

-- 
With warm regards,
Sachin

Re: [PATCH] cpufreq: exynos: Convert exynos-cpufreq to platform driver

[Jingoo Han]

On Thursday, October 17, 2013 2:00 PM, Sachin Kamat wrote:
> On 16 October 2013 21:30, Tomasz Figa <t.figa@samsung.com> wrote:
> > From: Lukasz Majewski <l.majewski@samsung.com>
> >
> > +static struct platform_driver exynos_cpufreq_platdrv = {
> > +       .driver = {
> > +               .name   = "exynos-cpufreq",
> > +               .owner  = THIS_MODULE,
> > +       },
> > +       .probe = exynos_cpufreq_init,
> 
> I think the prototype of this function should be changed to:
> static int __init exynos_cpufreq_init(struct platform_device *pdev)
> 
> to avoid compilation warnings.

Hi Tomasz Figa,

One more thing. :-)

It makes section mismatch warning. Also, module_platform_driver()
is used. Then, '__init' annotation can be removed in order to fix
the section mismatch warning.

static int exynos_cpufreq_init(struct platform_device *pdev)

Thank you.

Best regards,
Jingoo Han