ARM: EXYNOS: convert cpuidle driver to be a platform driver

ARM EXYNOS cpuidle driver is currently not multiplatform support
ready (as it uses device_initcall() for initialization and doesn't
check on what platform it is running). Fix it by converting the
driver to be a platform driver and registering exynos_cpuidle
platform device from exynos[4,5]_dt_machine_init().

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

5 files changed, 28 insertions, 2 deletions

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index ba95e5db2501..c17407b16d7c 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -30,6 +30,7 @@
 #include <linux/clk-provider.h>
 #include <linux/irqchip/arm-gic.h>
 #include <linux/irqchip/chained_irq.h>
+#include <linux/platform_device.h>
 
 #include <asm/proc-fns.h>
 #include <asm/exception.h>
@@ -294,6 +295,16 @@ void exynos5_restart(enum reboot_mode mode, const char *cmd)
         __raw_writel(val, addr);
 }
 
+static struct platform_device exynos_cpuidle = {
+        .name           = "exynos_cpuidle",
+        .id             = -1,
+};
+
+void __init exynos_cpuidle_init(void)
+{
+        platform_device_register(&exynos_cpuidle);
+}
+
 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 8646a141ae46..b2ac1885d381 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -22,6 +22,7 @@ struct map_desc;
 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_init_late(void);
 
 void exynos_firmware_init(void);
diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c
index ac139226d63c..1bde6ad07d93 100644
--- a/arch/arm/mach-exynos/cpuidle.c
+++ b/arch/arm/mach-exynos/cpuidle.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/export.h>
 #include <linux/time.h>
+#include <linux/platform_device.h>
 
 #include <asm/proc-fns.h>
 #include <asm/smp_scu.h>
@@ -192,7 +193,7 @@ static void __init exynos5_core_down_clk(void)
         __raw_writel(tmp, EXYNOS5_PWR_CTRL2);
 }
 
-static int __init exynos4_init_cpuidle(void)
+static int __init exynos_cpuidle_probe(struct platform_device *pdev)
 {
         int cpu_id, ret;
         struct cpuidle_device *device;
@@ -226,4 +227,13 @@ static int __init exynos4_init_cpuidle(void)
 
         return 0;
 }
-device_initcall(exynos4_init_cpuidle);
+
+static struct platform_driver exynos_cpuidle_driver = {
+        .probe  = exynos_cpuidle_probe,
+        .driver = {
+                .name = "exynos_cpuidle",
+                .owner = THIS_MODULE,
+        },
+};
+
+module_platform_driver(exynos_cpuidle_driver);
diff --git a/arch/arm/mach-exynos/mach-exynos4-dt.c b/arch/arm/mach-exynos/mach-exynos4-dt.c
index 0099c6c13bba..53a3dc37a730 100644
--- a/arch/arm/mach-exynos/mach-exynos4-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos4-dt.c
@@ -25,6 +25,8 @@
 
 static void __init exynos4_dt_machine_init(void)
 {
+        exynos_cpuidle_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 f874b773ca13..c9f7dd1cdc8f 100644
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -47,6 +47,8 @@ static void __init exynos5_dt_machine_init(void)
                 }
         }
 
+        exynos_cpuidle_init();
+
         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }