ARM / PXA: Use struct syscore_ops for "core" power management

Replace sysdev classes and struct sys_device objects used for "core"
power management by the PXA platform code with struct syscore_ops
objects that are simpler.

This reduces the code size and the kernel memory footprint.  It also
is necessary for removing sysdevs entirely from the kernel in the
future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 15 deletions

diff --git a/arch/arm/mach-pxa/lubbock.c b/arch/arm/mach-pxa/lubbock.c
index 3ede978c83d9..e10ddb827147 100644
--- a/arch/arm/mach-pxa/lubbock.c
+++ b/arch/arm/mach-pxa/lubbock.c
@@ -15,7 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/major.h>
 #include <linux/fb.h>
 #include <linux/interrupt.h>
@@ -176,31 +176,22 @@ static void __init lubbock_init_irq(void)
 
 #ifdef CONFIG_PM
 
-static int lubbock_irq_resume(struct sys_device *dev)
+static void lubbock_irq_resume(void)
 {
         LUB_IRQ_MASK_EN = lubbock_irq_enabled;
-        return 0;
 }
 
-static struct sysdev_class lubbock_irq_sysclass = {
-        .name = "cpld_irq",
+static struct syscore_ops lubbock_irq_syscore_ops = {
         .resume = lubbock_irq_resume,
 };
 
-static struct sys_device lubbock_irq_device = {
-        .cls = &lubbock_irq_sysclass,
-};
-
 static int __init lubbock_irq_device_init(void)
 {
-        int ret = -ENODEV;
-
         if (machine_is_lubbock()) {
-                ret = sysdev_class_register(&lubbock_irq_sysclass);
-                if (ret == 0)
-                        ret = sysdev_register(&lubbock_irq_device);
+                register_syscore_ops(&lubbock_irq_syscore_ops);
+                return 0;
         }
-        return ret;
+        return -ENODEV;
 }
 
 device_initcall(lubbock_irq_device_init);