[PATCH v4 2/5] usb: ehci-exynos: Use DEFINE_SIMPLE_DEV_PM_OPS for PM functions

[Anand Moon <linux.amoon@gmail.com>]

Use DEFINE_SIMPLE_DEV_PM_OPS macro to progressively switch from a code
model where PM callbacks are all protected behind CONFIG_PM guards,
to a code model where the PM callbacks are always seen by the compiler,
but discarded if not used.

Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
v4: rephrase commit message
    add reviewed by RB Alan Stern

v3: fix using new DEFINE_SIMPLE_DEV_PM_OPS PM macro hence
    change the $subject and the commit message

v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM
        is disabled.
---
 drivers/usb/host/ehci-exynos.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index e2303757bc0f..f40bc2a7a124 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -237,7 +237,6 @@ static void exynos_ehci_remove(struct platform_device *pdev)
 	usb_put_hcd(hcd);
 }
 
-#ifdef CONFIG_PM
 static int exynos_ehci_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
@@ -280,15 +279,9 @@ static int exynos_ehci_resume(struct device *dev)
 	ehci_resume(hcd, false);
 	return 0;
 }
-#else
-#define exynos_ehci_suspend	NULL
-#define exynos_ehci_resume	NULL
-#endif
 
-static const struct dev_pm_ops exynos_ehci_pm_ops = {
-	.suspend	= exynos_ehci_suspend,
-	.resume		= exynos_ehci_resume,
-};
+static DEFINE_SIMPLE_DEV_PM_OPS(exynos_ehci_pm_ops,
+				exynos_ehci_suspend, exynos_ehci_resume);
 
 #ifdef CONFIG_OF
 static const struct of_device_id exynos_ehci_match[] = {
@@ -304,7 +297,7 @@ static struct platform_driver exynos_ehci_driver = {
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver = {
 		.name	= "exynos-ehci",
-		.pm	= &exynos_ehci_pm_ops,
+		.pm	= pm_ptr(&exynos_ehci_pm_ops),
 		.of_match_table = of_match_ptr(exynos_ehci_match),
 	}
 };
-- 
2.44.0