[PATCH] i2c: designware-pci: Add CONFIG_PM_RUNTIME to i2c_dw_pci_runtime_idle()

[Jingoo Han <jg1.han-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>]

Add CONFIG_PM_RUNTIME to i2c_dw_pci_runtime_idle() to fix the
build warning when CONFIG_PM_RUNTIME is not selected. This is
because runtime PM callbacks defined by SET_RUNTIME_PM_OPS are
only used when the CONFIG_PM_RUNTIME is enabled.

drivers/i2c/busses/i2c-designware-pcidrv.c:188:12: warning: 'i2c_dw_pci_runtime_idle' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 drivers/i2c/busses/i2c-designware-pcidrv.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index f6ed06c..2b5d3a6 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -185,6 +185,7 @@ static int i2c_dw_pci_resume(struct device *dev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_RUNTIME
 static int i2c_dw_pci_runtime_idle(struct device *dev)
 {
 	int err = pm_schedule_suspend(dev, 500);
@@ -194,6 +195,7 @@ static int i2c_dw_pci_runtime_idle(struct device *dev)
 		return 0;
 	return -EBUSY;
 }
+#endif
 
 static const struct dev_pm_ops i2c_dw_pm_ops = {
 	.resume         = i2c_dw_pci_resume,
-- 
1.7.10.4