[PATCH net-next] net: davinci_mdio: fix building error without CONFIG_OF

[YueHaibing <yuehaibing@huawei.com>]

gcc report a build error when compiling without CONFIG_OF
drivers/net/ethernet/ti/davinci_mdio.c: In function ‘davinci_mdio_probe’:
drivers/net/ethernet/ti/davinci_mdio.c:380:9: error: implicit declaration of function ‘davinci_mdio_probe_dt’ [-Werror=implicit-function-declaration]
   ret = davinci_mdio_probe_dt(&data->pdata, pdev);
         ^
Fixes: 9eae9c7d0875 ("drivers: net: davinci_mdio: enable pm runtime auto for ti cpsw-mdio")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/ti/davinci_mdio.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 8ac7283..6e544d9 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -339,9 +339,7 @@ static int davinci_mdio_probe_dt(struct mdio_platform_data *data,
 
 	return 0;
 }
-#endif
 
-#if IS_ENABLED(CONFIG_OF)
 static const struct davinci_mdio_of_param of_cpsw_mdio_data = {
 	.autosuspend_delay_ms = 100,
 };
@@ -352,6 +350,12 @@ static const struct of_device_id davinci_mdio_of_mtable[] = {
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, davinci_mdio_of_mtable);
+#else
+static int davinci_mdio_probe_dt(struct mdio_platform_data *data,
+				 struct platform_device *pdev)
+{
+	return -EINVAL;
+}
 #endif
 
 static int davinci_mdio_probe(struct platform_device *pdev)
-- 
2.7.0