net: ethernet: ti: am65-cpsw-nuss: use of_platform_device_create() for mdio

The MCU CPSW expected to populate only MDIO device, but follow up patches
will add "compatible" property to the MCU CPSW CPTS node which will cause
creation of CPTS device and MCU CPSW init failure. Hence, switch to use
of_platform_device_create() instead of of_platform_populate() for MDIO
device population.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -2031,10 +2031,21 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
-	/* We do not want to force this, as in some cases may not have child */
-	if (ret)
-		dev_warn(dev, "populating child nodes err:%d\n", ret);
+	node = of_get_child_by_name(dev->of_node, "mdio");
+	if (!node) {
+		dev_warn(dev, "MDIO node not found\n");
+	} else if (of_device_is_available(node)) {
+		struct platform_device *mdio_pdev;
+
+		mdio_pdev = of_platform_device_create(node, NULL, dev);
+		if (!mdio_pdev) {
+			ret = -ENODEV;
+			goto err_pm_clear;
+		}
+
+		common->mdio_dev =  &mdio_pdev->dev;
+	}
+	of_node_put(node);
 
 	am65_cpsw_nuss_get_ver(common);
 
@@ -2090,7 +2101,8 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 	return 0;
 
 err_of_clear:
-	of_platform_depopulate(dev);
+	of_platform_device_destroy(common->mdio_dev, NULL);
+err_pm_clear:
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 	return ret;
@@ -2115,7 +2127,7 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev)
 	 */
 	am65_cpsw_nuss_cleanup_ndev(common);
 
-	of_platform_depopulate(dev);
+	of_platform_device_destroy(common->mdio_dev, NULL);
 
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

drivers/net/ethernet/ti/am65-cpsw-nuss.h

@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
+#include <linux/platform_device.h>
 
 struct am65_cpts;
 
@@ -76,6 +77,7 @@ struct am65_cpsw_pdata {
 
 struct am65_cpsw_common {
 	struct device		*dev;
+	struct device		*mdio_dev;
 	const struct am65_cpsw_pdata *pdata;
 
 	void __iomem		*ss_base;