phy: ti: gmii-sel: Allow parent to not be syscon node

If the parent node is not a syscon type, then fallback and check
if we can get a regmap from our own node. This no longer forces
us to make the parent of this node a syscon node when that might
not be appropriate.

Signed-off-by: Andrew Davis <[e-mail]>
Reviewed-by: Roger Quadros <[e-mail]>
Reviewed-by: Siddharth Vadapalli <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/ti/phy-gmii-sel.c

···
 
 	priv->regmap = syscon_node_to_regmap(node->parent);
 	if (IS_ERR(priv->regmap)) {
-		ret = PTR_ERR(priv->regmap);
-		dev_err(dev, "Failed to get syscon %d\n", ret);
-		return ret;
+		priv->regmap = device_node_to_regmap(node);
+		if (IS_ERR(priv->regmap)) {
+			ret = PTR_ERR(priv->regmap);
+			dev_err(dev, "Failed to get syscon %d\n", ret);
+			return ret;
+		}
 	}
 
 	ret = phy_gmii_sel_init_ports(priv);