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 <afd@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://lore.kernel.org/r/20230713200957.134480-1-afd@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -465,9 +465,12 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
 
 	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);