phy: amlogic: phy-meson-axg-mipi-pcie-analog: Hold reference returned by of_get_parent()

As the of_get_parent() will increase the refcount of the node->parent
and the reference will be discarded, so we should hold the reference
with which we can decrease the refcount when done.

Fixes: 8eff8b4e ("phy: amlogic: phy-meson-axg-mipi-pcie-analog: add support for MIPI DSI analog")
Signed-off-by: Liang He <windhl@126.com>

Link: https://lore.kernel.org/r/20220915093506.4009456-1-windhl@126.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c

@@ -197,7 +197,7 @@ static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
 	struct phy_provider *phy;
 	struct device *dev = &pdev->dev;
 	struct phy_axg_mipi_pcie_analog_priv *priv;
-	struct device_node *np = dev->of_node;
+	struct device_node *np = dev->of_node, *parent_np;
 	struct regmap *map;
 	int ret;
 
@@ -206,7 +206,9 @@ static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* Get the hhi system controller node */
-	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
+	parent_np = of_get_parent(dev->of_node);
+	map = syscon_node_to_regmap(parent_np);
+	of_node_put(parent_np);
 	if (IS_ERR(map)) {
 		dev_err(dev,
 			"failed to get HHI regmap\n");