soc: imx: gpc: de-register power domains only if initialized

If power domain information are missing in the device tree, no
power domains get initialized. However, imx_gpc_remove tries to
remove power domains always in the old DT binding case. Only
remove power domains when imx_gpc_probe initialized them in
first place.

Fixes: 721cabf6 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/soc/imx/gpc.c

@@ -470,13 +470,21 @@ static int imx_gpc_probe(struct platform_device *pdev)
 
 static int imx_gpc_remove(struct platform_device *pdev)
 {
+	struct device_node *pgc_node;
 	int ret;
 
+	pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
+
+	/* bail out if DT too old and doesn't provide the necessary info */
+	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
+	    !pgc_node)
+		return 0;
+
 	/*
 	 * If the old DT binding is used the toplevel driver needs to
 	 * de-register the power domains
 	 */
-	if (!of_get_child_by_name(pdev->dev.of_node, "pgc")) {
+	if (!pgc_node) {
 		of_genpd_del_provider(pdev->dev.of_node);
 
 		ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_PU].base);