linux-kernel - [PATCH 4.14 116/496] soc: imx: gpc: de-register power domains only if initialized

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Date:   Mon, 28 May 2018 11:58:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Agner <stefan@...er.ch>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 116/496] soc: imx: gpc: de-register power domains only if initialized

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Agner <stefan@...er.ch>

[ Upstream commit 7801c545e706674aeed40256eb806ad37b18ad71 ]

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: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Stefan Agner <stefan@...er.ch>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
Reviewed-by: Fabio Estevam <fabio.estevam@....com>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/soc/imx/gpc.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -456,13 +456,21 @@ static int imx_gpc_probe(struct platform
 
 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);