linux-kernel - [PATCH] soc: imx8m: Add remove function

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Message-Id: <20241206112843.98720-1-peng.fan@oss.nxp.com>
Date: Fri,  6 Dec 2024 19:28:43 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: shawnguo@...nel.org,
	s.hauer@...gutronix.de
Cc: kernel@...gutronix.de,
	festevam@...il.com,
	marex@...x.de,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Peng Fan <peng.fan@....com>
Subject: [PATCH] soc: imx8m: Add remove function

From: Peng Fan <peng.fan@....com>

Unregister the cpufreq device and soc device in remove path, otherwise
there will be warning when do removing test:
sysfs: cannot create duplicate filename '/devices/platform/imx-cpufreq-dt'
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.13.0-rc1-next-20241204
Hardware name: NXP i.MX8MPlus EVK board (DT)

Fixes: 9cc832d37799 ("soc: imx8m: Probe the SoC driver as platform driver")
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/soc/imx/soc-imx8m.c | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
index 8ac7658e3d52..8c368947d1e5 100644
--- a/drivers/soc/imx/soc-imx8m.c
+++ b/drivers/soc/imx/soc-imx8m.c
@@ -33,6 +33,11 @@ struct imx8_soc_data {
 	int (*soc_revision)(u32 *socrev, u64 *socuid);
 };
 
+struct imx8m_soc_priv {
+	struct soc_device *soc_dev;
+	struct platform_device *cpufreq_dev;
+};
+
 #ifdef CONFIG_HAVE_ARM_SMCCC
 static u32 imx8mq_soc_revision_from_atf(void)
 {
@@ -198,7 +203,7 @@ static int imx8m_soc_probe(struct platform_device *pdev)
 	const struct imx8_soc_data *data;
 	struct device *dev = &pdev->dev;
 	const struct of_device_id *id;
-	struct soc_device *soc_dev;
+	struct imx8m_soc_priv *priv;
 	u32 soc_rev = 0;
 	u64 soc_uid = 0;
 	int ret;
@@ -207,6 +212,10 @@ static int imx8m_soc_probe(struct platform_device *pdev)
 	if (!soc_dev_attr)
 		return -ENOMEM;
 
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
 	soc_dev_attr->family = "Freescale i.MX";
 
 	ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
@@ -235,21 +244,34 @@ static int imx8m_soc_probe(struct platform_device *pdev)
 	if (!soc_dev_attr->serial_number)
 		return -ENOMEM;
 
-	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR(soc_dev))
-		return PTR_ERR(soc_dev);
+	priv->soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR(priv->soc_dev))
+		return PTR_ERR(priv->soc_dev);
 
 	pr_info("SoC: %s revision %s\n", soc_dev_attr->soc_id,
 		soc_dev_attr->revision);
 
 	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
-		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
+		priv->cpufreq_dev = platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
+
+	platform_set_drvdata(pdev, priv);
 
 	return 0;
 }
 
+static void imx8m_soc_remove(struct platform_device *pdev)
+{
+	struct imx8m_soc_priv *priv = platform_get_drvdata(pdev);
+
+	if (!IS_ERR(priv->cpufreq_dev))
+		platform_device_unregister(priv->cpufreq_dev);
+
+	soc_device_unregister(priv->soc_dev);
+}
+
 static struct platform_driver imx8m_soc_driver = {
 	.probe = imx8m_soc_probe,
+	.remove	= imx8m_soc_remove,
 	.driver = {
 		.name = "imx8m-soc",
 	},
-- 
2.37.1