[PATCH V4] soc: imx8m: Unregister cpufreq and soc dev in cleanup path

[PATCH V4] soc: imx8m: Unregister cpufreq and soc dev in cleanup path

[Peng Fan (OSS)]

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

Unregister the cpufreq device and soc device when resource unwinding,
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")
Cc: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

V4:
 Check return value of cpufreq_dev

V3:
 Per Marco, drop remove function, use devm_add_action and update the patch
 title accordingly.

V2:
 Add err check when create the cpufreq platform device
 https://lore.kernel.org/all/20241217015826.1374497-1-peng.fan@oss.nxp.com/

 drivers/soc/imx/soc-imx8m.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
index 8ac7658e3d52..c65bcc6a1266 100644
--- a/drivers/soc/imx/soc-imx8m.c
+++ b/drivers/soc/imx/soc-imx8m.c
@@ -192,9 +192,20 @@ static __maybe_unused const struct of_device_id imx8_soc_match[] = {
 	devm_kasprintf((dev), GFP_KERNEL, "%d.%d", ((soc_rev) >> 4) & 0xf, (soc_rev) & 0xf) : \
 	"unknown"
 
+static void imx8m_unregister_soc(void *data)
+{
+	soc_device_unregister(data);
+}
+
+static void imx8m_unregister_cpufreq(void *data)
+{
+	platform_device_unregister(data);
+}
+
 static int imx8m_soc_probe(struct platform_device *pdev)
 {
 	struct soc_device_attribute *soc_dev_attr;
+	struct platform_device *cpufreq_dev;
 	const struct imx8_soc_data *data;
 	struct device *dev = &pdev->dev;
 	const struct of_device_id *id;
@@ -239,11 +250,22 @@ static int imx8m_soc_probe(struct platform_device *pdev)
 	if (IS_ERR(soc_dev))
 		return PTR_ERR(soc_dev);
 
+	ret = devm_add_action(dev, imx8m_unregister_soc, soc_dev);
+	if (ret)
+		return ret;
+
 	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);
+	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT)) {
+		cpufreq_dev = platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
+		if (IS_ERR(cpufreq_dev))
+			return dev_err_probe(dev, PTR_ERR(cpufreq_dev),
+					     "Failed to register imx-cpufreq-dev device\n");
+		ret = devm_add_action(dev, imx8m_unregister_cpufreq, cpufreq_dev);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
-- 
2.37.1

Re: [PATCH V4] soc: imx8m: Unregister cpufreq and soc dev in cleanup path

[Marco Felsch]

On 25-02-14, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Unregister the cpufreq device and soc device when resource unwinding,
> 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")
> Cc: Marco Felsch <m.felsch@pengutronix.de>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>

Re: [PATCH V4] soc: imx8m: Unregister cpufreq and soc dev in cleanup path

[Shawn Guo]

On Fri, Feb 14, 2025 at 04:47:51PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Unregister the cpufreq device and soc device when resource unwinding,
> 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")
> Cc: Marco Felsch <m.felsch@pengutronix.de>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

Applied, thanks!