linux-kernel - [PATCH] platform/x86: portwell-ec: Move watchdog device under correct platform hierarchy

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Message-Id: <20250613082614.28929-1-ivan.hu@canonical.com>
Date: Fri, 13 Jun 2025 16:26:14 +0800
From: Ivan Hu <ivan.hu@...onical.com>
To: hdegoede@...hat.com,
	jesse.huang@...twell.com.tw,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ivan.hu@...onical.com
Subject: [PATCH] platform/x86: portwell-ec: Move watchdog device under correct platform hierarchy

Without explicitly setting a parent for the watchdog device, the device is
registered with a NULL parent. This causes device_add() (called internally
by devm_watchdog_register_device()) to register the device under
/sys/devices/virtual, since no parent is provided. The result is:

DEVPATH=/devices/virtual/watchdog/watchdog0

To fix this, assign &pdev->dev as the parent of the watchdog device before
calling devm_watchdog_register_device(). This ensures the device is
associated with the Portwell EC platform device and placed correctly in
sysfs as:

DEVPATH=/devices/platform/portwell-ec/watchdog/watchdog0

This aligns the device hierarchy with expectations and avoids misplacement
under the virtual class.

Signed-off-by: Ivan Hu <ivan.hu@...onical.com>
---
 drivers/platform/x86/portwell-ec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/x86/portwell-ec.c b/drivers/platform/x86/portwell-ec.c
index 8b788822237b..3e019c51913e 100644
--- a/drivers/platform/x86/portwell-ec.c
+++ b/drivers/platform/x86/portwell-ec.c
@@ -236,6 +236,7 @@ static int pwec_probe(struct platform_device *pdev)
 		return ret;
 	}

+	ec_wdt_dev.parent = &pdev->dev;
 	ret = devm_watchdog_register_device(&pdev->dev, &ec_wdt_dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register Portwell EC Watchdog\n");
-- 
2.34.1