linux-kernel - [PATCH v3 2/2] ACPI: PNP: Add Intel OC Watchdog IDs to non-PNP device list

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Message-Id: <20250317-ivo-intel_oc_wdt-v3-2-32c396f4eefd@siemens.com>
Date: Mon, 17 Mar 2025 10:55:07 +0000
From: Diogo Ivo <diogo.ivo@...mens.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
 Wim Van Sebroeck <wim@...ux-watchdog.org>, 
 Guenter Roeck <linux@...ck-us.net>
Cc: linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, 
 linux-watchdog@...r.kernel.org, jan.kiszka@...mens.com, 
 benedikt.niedermayr@...mens.com, Diogo Ivo <diogo.ivo@...mens.com>
Subject: [PATCH v3 2/2] ACPI: PNP: Add Intel OC Watchdog IDs to non-PNP
 device list

Intel Over-Clocking Watchdogs are described in ACPI tables by both the
generic PNP0C02 _CID and their ACPI _HID. The presence of the _CID then
causes the PNP scan handler to attach to the watchdog, preventing the
actual watchdog driver from binding. Address this by adding the ACPI
_HIDs to the list of non-PNP devices, so that the PNP scan handler is
bypassed.

Note that these watchdogs can be described by multiple _HIDs for what
seems to be identical hardware. This commit is not a complete list of
all the possible watchdog ACPI _HIDs.

Signed-off-by: Diogo Ivo <diogo.ivo@...mens.com>
---
v2->v3:
 - Reword the commit message to clarify purpose of patch
---
---
 drivers/acpi/acpi_pnp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c
index 01abf26764b00c86f938dea2ed138424f041f880..3f5a1840f573303c71f5d579e32963a5b29d2587 100644
--- a/drivers/acpi/acpi_pnp.c
+++ b/drivers/acpi/acpi_pnp.c
@@ -355,8 +355,10 @@ static bool acpi_pnp_match(const char *idstr, const struct acpi_device_id **matc
  * device represented by it.
  */
 static const struct acpi_device_id acpi_nonpnp_device_ids[] = {
+	{"INT3F0D"},
 	{"INTC1080"},
 	{"INTC1081"},
+	{"INTC1099"},
 	{""},
 };

-- 
2.48.1