linux-kernel - [PATCH 0/2] Add support for Gunyah Watchdog

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Message-Id: <20250903-gunyah_watchdog-v1-0-3ae690530e4b@oss.qualcomm.com>
Date: Wed, 03 Sep 2025 19:33:58 +0000
From: Hrishabh Rajput via B4 Relay <devnull+hrishabh.rajput.oss.qualcomm.com@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Wim Van Sebroeck <wim@...ux-watchdog.org>, 
 Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-watchdog@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Hrishabh Rajput <hrishabh.rajput@....qualcomm.com>
Subject: [PATCH 0/2] Add support for Gunyah Watchdog

Gunyah is a Type-I hypervisor which was introduced in the patch series
[1]. It is an open source hypervisor. The source repo is available at
[2].

The Gunyah Hypervisor doesn't allow its Virtual Machines to directly
access the MMIO watchdog. It either provides the fully emulated MMIO
based watchdog interface or the SMC-based watchdog interface depending
on the hypervisor configuration.
The SMC-based watchdog follows ARM's SMC Calling Convention (SMCCC)
version 1.1 and uses Vendor Specific Hypervisor Service Calls space.

This patch series adds support for the SMC-based watchdog interface
provided by the Gunyah Hypervisor. The driver supports start/stop
operations, timeout and pretimeout configuration, pretimeout interrupt
handling and system restart via watchdog.

This series is tested on SM8750 platform.

[1]
https://lore.kernel.org/all/20240222-gunyah-v17-0-1e9da6763d38@quicinc.com/

[2]
https://github.com/quic/gunyah-hypervisor

Signed-off-by: Hrishabh Rajput <hrishabh.rajput@....qualcomm.com>
---
Hrishabh Rajput (2):
      dt-bindings: Add binding for gunyah watchdog
      watchdog: Add driver for Gunyah Watchdog

 .../bindings/watchdog/qcom,gh-watchdog.yaml        |  76 ++++++
 MAINTAINERS                                        |   3 +
 drivers/watchdog/Kconfig                           |  13 +
 drivers/watchdog/Makefile                          |   1 +
 drivers/watchdog/gunyah_wdt.c                      | 268 +++++++++++++++++++++
 include/linux/gunyah_errno.h                       |  77 ++++++
 6 files changed, 438 insertions(+)
---
base-commit: 038d61fd642278bab63ee8ef722c50d10ab01e8f
change-id: 20250903-gunyah_watchdog-2d2649438e29

Best regards,
-- 
Hrishabh Rajput <hrishabh.rajput@....qualcomm.com>