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

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Message-ID: <a3af076b-ca0b-4d5e-8294-2bf5a9814959@linaro.org>
Date: Thu, 4 Sep 2025 09:13:23 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: hrishabh.rajput@....qualcomm.com, 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
Subject: Re: [PATCH 0/2] Add support for Gunyah Watchdog

On 03/09/2025 21:33, Hrishabh Rajput via B4 Relay wrote:
> 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.

Would this driver work on older platforms like SM8550 & SM8650 ?

Thanks,
Neil

> 
> [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,