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

[Neil Armstrong]

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@xxxxxxxxxxx/
>
> [2]
> https://github.com/quic/gunyah-hypervisor
>
> Signed-off-by: Hrishabh Rajput <hrishabh.rajput@xxxxxxxxxxxxxxxx>
> ---
> 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,