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@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, -- Hrishabh Rajput <hrishabh.rajput@xxxxxxxxxxxxxxxx>
