Re: [PATCH RESEND v8 2/2] watchdog: Add driver for Gunyah Watchdog

[Kathiravan Thirumoorthy]

On 5/5/2026 8:56 AM, Pavan Kondeti wrote:
> On Thu, Apr 30, 2026 at 07:37:12AM -0700, Guenter Roeck wrote:
> > On 4/29/26 23:15, Pavan Kondeti wrote:
> > > On Mon, Mar 30, 2026 at 09:11:48AM -0500, Bjorn Andersson wrote:
> > > > On Wed, Mar 11, 2026 at 11:16:31AM +0530, Pavankumar Kondeti wrote:
> > > > > From: Hrishabh Rajput <hrishabh.rajput@xxxxxxxxxxxxxxxx>
> > > > >
> > > > > On Qualcomm SoCs running under the Gunyah hypervisor, access to watchdog
> > > > > through MMIO is not available on all platforms. Depending on the
> > > > > hypervisor configuration, the watchdog is either fully emulated or
> > > > > exposed via ARM's SMC Calling Conventions (SMCCC) through the Vendor
> > > > > Specific Hypervisor Service Calls space.
> > > > >
> > > > > Add driver to support the SMC-based watchdog provided by the Gunyah
> > > > > Hypervisor. Device registration is done in the QCOM SCM driver after
> > > > > checks to restrict the watchdog initialization to Qualcomm devices
> > > > > running under Gunyah.
> > > > >
> > > > > Gunyah watchdog is not a hardware but an SMC-based vendor-specific
> > > > > hypervisor interface provided by the Gunyah hypervisor. The design
> > > > > involving QCOM SCM driver for registering the platform device has been
> > > > > devised to avoid adding non-hardware nodes to devicetree.
> > > > >
> > > > > Tested-by: Shivendra Pratap <shivendra.pratap@xxxxxxxxxxxxxxxx>
> > > > > Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> > > > > Tested-by: Mukesh Ojha <mukesh.ojha@xxxxxxxxxxxxxxxx>
> > > > > Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> > > > > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
> > > > > Signed-off-by: Hrishabh Rajput <hrishabh.rajput@xxxxxxxxxxxxxxxx>
> > > > > Signed-off-by: Pavankumar Kondeti <pavan.kondeti@xxxxxxxxxxxxxxxx>
> > > > Guenter, there's no build-time dependency between the two patches. I'm
> > > > applying patch 1 through the qcom tree, please apply this patch through
> > > > the watchdog tree.
> > > Thanks Bjorn. I noticed that 1/2 is available in v7.1-rc1 , however 2/2
> > > is missing. Guenter, can you please pick it up for next release?
> > I don't send watchdog patches upstream; that has always been handled by Wim.
> >
> > Guenter
> Thanks Guenter for the reply.
>
> Wim,
>
> Can you please include this driver (2/2 PATCH) for the next release? Please let us
> know if I need to do anything else?

Pavan,

Please look at the announcement from the Guenter[1] and I see this 
change in the watchdog-next branch of Guenter's tree[2].

[1] 
https://lore.kernel.org/linux-watchdog/cc68acee-484b-4fa5-a3f3-6add81d63d22@xxxxxxxxxxxxxxxx/T/#m11e748ea57c88853b8bdc4e41cac08b7c1cd1b77

[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/log/?h=watchdog-next

Thanks,

Kathiravan T.

> Thanks,
> Pavan