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

[Pavan Kondeti <pavan.kondeti@oss.qualcomm.com>]

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@oss.qualcomm.com>
> > > > 
> > > > 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@oss.qualcomm.com>
> > > > Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
> > > > Tested-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
> > > > Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> > > > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> > > > Signed-off-by: Hrishabh Rajput <hrishabh.rajput@oss.qualcomm.com>
> > > > Signed-off-by: Pavankumar Kondeti <pavan.kondeti@oss.qualcomm.com>
> > > 
> > > 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?

Thanks,
Pavan