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Mon, 04 May 2026 20:26:32 -0700 (PDT) Received: from hu-pkondeti-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b9cae59f57sm118554935ad.77.2026.05.04.20.26.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 May 2026 20:26:31 -0700 (PDT) Date: Tue, 5 May 2026 08:56:25 +0530 From: Pavan Kondeti To: Guenter Roeck Cc: Pavan Kondeti , Bjorn Andersson , Konrad Dybcio , Wim Van Sebroeck , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, Hrishabh Rajput , Shivendra Pratap , Neil Armstrong , Mukesh Ojha , Dmitry Baryshkov Subject: Re: [PATCH RESEND v8 2/2] watchdog: Add driver for Gunyah Watchdog Message-ID: <38fbf5da-abdd-4951-90d2-941f7cd62299@quicinc.com> References: <20260311-gunyah_watchdog-v8-0-4c1c0689de22@oss.qualcomm.com> <20260311-gunyah_watchdog-v8-2-4c1c0689de22@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-ORIG-GUID: -MskPVuw2MDyzaEeQMSJSlwDAQJhRRCL X-Authority-Analysis: v=2.4 cv=Z+vc2nRA c=1 sm=1 tr=0 ts=69f9636a cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=kj9zAlcOel0A:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=KKAkSRfTAAAA:8 a=_jlGtV7tAAAA:8 a=W9u3MqBc-PvxWcKrJdIA:9 a=CjuIK1q_8ugA:10 a=324X-CrmTo6CU4MGRt3R:22 a=cvBusfyB2V15izCimMoJ:22 a=nlm17XC03S6CtCLSeiRr:22 X-Proofpoint-GUID: -MskPVuw2MDyzaEeQMSJSlwDAQJhRRCL X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDAyOSBTYWx0ZWRfXwsI6M+rWHV2n UF7aLWQobVWkQTllIs5AVgIfzEdz9G8JQmePCXBtKgtUQ5EG88sYLRcKhceUlKkfThmbP9M60D5 o/a7DnF/4uOfCER3iQn4dH3ARn92Ty9XUzldyD+ni2v67gAoWK/Wj/kH6j2UUMgPPgiGXh4Utuw GVZw2PxXMa/vRgJcbK2OVWE2plOZCYtJHJ+CsPClZN7pGIp7AnZE7lxxUmo9jesYkA7idcJYjUW 0DMIbi9LjNiuwx55WdXRe7uRSXtY6IDZ7EZDz79GjEUoOrosaitmLPHy65tGo9fI8fA9ws2fTAB vejwu/EkN6YkUdSJ6CiMKXtTJNSDjNgoUA1lYG5anfeycLb0Pfb+WVbF81gR2EjcLvbvQxrAaTn 4WZyJdUMXyeyZ5DZ313tJXdBpctKsBxTa3dVp+ePHYRJ5VFTJYm+XDQyw6SVw/KE5FMmgrwADqP 47PDX3OcfNUXYMONF0w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_01,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 adultscore=0 impostorscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050029 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 > > > > > > > > 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 > > > > Tested-by: Neil Armstrong > > > > Tested-by: Mukesh Ojha > > > > Reviewed-by: Guenter Roeck > > > > Reviewed-by: Dmitry Baryshkov > > > > Signed-off-by: Hrishabh Rajput > > > > Signed-off-by: Pavankumar Kondeti > > > > > > 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