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Wed, 05 Nov 2025 04:11:49 -0800 (PST) Received: from hu-pkondeti-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29601a60ef0sm59997125ad.83.2025.11.05.04.11.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Nov 2025 04:11:49 -0800 (PST) Date: Wed, 5 Nov 2025 17:41:43 +0530 From: Pavan Kondeti To: Pavan Kondeti Cc: Bjorn Andersson , Hrishabh Rajput , Konrad Dybcio , Wim Van Sebroeck , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong , Dmitry Baryshkov Subject: Re: [PATCH v4 1/2] soc: qcom: smem: Register gunyah watchdog device Message-ID: <729d0806-0f92-45a3-ae36-307513f8b808@quicinc.com> References: <20251031-gunyah_watchdog-v4-0-7abb1ee11315@oss.qualcomm.com> <20251031-gunyah_watchdog-v4-1-7abb1ee11315@oss.qualcomm.com> <40a6395e-26f6-4bad-88af-d89479b6fc28@oss.qualcomm.com> <599188b5-cd2e-4667-a91d-04cbdd62cecb@quicinc.com> <2ef1d795-5cdd-4465-9333-16a02207a806@quicinc.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: <2ef1d795-5cdd-4465-9333-16a02207a806@quicinc.com> X-Proofpoint-ORIG-GUID: VY7UkwC7DLoZaaW5-2hLffxKQfNK-smY X-Proofpoint-GUID: VY7UkwC7DLoZaaW5-2hLffxKQfNK-smY X-Authority-Analysis: v=2.4 cv=MK1tWcZl c=1 sm=1 tr=0 ts=690b3f07 cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=kj9zAlcOel0A:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=v0qggLAlYnFivbKH520A:9 a=CjuIK1q_8ugA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDA5MiBTYWx0ZWRfX2J9rMc5P2m/w BHEDI7bXYl9XnK5S5SET1eWeTajddsj8Qjsb3f/GHpeLX5AgbLDsLD3jszr4M2P4w/lkJHjbBBo rq1UZr/AAGAhaT5I1WNpxvbO5OJDx7TEl/BM/Og9LexwM3YBHXewuVZTulOxEi/g3+OpNptoN+u h7eMk3znla3ASxGm7GmsDpTK3CU9FIsLLhLL5h79qxaQNTmV+uIpldJ5SpYNm4lJtE/hOx2pmBR fR6GZkfwGI/ISSzdQlDCa6kf+HbBUftj/Tra5Jxv2zfhLVPUqSy1I1NUihOzkcrrmGmMfkx6xcC QgrR5Rj++6mddNot/UKf6GtvCo70sTDjVrs11ImGtsT/3Mt2YpbifSgx5AnpbVM45T/hDOPvUQ3 B+0eBdOdwglg5ECoh4E8Hv8xOTkOkQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-05_04,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 bulkscore=0 clxscore=1015 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511050092 On Tue, Nov 04, 2025 at 10:33:52AM +0530, Pavan Kondeti wrote: > > > I presume if we determine that Gunyah is present, and we haven't put > > sbsa wdt in place (e.g. during bringup) Gunyah and Gunyah WDT will > > handle the outcome gracefully... > > > Yes, we are told Gunyah support SMCC based WDT even if it emulates > SBSA. Most importantly, we have STATUS SMC in gunyah-wdt probe before > registering the watchdog device. > Thanks Bjorn for asking this question. I have tested this scenario on Kaanapali. Since the initial platform support patches have added watchdog device, I don't see gunyah-wdt platform device created. When I removed the node, I see gunyah-wdt platform device is created and the driver is probed successfully. Since this patch checks the device node presence via of_find_compatible_node(), it does not cover the case where the node is present but marked as disabled/reserved etc. I think it would be good to add of_device_is_available() check as well to cover this case. Thanks, Pavan