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Mon, 25 May 2026 02:34:32 -0700 (PDT) X-Received: by 2002:a05:6a00:3c6c:b0:841:a0c8:6e9c with SMTP id d2e1a72fcca58-841a0c8731dmr1853810b3a.26.1779701671783; Mon, 25 May 2026 02:34:31 -0700 (PDT) Received: from [10.219.57.229] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84164fd80cdsm10474835b3a.49.2026.05.25.02.34.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 May 2026 02:34:31 -0700 (PDT) Message-ID: Date: Mon, 25 May 2026 15:04:20 +0530 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v22 08/13] mfd: core: Add firmware-node support to MFD cells To: Bartosz Golaszewski , Lee Jones Cc: Sebastian Reichel , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Daniel Lezcano , Christian Loehle , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Arnd Bergmann , Souvik Chakravarty , Andy Yan , Matthias Brugger , John Stultz , Moritz Fischer , Sudeep Holla , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Florian Fainelli , Krzysztof Kozlowski , Dmitry Baryshkov , Mukesh Ojha , Andre Draszik , Greg Kroah-Hartman , Kathiravan Thirumoorthy , Srinivas Kandagatla , Bartosz Golaszewski References: <20260514-arm-psci-system_reset2-vendor-reboots-v22-0-28a5bde07483@oss.qualcomm.com> <20260514-arm-psci-system_reset2-vendor-reboots-v22-8-28a5bde07483@oss.qualcomm.com> <20260521112638.GD2921053@google.com> <20260521132419.GA3591266@google.com> <20260521162705.GH3591266@google.com> Content-Language: en-US From: Shivendra Pratap In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTI1MDA5NyBTYWx0ZWRfX3CRBO3MLTgfI Q5zZFc7jwAPlowoeyYlW+Gscu/drmP59CF9WJCCmxH330Unm9uN8jccIE+GuQPUGnHidouS+pEU 82/9q9t1o6WkBezZJBJWzU+mEOeSkROkQMBWr2JZZSgENT7y3LcFeS4ahrWZ2qCBOSwOuM5oT1G igJ7JLgKRtY+QlqdfuRIl6udrnmqtg5W+gplH7bXML9mFbNXpk+Piahj+APIojFsxL31rtXnY/w 0szRrB9zTGVBtwL2vsu0quEnFu/8XWKnFOTU9B48J1BJGsd+myyX6J3Oej1BcYOKOCf3EKWvoqP Bsv+wHqo8Fyx0r0jXM0jBoiVtd2RWO0wpQyIfdieHrVYJKJdeRi3zP/FgaQew3QSYBLNjgm054X SmSz/rWS5RA3mJvdSUsw2S17420dYq7y9gS+X1q5MjWR/XhtFS9I9LF3H5e6HInJTfq1DtopUWL O3OLN/kG7BQpSyPQkIA== X-Proofpoint-ORIG-GUID: CXotDR1LDfbWlCvkpsniVL5MFcqpEsBN X-Authority-Analysis: v=2.4 cv=cN3QdFeN c=1 sm=1 tr=0 ts=6a1417a9 cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=VwQbUJbxAAAA:8 a=VqCRv7ZaHuqyx2qM4PwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-GUID: CXotDR1LDfbWlCvkpsniVL5MFcqpEsBN 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=2026-05-25_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605250097 On 22-05-2026 14:38, Bartosz Golaszewski wrote: > On Thu, May 21, 2026 at 6:27 PM Lee Jones wrote: >> >> On Thu, 21 May 2026, Bartosz Golaszewski wrote: >> >>> On Thu, May 21, 2026 at 3:24 PM Lee Jones wrote: >>>> >>>>> >>>>> I suggested it because of its flexibility. The alternative I had in >>>>> mind is something like a new field in mfd_cell: >>>>> >>>>> const char *cell_node_name; >>>>> >>>>> Which - if set - would tell MFD to look up an fwnode that's a child of >>>>> the parent device's node by name - as it may not have a compatible. >>>> >>>> Remind me why the chlid device can't look-up its own fwnode? >>>> >>> >>> Oh sure it can, but should it? I'm not sure it's logically sound to >>> have the child device reach into the parent, look up the fwnode and >>> then assign it to itself after it's already attached to the driver. >>> This should be done at the subsystem level before the device is >>> registered. >> >> Leaf drivers reach back into the parent all the time. >> > > But drivers don't generally assign firmware nodes to devices they are > already bound to. This is racy as in probe() the device is already > visible to the system. There's no synchronization of device property > access - properties are assumed to be read-only for a registered > device. thanks Bart/Lee. Any pointers to take this from here? thanks, Shivendra