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Thu, 6 Nov 2025 11:09:53 +0100 Received: from SAFDAG1NODE1.st.com (10.75.90.17) by EQNCAS1NODE4.st.com (10.75.129.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.57; Thu, 6 Nov 2025 11:17:12 +0100 Received: from [10.252.17.135] (10.252.17.135) by SAFDAG1NODE1.st.com (10.75.90.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.57; Thu, 6 Nov 2025 11:17:11 +0100 Message-ID: Date: Thu, 6 Nov 2025 11:17:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/5] Enable Remote GPIO over RPMSG on i.MX Platform To: Shenwei Wang , Peng Fan , "Bjorn Andersson" , Mathieu Poirier , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , "Shawn Guo" , Sascha Hauer , "Jonathan Corbet" , Linus Walleij , "Bartosz Golaszewski" CC: Pengutronix Kernel Team , Fabio Estevam , "linux-remoteproc@vger.kernel.org" , "devicetree@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , dl-linux-imx , Randy Dunlap , Andrew Lunn , "linux-gpio@vger.kernel.org" References: <20251104203315.85706-1-shenwei.wang@nxp.com> <05a0c630-3bd5-4307-8b94-1889ba191c33@foss.st.com> Content-Language: en-US From: Arnaud POULIQUEN In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Nov 2025 10:17:14.9745 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4f0b9171-d950-4481-aa7e-08de1d1da879 X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.44];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509EA.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR10MB3505 X-Proofpoint-ORIG-GUID: 2R9hU18N5EFlUZduFRlGv1sgGl6ujz7T X-Proofpoint-GUID: 2R9hU18N5EFlUZduFRlGv1sgGl6ujz7T X-Authority-Analysis: v=2.4 cv=QuRTHFyd c=1 sm=1 tr=0 ts=690c75ad cx=c_pps a=sVz80lr63r+noJKTyf6duQ==:117 a=Tm9wYGWyy1fMlzdxM1lUeQ==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=i8swKbHhBpcA:10 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s63m1ICgrNkA:10 a=KrXZwBdWH7kA:10 a=VkNPw1HP01LnGYTKEx00:22 a=8b9GpE9nAAAA:8 a=8AirrxEcAAAA:8 a=VwQbUJbxAAAA:8 a=KKAkSRfTAAAA:8 a=07d9gI8wAAAA:8 a=pGLkceISAAAA:8 a=JfrnYn6hAAAA:8 a=yGR9Ld5_Y51QbCr_SjcA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=T3LWEMljR5ZiDmsYVIUa:22 a=ST-jHhOKWsTCqRlWije3:22 a=cvBusfyB2V15izCimMoJ:22 a=e2CUPOnPG4QKp8I52DXD:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HhbK4dLum7pmb74im6QT:22 a=nl4s5V0KI7Kw-pW0DWrs:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA2MDA4MCBTYWx0ZWRfX5Bm0EnE1pnqB JLQPiKh2htH4p+6uucevcqem9AOINgeGS2CCxe2k7a7KdkfHEgs648p2tLjmlirRUwrglnNBKLU KQI3jrc5R/7s1l5Wr6+Pg/7/5AzA+LKOzNh2sqxCa+UdQ1JrXxGohviAo5bZumP3QO+MGD64psT xiUefgyGjxQElf6NGC14fQVNdB4twtWJ7PiLYiZDdRTPuh9/BjGoRxIf1+fBu1LP6ZhjTCgy4hj 4y414y4YB8oJK5dtEzhTN/7t22/pFl8XAgdDwN3F9rHdmxomF8inI8n4Ga1ZYZM8o+wo0/IozmA XRfNNbmRK7EBQJf4iyWy3n2JwvIrRTyMqfTVoCnpUchzbpBKvidPeAP2f53tsiq5xH7new6AYdK pAob8hmNuChmFqyI+VvvRjQakw1m9Q== 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=2025-11-06_02,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 spamscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 suspectscore=0 phishscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511060080 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251106_021745_137162_8439FC85 X-CRM114-Status: GOOD ( 16.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Shenwei, On 11/5/25 15:12, Shenwei Wang wrote: > Hi Arnaud, > >> -----Original Message----- >> From: Arnaud POULIQUEN >> Sent: Wednesday, November 5, 2025 4:26 AM >> To: Peng Fan ; Shenwei Wang ; >> Bjorn Andersson ; Mathieu Poirier >> ; Rob Herring ; Krzysztof >> Kozlowski ; Conor Dooley ; Shawn >> Guo ; Sascha Hauer ; >> Jonathan Corbet ; Linus Walleij ; >> Bartosz Golaszewski >> Cc: Pengutronix Kernel Team ; Fabio Estevam >> ; linux-remoteproc@vger.kernel.org; >> devicetree@vger.kernel.org; imx@lists.linux.dev; linux-arm- >> kernel@lists.infradead.org; linux-kernel@vger.kernel.org; linux- >> doc@vger.kernel.org; dl-linux-imx ; Randy Dunlap >> ; Andrew Lunn ; linux- >> gpio@vger.kernel.org >> Subject: [EXT] Re: [PATCH v5 0/5] Enable Remote GPIO over RPMSG on i.MX >> Platform >> Hi, >> >> On 11/5/25 02:12, Peng Fan wrote: >>> Hi Shenwei >>> >>>> Subject: [PATCH v5 0/5] Enable Remote GPIO over RPMSG on i.MX >>>> Platform >>>> >>>> Support the remote devices on the remote processor via the RPMSG bus >>>> on i.MX platform. >>>> >>> >>> I have not look into the details of new version, but before that, just >>> want to check, have we agreed on what Arnaud suggested? >>> or continue to proceed to be this as i.MX specific? >> >> Thanks, Peng, for pointing this out. Regarding the V3 discussions, it seems that I >> am not the only one suggesting a generic driver. >> > > As I mentioned before, the only i.MX-specific part is the transport protocol over the RPMSG bus. > In this v5 patches, we’ve included detailed documentation for the protocol in a separate file. Any > platform that follows the same protocol should work right out of the box. > > If you spot anything that could be improved, please let me know! My concerns remain the same as those shared previously: 1) The simpler one: gpio-imx-rpmsg.c should be renamed to gpio-rpmsg.c. 2) The more complex one: the driver should be independent of the remoteproc driver. The rpmsg protocol relies on virtio and can be used in contexts other than remoteproc. In other words, the struct rpmsg_driver and its associated operations should be defined within the rpmsg-gpio driver, not in the remoteproc driver. Thanks, Arnaud > > Thanks, > Shenwei > >> Thanks, >> Arnaud >> >>> >>> Thanks >>> Peng. >