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Tue, 5 May 2026 11:13:10 -0500 Message-ID: <9a249ea8-5279-4698-a93f-2e91e2b8bf8f@ti.com> Date: Tue, 5 May 2026 21:43:09 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 3/4] gpio: rpmsg: add generic rpmsg GPIO driver To: , Arnaud POULIQUEN , Mathieu Poirier CC: Shenwei Wang , Andrew Lunn , "Linus Walleij" , Bartosz Golaszewski , "Jonathan Corbet" , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Frank Li , Sascha Hauer , Shuah Khan , "linux-gpio@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "Pengutronix Kernel Team" , Fabio Estevam , "Peng Fan" , "devicetree@vger.kernel.org" , "linux-remoteproc@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , dl-linux-imx , Bartosz Golaszewski References: <20260422212849.1240591-1-shenwei.wang@nxp.com> <6412a758-4560-4cf1-a0d0-5b24d1a715f1@lunn.ch> <6e01e114-e336-4744-b6b4-563ec42e321b@lunn.ch> <472f85bd-42c2-40c6-abfd-b76924797069@ti.com> <21de8440-adf7-454b-acfc-06e50882e075@ti.com> <4c526816-b127-43e7-86e9-eee4dc1152bc@foss.st.com> <4b622824-0073-4c6a-8525-248bd484c3f0@ti.com> Content-Language: en-US From: "Padhi, Beleswar" In-Reply-To: Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Z0IuSX4riiF10GzL7WzJnGD/UKZvkWBk3hS1RFv9iFi0zXuiVlPi80OoDUlgEhg5VesXwKlTgRGp5a2WBgl3CBmtyy7DfUsJw9pY3U4Ca85fDFUw56Pv+rib9PwYtrVb14d4g5HflCGFwauXifdjmG4mOx/nrJiNM5WNlDleAEBmMNv0V7HcwlUQJ6Br4cnrcE+IRN6ZxIHykTM2Xico5jJfcHsJpsuF6maoowg+93e9iD/6zNhgxPM/2lXuyV4gz2YRo0mo1qYr7IScgYNskgA9tLim/3cdrome/nSuDEHa7AjhvSExcus45Ttlihh0DmGbDb0EYlwN8RuPFCiAS/0zMidenEirpp9HZQ49aVsAOXJYr9yVWJu44yMcY6CBrNZejPoRmcnpGa/kgfk6T5qruFqmqPTnx0WjMHLXgxzoFxyUNwe1z+4tB9LNMsWv X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 16:13:28.5464 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0595e92-5529-458e-fae6-08deaac13e76 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.195];Helo=[flwvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00021F68.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR10MB7638 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260505_091345_953984_2424A863 X-CRM114-Status: GOOD ( 15.39 ) 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 On 5/5/2026 9:08 PM, Shah, Tanmay wrote: [...] > >>> If there are >>> multiple or multiple instances of same controller, than we need separate >>> channel name for that controller just like we would have separate device >>> on the Linux. >> >> Why so? I think there is some confusion in the terminology: >> >> GPIO controller = GPIO port (gpio@xyz) defined in the >> Device tree = struct rpmsg_gpio_port in code >> >> GPIO line = Individual lines within each GPIO port (max = >> GPIOS_PER_PORT_DEFAULT) = struct rpmsg_gpio_line in code >> > Okay, I understand now. So, same gpio controller has multiple instances. > >>>>>>>> 1. namespace/channel#1 = rpmsg-io >>>>>>>> a. ept1 -> gpio-controller@1 >>>>>>>> b. ept2 -> gpio-controller@2 > So, In that case above mentioned approach doesn't work. > > Because, this approach is mapping endpoint to the gpio-controller. And what is the problem with that? > From > linux's perspective, it needs to map rpmsg *channel* to the > gpio-controller not the endpoint. Can you explain why it *needs* to? > > To be more specific: > > Linux: remote: > > ch1: rpmsg-gpio.-1.1024 -> gpio-controller@1024 > - gpio-line ept1 > - gpio-line ept2 -> They all map to same callback_ept_1024. > - gpio-line ept3 This is a weird mapping. I am not suggesting one ept per gpio-line, rather one per gpio-controller. You can refer my detailed proposal here: https://lore.kernel.org/all/268f8e00-91bc-43ea-ba95-077cf859e7f3@ti.com/ > > ch2: rpmsg-gpio.-1.1025 -> gpio-controller@1025 > - gpio-line ept1 > - gpio-line ept2 -> They all map to same callback_ept_1025. > - gpio-line ept3 [...] > > On the remote side, we have to hardcode Which rpmsg controller is mapped > to which endpoint. Not necessarily, we can exchange this info at runtime. Thanks, Beleswar