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Fri, 10 Oct 2025 09:31:10 -0700 (PDT) Received: from p14s ([2604:3d09:148c:c800:ad30:d3d9:45c5:4a3]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29034f8f9bbsm61182205ad.121.2025.10.10.09.31.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Oct 2025 09:31:09 -0700 (PDT) Date: Fri, 10 Oct 2025 10:31:07 -0600 From: Mathieu Poirier To: Andrew Lunn Cc: Shenwei Wang , Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Linus Walleij , Bartosz Golaszewski , Pengutronix Kernel Team , Fabio Estevam , Peng Fan , 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-imx@nxp.com Subject: Re: [PATCH v3 3/4] gpio: imx-rpmsg: add imx-rpmsg GPIO driver Message-ID: References: <20251009222716.394806-1-shenwei.wang@nxp.com> <20251009222716.394806-4-shenwei.wang@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251010_093112_116185_76739C32 X-CRM114-Status: GOOD ( 18.33 ) 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 Fri, Oct 10, 2025 at 12:58:38AM +0200, Andrew Lunn wrote: > On Thu, Oct 09, 2025 at 05:27:15PM -0500, Shenwei Wang wrote: > > On i.MX SoCs, the system may include two processors: > > - An MCU running an RTOS > > - An MPU running Linux > > > > These processors communicate via the RPMSG protocol. > > The driver implements the standard GPIO interface, allowing > > the Linux side to control GPIO controllers which reside in > > the remote processor via RPMSG protocol. > > I've not seen the discussion on earlier versions of this patchset, so > i might be asking something already asked and answered. Sorry if i am. > > Is there anything IMX specific in here? This appears to be the first > RPMSG GPIO driver. Do we have the opportunity here to define a > protocol for all future RPMSG GPIO drivers, which any/all vendors > should follow, so we don't have lots of different implementations of > basically they same thing? So this would become gpio-rpmsg.c and a > Document somewhere describing the protocol? > I haven't looked at this patchset yet but I think Andrew's proposal has merit. > Andrew