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Wed, 29 Apr 2026 08:41:50 -0700 (PDT) Date: Wed, 29 Apr 2026 09:41:46 -0600 From: Mathieu Poirier To: Shenwei Wang Cc: Andrew Lunn , "Padhi, Beleswar" , 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 Subject: Re: [PATCH v13 3/4] gpio: rpmsg: add generic rpmsg GPIO driver Message-ID: References: <20260422212849.1240591-1-shenwei.wang@nxp.com> <20260422212849.1240591-4-shenwei.wang@nxp.com> <22fb5fac-2568-42be-a7e3-7e89d0017eb3@ti.com> <6412a758-4560-4cf1-a0d0-5b24d1a715f1@lunn.ch> <6e01e114-e336-4744-b6b4-563ec42e321b@lunn.ch> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Apr 28, 2026 at 03:24:59PM +0000, Shenwei Wang wrote: > > > > -----Original Message----- > > From: Andrew Lunn > > Sent: Monday, April 27, 2026 3:49 PM > > To: Shenwei Wang > > Cc: Padhi, Beleswar ; Linus Walleij ; > > Bartosz Golaszewski ; Jonathan Corbet ; > > Rob Herring ; Krzysztof Kozlowski ; > > Conor Dooley ; Bjorn Andersson > > ; Mathieu Poirier ; 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 > > Subject: [EXT] Re: [PATCH v13 3/4] gpio: rpmsg: add generic rpmsg GPIO driver > > > > struct virtio_gpio_response { > > > > __u8 status; > > > > __u8 value; > > > > }; > > > > > It is the same message format. Please see the message definition > > (GET_DIRECTION) below: > > > > > + +-----+-----+-----+-----+-----+----+ > > > + |0x00 |0x01 |0x02 |0x03 |0x04 |0x05| > > > + | 1 | 2 |port |line | err | dir| > > > + +-----+-----+-----+-----+-----+----+ > > > > Sorry, but i don't see how two u8 vs six u8 are the same message format. > > > > Some changes to the message format are necessary. > > Virtio uses two communication channels (virtqueues): one for requests and replies, and a second one for events. > In contrast, rpmsg provides only a single communication channel, so a type field is required to distinguish between > different kinds of messages. > > Since rpmsg replies and events share the same message format, an additional line is introduced to handle both cases. > > Finally, rpmsg supports multiple GPIO controllers, so a port field is added to uniquely identify the target controller. I have commented on this before - RPMSG is already providing multiplexing capability by way of endpoints. There is no need for a port field. One endpoint, one GPIO controller. > > Shenwei > > > Andrew