linux-kernel - Re: [PATCH v3 3/4] gpio: imx-rpmsg: add imx-rpmsg GPIO driver

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Message-ID: <eb99d9a8-eb96-445d-899a-6e1d9b6f6c69@lunn.ch>
Date: Fri, 10 Oct 2025 00:58:38 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Peng Fan <peng.fan@....com>,
	linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH v3 3/4] gpio: imx-rpmsg: add imx-rpmsg GPIO driver

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?

	Andrew