linux-kernel - Re: [PATCH v5 3/5] docs: staging: gpio-rpmsg: gpio over rpmsg bus

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Message-ID: <1b39ba56-e38c-4661-9973-b56fdaa1bcae@lunn.ch>
Date: Fri, 14 Nov 2025 18:39:03 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	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>,
	Jonathan Corbet <corbet@....net>,
	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" <linux-remoteproc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v5 3/5] docs: staging: gpio-rpmsg: gpio over rpmsg bus

On Wed, Nov 12, 2025 at 04:31:52PM +0000, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Andrew Lunn <andrew@...n.ch>
> > Sent: Wednesday, November 12, 2025 7:42 AM
> > To: Shenwei Wang <shenwei.wang@....com>
> > Cc: Linus Walleij <linus.walleij@...aro.org>; 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>; Jonathan Corbet <corbet@....net>; 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-
> > doc@...r.kernel.org; dl-linux-imx <linux-imx@....com>
> > Subject: [EXT] Re: [PATCH v5 3/5] docs: staging: gpio-rpmsg: gpio over rpmsg bus
> > 
> > Since this has not been merged yet, there are no existing systems.
> > 
> 
> In this context, "system" refers to both Linux and the remote firmware. The remote firmware 
> for i.MX platforms has already been released and widely used by our customers. Maintaining 
> compatibility with the existing firmware would provide a better solution for customers.

>From what i understand, this is not just GPIO. There is also I2C? And
RTC? I would expect a generic implementation of these as well? I find
it unlikely you can persuade all these subsystem Maintainers to accept
your protocols as is. You need to make changes so that GPIOs
interrupts work correctly, so i would just accept you need to change
the firmware. And i've given you a way you can keep backwards
compatible to your out of tree driver...

	  Andrew