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

[Andrew Lunn]

On Wed, Nov 12, 2025 at 04:31:52PM +0000, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Andrew Lunn <andrew at lunn.ch>
> > Sent: Wednesday, November 12, 2025 7:42 AM
> > To: Shenwei Wang <shenwei.wang at nxp.com>
> > Cc: Linus Walleij <linus.walleij at linaro.org>; Bjorn Andersson
> > <andersson at kernel.org>; Mathieu Poirier <mathieu.poirier at linaro.org>; Rob
> > Herring <robh at kernel.org>; Krzysztof Kozlowski <krzk+dt at kernel.org>; Conor
> > Dooley <conor+dt at kernel.org>; Shawn Guo <shawnguo at kernel.org>; Sascha
> > Hauer <s.hauer at pengutronix.de>; Jonathan Corbet <corbet at lwn.net>; Bartosz
> > Golaszewski <brgl at bgdev.pl>; Pengutronix Kernel Team
> > <kernel at pengutronix.de>; Fabio Estevam <festevam at gmail.com>; Peng Fan
> > <peng.fan at nxp.com>; linux-remoteproc at vger.kernel.org;
> > devicetree at vger.kernel.org; imx at lists.linux.dev; linux-arm-
> > kernel at lists.infradead.org; linux-kernel at vger.kernel.org; linux-
> > doc at vger.kernel.org; dl-linux-imx <linux-imx at nxp.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