[PATCH v12 3/5] gpio: rpmsg: add generic rpmsg GPIO driver

[Shenwei Wang]

Hi Bjorn,

> -----Original Message-----
> From: Shenwei Wang
> Sent: Friday, March 13, 2026 2:59 PM
> To: Linus Walleij <linusw at kernel.org>; Bartosz Golaszewski <brgl at kernel.org>;
> Jonathan Corbet <corbet at lwn.net>; Rob Herring <robh at kernel.org>; Krzysztof
> Kozlowski <krzk+dt at kernel.org>; Conor Dooley <conor+dt at kernel.org>; Bjorn
> Andersson <andersson at kernel.org>; Mathieu Poirier
> <mathieu.poirier at linaro.org>; Frank Li <frank.li at nxp.com>; Sascha Hauer
> <s.hauer at pengutronix.de>; arnaud.pouliquen at foss.st.com
> Cc: Shuah Khan <skhan at linuxfoundation.org>; linux-gpio at vger.kernel.org; linux-
> doc at vger.kernel.org; linux-kernel at vger.kernel.org; Pengutronix Kernel Team
> <kernel at pengutronix.de>; Fabio Estevam <festevam at gmail.com>; Shenwei
> Wang <shenwei.wang at nxp.com>; Peng Fan <peng.fan at nxp.com>;
> devicetree at vger.kernel.org; linux-remoteproc at vger.kernel.org;
> imx at lists.linux.dev; linux-arm-kernel at lists.infradead.org; dl-linux-imx <linux-
> imx at nxp.com>; Bartosz Golaszewski <brgl at bgdev.pl>; Andrew Lunn
> <andrew at lunn.ch>
> Subject: [PATCH v12 3/5] gpio: rpmsg: add generic rpmsg GPIO driver
> 

Since I rewrote this version based on your earlier feedback 
---
"My expectation is that it will be better to just have two separate
drivers - but reuse all the design-work done in the gpio-virtio."
---
I'd glad to hear what you think about this patch.

Thanks,
Shenwei

> On an AMP platform, 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.
> 
> Cc: Bartosz Golaszewski <brgl at bgdev.pl>
> Cc: Andrew Lunn <andrew at lunn.ch>
> Signed-off-by: Shenwei Wang <shenwei.wang at nxp.com>
> ---
>  drivers/gpio/Kconfig      |  17 ++
>  drivers/gpio/Makefile     |   1 +
>  drivers/gpio/gpio-rpmsg.c | 596 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 614 insertions(+)
>  create mode 100644 drivers/gpio/gpio-rpmsg.c
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index
> b45fb799e36c..cff0fda8a283 100644