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gpio: imx-scu: add imx-scu GPIO driver

Steve Best requested to merge sfbest/centos-stream-9:2184172 into main

Bugzilla: http://bugzilla.redhat.com/2184172

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=51940461

Tested: Did sanity testing on (nxp-imx8mquad-01.edge1) system.

commit 0bd459ddf9e4f1af3ee3148eb319d1f8747f02ba Author: Shenwei Wang shenwei.wang@nxp.com Date: Fri Aug 12 08:30:12 2022 -0500

gpio: imx-scu: add imx-scu GPIO driver

The SCU firmware on i.MX8 platforms provides a set of APIs to
control the GPIO PINs on the SCU domain. This patch implements the
standard GPIO driver interface to access those PINs on the
SCU domain over the SCU APIs.

Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

Signed-off-by: Steve Best sbest@redhat.com

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