gpio: Add Phytium GPIO driver

[hhhui-L]

This patch introduces a driver for Phytium GPIO controller.

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[opsiff]

/ok-to-test

[opsiff]

/ok-to-test
/lgtm

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Phytium GPIO: Add support for Phytium GPIO platform

This patch adds support for Phytium GPIO platform. The GPIO
controller on Phytium platform has been designed with a simple
and flexible architecture, which allows for easy extension of
functionality. The GPIO driver for Phytium platform is designed
to work with this architecture.

The GPIO driver provides a set of functions to interact with
the GPIO controller, including reading and writing GPIO pins,
configuring the direction of GPIO pins, and handling GPIO interrupts.

To enable the GPIO driver for Phytium platform, the following steps
should be taken:

1. Compile the GPIO driver as a module.

2. Load the compiled driver using the 'modprobe' command or
   by adding the driver to '/etc/modules'.

3. Configure the GPIO controller on the Phytium platform by setting
   the appropriate registers using the 'devmem' tool or by modifying
   the 'gpio-phytium-platform.c' file directly.

4. Create a platform device node for the GPIO controller on the Phytium
   platform using the 'of_platform_init' function in the 'of' module.

5. Register the platform driver with the Linux kernel by adding the
   driver to '/lib/modules/<kernel_version>/build/include/linux/module.h'
   and '/etc/modprobe.d/phytium_gpio.conf'.

6. Enable the GPIO driver in the Linux kernel by adding the following
   line to '/etc/modules':

   gpio-phytium-platform
   

7. Reboot the system for the changes to take effect.

This patch adds support for Phytium GPIO platform by providing the
necessary driver and platform device node. It also includes the
required configuration for the GPIO controller and platform driver.