Add driver for the RK3328 GPIO_MUTE pin

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Summary

This is used in in the ROC-RK3328-CC to control a regulator.

Test Plan

Tested on ROC-RK3328-CC board

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• Fix copyright

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• Fix copyright and update wrapping

[ziaee]

I don't know what this does, but thank you for writing a manual with it! Some minor style suggestions and questions:

share/man/man4/man4.aarch64/rk_grf_gpio.4

2

The project this - was added for was abandoned

3

You could use SPDX only now if you want, there's an example in style(9)

31

This is more than one line. How's this? The rendered line barely fits on standard console.

38

Does it support the gpio or only the gpio_mute pin?
How can people use it? What does it do? That would be really nice in this section.

41–44

53

I see no reason why we couldn't, but we don't usually say "device driver" lately.

58

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• Address manual feedback

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share/man/man4/man4.aarch64/rk_grf_gpio.4

31

Should be better now (certainly shorter)

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• was->were

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• Another typo, CPIO -> GPIO

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• Update .c file per style(9) as well.

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• Remove unneeded headers