This is my first patch submission to Linux so I apologise in advance for any mistakes. These changes were motivated by a pin conflict with the PCIe M.2 connector and the push buttons. As a result I decided go work through all 100 GPIO pins using the public board schematics. As I need to acquire a M.2 SSD to test the PCIe pin change that patch is not included in this series yet. Working though the pins I noticed a bug with with the MT7531 chip's reset line which was on the wrong GPIO. Since it was conflicting with the boot mode switch input GPIO pins I looked into ways to document the use of those pins with the switch. I ended up choosing a gpio-hog, but please let me know if there is a better alternative. I also added some missing pin groups for some of the built-in SoC devices to clearly document the use of those GPIO pins. I have actually written up a gpio-line-names list give all the pins names to match their usage on this board. If there is interest in this I can submit this as an additional patch. I see only some MT8xxx devices in the mediatek directory have a gpio-line-names so I wasn't sure if I should add it.
