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ChromiumOS's vboot_reference tooling [1] provides convenient access to various firmware and hardware details via its `crossystem` tool. crossystem currently: (1) relies on the v1 GPIO cdev API to read GPIOs; and (2) expects gpio-line-names properties. Enable the kernel config, and document a few pins for Google WiFi devices. I only go so far as to pull two relevant names out of the vendor device tree. Others could perhaps be backfilled if the info is available and useful. [1] https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/HEAD/README Signed-off-by: Brian Norris <computersforpeace@gmail.com> Link: https://github.com/openwrt/openwrt/pull/16014 Signed-off-by: Robert Marko <robimarko@gmail.com>