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+What: /sys/bus/spi/<dev>/update_firmware
+Date: Jul 2021
+Contact: sebastian.reichel@collabora.com
+Description: Write 1 to this file to update the ACHC microcontroller
+ firmware via the EzPort interface. For this the kernel
+ will load "achc.bin" via the firmware API (so usually
+ from /lib/firmware). The write will block until the FW
+ has either been flashed successfully or an error occurred.
+
+What: /sys/bus/spi/<dev>/reset
+Date: Jul 2021
+Contact: sebastian.reichel@collabora.com
+Description: This file represents the microcontroller's reset line.
+ 1 means the reset line is asserted, 0 means it's not
+ asserted. The file is read and writable.