Hello! Many Single Board Computers (SBCs), especially those based on Rockchip SoCs, come with on-board buttons labeled "Recovery" (for entering some recovery mode) and "MaskROM" (for entering MaskROM mode for software flashing). These are usually GPIO-based keys or ADC attached resistor ladder buttons. When defining devicetrees for these boards, the current approaches include e.g. using "linux,code = <KEY_VENDOR>;", <KEY_SETUP>, <KEY_PROG2> or <BTN_1> if these butons are even defined in the devicetree source. So basically, there is no common approach currently, since a clearly defined key label is missing. The "linux,code" symbols used in the .dts files come from "include/uapi/linux/input-event-codes.h" which is included by "#include <dt-bindings/input/input.h>". Would it be a sensible approach to add two defines to input-event-codes.h e.g. KEY_RECOVERY and KEY_MASKROM (or a more generalized name)? Or is this out-of-scope for input-event-codes.h? Please let me know. Thanks! I can send a patch if I get green light :) In case you'd like to see examples of these buttons, you may have a look at devices like FriendlyElec NanoPC T6 [1] or Orange Pi 5 Plus [2]. Cheers, Sebastian [1] https://wiki.friendlyelec.com/wiki/index.php/NanoPC-T6 [2] http://www.orangepi.org/orangepiwiki/index.php/Orange_Pi_5_Plus
