Hi, I've been adding support for the PC Engines APU5 board, which is a variant of the APU 2-4 boards with some nice features. The current platform driver for pcengines boards has some redundant features with regards to recent bios/firmware packages for the board as they now set the ACPI tables to indicate GPIOs for keys and leds. So I've submitted a patch to eliminate this. It could be argued that it's useful to support older firmware versions, but there is also a 'leds-apu' driver which a) probably ought to be marked deprecated with a view to removing it and b) implements the leds even on antique firmware versions. In implementing the APU5 I changed some of the exported gpio names to make them more closely match functionality across all the boards. For example APU2 vs APU4 both support 2x LTE options, but in different mpcie slots and this affects the numbering of options, but not the sense of them (so I renamed them based on the intention of the option). This is particularly true on APU5 which supports 3x LTE cards Can I get some advice: It would be helpful if the kernel would export the GPIOs to user-space automatically since toggling SIM slots is fairly useful task in userspace. At least for me the gpio numbers seem to jump around depending on the order of module loading, so doing something involving /sys/class/gpio/export isn't obviously an easy process. Reviewing the fine documentation suggests that I need to use gpio_export() to achieve this, but I concede I'm really not clear how to implement this in the platform module as currently structured... Any tips please? Thanks Ed W
