[meta-intel] GPIO functionality for Intel E3845 CPU (valley-island, bay-trail)

[Henrik Haugaard Jensen]

We have successfully used meta-intel jethro branch for our device based on an intel E3845 CPU.

Now we need to upgrade to a newer Linux kernel to get full camera/video/media support. But when building new BSP with sumo or rocko branches it turn out that pinctrl/GPIO system is not working neither with linux-intel 4.9 or 4.14.

Baytrail pin-controller support and GPIO support seems to be configured for the kernel out of the box, but after booting "/sys/kernel/debug/gpio" is empty and the pin-controller gpio-chip's is not showing in "/sys/class/gpio".

Doing initcall debugging shows that "bxt_pinctrl_init" (Broxton ) is called and not "byt_gpio_init" (Baytrail) - I have tried, but not been able, to find out why.

I have tried both vanilla meta-intel sumo BSP and  "ROCKO 2.4 - BAY TRAIL BSP" (meta-intel branch 8.1-rocko-2.4.2) - what is going wrong?

Also I have the impression that since linux 4.8 the "/sys/class/gpio" user interface is obsolete and apparently replaced by /dev/gpioxxx pin devices and a new gpiolib userspace tool for this has been provided. Has this new GPIO interface made its way into meta-intel?

Regards,
Henrik Haugaard Jensen
TrackMan

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