CC6UL-SBC access the signal "I/O expander AUD_PWR/IO28 signal"

Question

I have a ConnectCore6UL-SBC (development kit) and I want to
power-off the MAX98089 audio codec.
The ConnectCore6UL-SBC Hardware Ref. Manual, lists the
I/O expander AUD_PWR/IO28 signal, as the control for the
MAX98089 power switch.
Default state is power on and I want to power off !

Please tell me, where can I change the state of this
I/O expander AUD_PWR/IO28 signal in the device tree.

Further, can I change the state of this signals to runtime,
over /sys/class/gpio or similar ?


Thanks
cew

Answer 1

The GPIOs on the IO Expander are not supported yet. Digi is currently developing the firmware for this Kinetis chip. Then they need to work on a GPIO driver for Linux. Once this is ready, the IO Expander will appear as another GPIO controller in Linux, with a certain GPIO base number.
The user will be able to control these GPIOs just like any other GPIO in the system.

Answer 2

Hi Leonid

Thanks for the info.
When is the release of this firmware scheduled ?
Will the next release 5 for CC6UL support the IO expander ?

Have a nice weekend
cew

Comments

DEY-2.2 is expected end of April, beginning of May. It should support IO expander on the SBC. Please note that MCA GPIOs are already supported as of DEY-2.0-R5
https://www.digi.com/resources/documentation/digidocs/90001514/default.htm#reference/bsp/6ul/r_mca_gpio_6ul.htm?Highlight=gpio

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Hi Leonid

Will DEY-2.2 finally support the 4GB eMMC on the SBC ?
Will DEY-2.2 update Yocto from jethro to newer versions (morty) ?

cew