I've setup my DTB on ADRV9364Z7020 to allow switching of the reference clock to external ... what should I do now to toggle the gpio that controls it?

Please see here:

https://wiki.analog.com/resources/eval/user-guides/pzsdr/carriers/fmc#external_ad9361_reference_clock_via_j1

In this case the gpio-gate-clock driver owns the GPIO and nothing else can control it.

If you don't like that - remove the gate and use other techniques to control the GPIO from user space.

-Michael

Thank you Michael,

I might just do as you suggest and remove the GPIO control from the DTB and control the clock switching from user space. However, it would be nice to know how I can ask the  gpio-gate-clock driver to do the switching for me.

Is there as an attribute in sysfs that I could write into ... just as I can do for controlling attributes of ad9361-phy.

I've found the line { .compatible = "gpio-gate-clock" }, in linux\drivers\clk\clk-gpio.c ...

Kind regards
DrFlute