ADRV9361 ad9361_clk_sel in Linux

How do I change the ad9361_clk_sel line so that I can provide an external reference?

export 1011 > /sys/class/gpio/export provides a resource busy error.

reading from /sys/kernel/debug/gpio shows the ad9361_clk_sel and indicates that is being used by gpiochip0. Can I somehow set the gpio line through gpiochip0, if so how?

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