RockPro64 pwmfan0 on NetBSD10.0_BETA couldn't get 'cooling-levels' property

[joelp%sdf.org@localhost]

I'm running NetBSD10.0_BETA daily (June 7th) on a RockPro64. In my dmesg:

[     1.000004] pwmfan0 at simplebus0autoconfiguration error: : couldn't
get 'cooling-levels' property

In src/sys/dev/fdt/pwm_fan.c

    levels = fdtbus_get_prop(phandle, "cooling-levels", &len);
    if (len < 4) {
        aprint_error(": couldn't get 'cooling-levels' property\n");
        return;
    }

This leaves the CPU cooling fan off, unfortunately. I did have the fan
running on NetBSD9.3.

Any options to get at least the fan running at some constant speed?

Thanks.