Well, following up on my own post in case anyone finds this useful...
I just tried deleting all references to mcasp{0,1} in
/boot/am335x-boneblack.dts and on reboot, the pins that I wanted free are
indeed free. This gives me
P8:
name pin mode 6 mode 5
P8_11 13 out:0:r30:15
P8_12 12 out:0:r30:14
P8_15 15 in:0:r31:15
P8_16 14 in:0:r31:14
P9:
P9_24 97 in:0:r31:16
P9_26 96 in:1:r31:16
P9_27 105 in:0:r31:5 out:0:r30:5
P9_30 102 in:0:r31:2 out:0:r30:2
P9_41 106 in:0:r31:6 out:0:r30:6
P9_25 107 in:0:r31:7 out:0:r30:7
P9_28 103 in:0:r31:3 out:0:r30:3
P9_29 101 in:0:r31:1 out:0:r30:1
P9_31 100 in:0:r31:0 out:0:r30:0
P9_42 104 in:0:r31:4 out:0:r30:4
giving the following pin configuration:
in: PRU0: 0,1,2,3,4,5,6,7,14,15,16
PRU1: 16
out: PRU0: 14,15
... with the latter set of P9 pins being the ones released by not using
mcasp. I can therefore set up two synchronous-data channels, one dedicated
output (2-pin, clock and data) and one dedicated input (9-pin, clock and
byte-wide data). If I can clock the input pins at ~20MHz, I have my 20
MBytes/sec. I even have a couple of input pins left over spare :)
My data needs are highly asymmetric (massive input, small output) so this
suits me, and it stops me from needing to switch over the input/output
configuration to get bi-directionality.
Hope this helps someone. I'm sure there's a better way to disable the mcasp
device, but I couldn't find it...
Simon
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