Is SPDIF supported?

#1

When looking at the schematics, can I conclude that spdif-out is connected to GPIOH_4 (pin 19)?

When correct, does anyone have additoins to the dts or an overlay?

#2

That’s a good question. The SoC datasheet does show SPDIF out as an available function on GPIOH_4, but the GPIO pinout does not. The schematic suggests the function is used for HDMI so maybe it is reserved for that? We’d need @RadxaYuntian to weigh in.

#3

GPIOH_4 is connected exclusively to GPIO header, so it is not used by anything else. All I know about SPDIF is that it has a single blinky LED, so I’d assume it only requires 1 pin to function, and in that case you could enable SPDIF on this pin.

External circuits, dtb overlay, and some in-system audio config files are likely required. We currently have no plan to support this use case, but will consider this when we work on the next Zero image release.

#4

Any chance getting a patch for us (volumio.org)?
We are seriously considering adding radxa zero as a much faster alternative to the Volumio PI Zero version, where SPDIF would be an additional big big plus.

I tried enabling spdif out, but had no success so far.

#5

@maycides Please add this feature request to our issue tracker and check if Jianfeng can work on this.

#6

Affiliate development plan completed.
Feng will develop it after the completion of CM3 I2S.

#7

Much appreciated! Thanks.

#8

I’ve done SPDIF, @RadxaYuntian has the dts patches for both zero and zero2 to create the overlays from them.