I am having trouble outputting sound on Linux using SSM2603.
The SSM2603 device driver loads normally.
It is also registered in ALSA sound card list.
However, "input / output error" is raised in "alsactl init". ("amixer" is also the same.)
It plays when I play wave file with "aplay" but it does not output to "R/LOUT pin" of SSM2603.
Thank you for your reply.
I bought "Zybo-z7-10" to solve this problem.
The kernel 4.9 included with petalinux was used.
I thought there might be a problem with the ALSA configuration.
But the cause of the problem was elsewhere.
I found that the ssm2602 driver provided by ADI does not work with kernel 4.9.
The ADI should be informed on the SSM2603 page.
I had to waste weeks because of this problem.
Applying the patch below fixes the problem.
ASoC: ssm2602: Replace reg_default_raw with reg_default - Patchwork