[alsa-devel] Number of PCM instance (pcm device file) for one sound card

Dear all ,

The tutorial below states that ""Each card device can have up to four pcm instances" https://www.kernel.org/doc/html/v4.19/sound/kernel-api/writing-an-alsa-drive... https://www.google.com/url?q=https://www.kernel.org/doc/html/v4.19/sound/kernel-api/writing-an-alsa-driver.html%23pcm-interface&sa=D&source=hangouts&ust=1573928998988000&usg=AFQjCNGmZgiENmLej2aBTQvp-tspn3u8sg

I am getting confused with the number '4' . I thought we can add 8 pcm device files by default. By setting 'CONFIG_SND_DYNAMIC_MINORS=y' , we can have more than 8 pcm device files. Does that tutorial mean only 4 pcm devices running at the same time ?

Thanks a lot,

Xinhui,