On Thu, Jul 07, 2011 at 06:38:33PM +0200, Takashi Iwai wrote:
It's not clear what you mean exactly as "unfixed", but in general, the decision rather depends on the usage of the device. If it's designed for a use as a desktop PC component (such as a PCI card or onboard-audio on PC), it'd make sense to implement as a stand-alone, self-contained driver.
OTOH, if it's targeted mainly for embedded area, ASoC is the right answer. It's more modularized, and can be more flexibly configured in the end.
I'd say it depends rather more on the physical system design. If there are a bunch of separate chips which are interacted with separately by software then ASoC makes sense, if the card is one logical object to hardware a vanilla ALSA driver probably does.