Revisited, audio codec device tree entries.
timur at freescale.com
Tue Nov 20 02:02:05 EST 2007
Jon Smirl wrote:
> In the ALSA SOC model the i2s, codec and ac97 drivers are all generic.
> A fabric driver tells specifically how a generic codec is wired into
> the board. What I haven't been able figure out is how to load the
> right fabric driver.
Do not use the device tree to load the fabric driver!
The layout of the hardware and the relationship between the I2S, I2C, codec,
and whatever device is determined by *both* the fabric driver and the device
tree. The information about the devices itself, and *some* information about
their relationship is stored in the device tree. Everything else is in the
The design of the device tree is already locked in stone, so to speak. The DT
can only store what it is allowed to store. If there's something more that
you need, you'll have to put it in the fabric driver.
If I weren't on vacation this week, I'd email you my code. It's almost done
and it demonstrates what I'm thinking.
Linux Kernel Developer @ Freescale
More information about the Linuxppc-dev