[alsa-devel] ASoC DAI on Atmel AT32AP7000

Mark Brown broonie at opensource.wolfsonmicro.com
Sun Aug 30 12:02:28 CEST 2009

On Sat, Aug 29, 2009 at 09:41:59PM +0300, Christos Nikolaou wrote:

> Up to 2.6.28 the ASoC framework was working on AT32AP7000 Atmel platform.
> Now I try to recompile it on 2.6.31-rc8 and I get

> Advance Linux Sound Architecture Driver Version 1.0.20.
> No device for DAI atmel-ssc0
> No device for DAI atmel-ssc1
> No device for DAI atmel-ssc2

That's fine, these are just warning messages and have no actual effect
on operation.

> whereas the ssc devices are properly (as in 2.6.28) initialized
> ssc ssc.0: Atmel SSC device at 0xffe1c00 (irq 10)
> ssc ssc.1: Atmel SSC device at 0xffe2000 (irq 11)
> ssc ssc.2: Atmel SSC device at 0xffe2400 (irq 12)

This is outside the control of ASoC - it's generated by the core SSC
support in drivers/misc/atmel-ssc.c.  Probably you're missing code to
register the SSC device in your board file, you should be calling
add_device_ssc() somewhere in your arch/arm code and ssc_request() in
your machine file.

> It looks that this message comes from snd_soc_register_dai in soc-core.c

> if (!dai->dev)
>          printk(KERN_WARNING "No device for DAI %s\n", dai->name);

> it seems for some reason it thinks there is no device in dai->dev

Yes, the reason for this being that the Atmel driver currently doesn't
make any effort to initialise the device.  At the minute that's purely a
cosmetic error.  Before it becomes an actual problem the drivers will be
updated to fill in a device.

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