On Thu, Mar 5, 2009 at 1:55 PM, Daniel Mack daniel@caiaq.de wrote:
On Thu, Mar 05, 2009 at 12:03:35PM +0000, Mark Brown wrote:
The other option would be to use the TDM mode interface to set this up since that's roughly what it is; my main concern here is that we already have two ways of doing this and I'd like to try to keep the number down for consistency.
Probably a matter of taste, but IMO TDM mode is not the place either. Userspace could decide sending out 24bit samples out of a sudden (which the CPU DAI might accept) and in this case, you'd need some special logic in the board file again to set up deviders, time slots etc, right?
That's why the clocking interface is generally used here - it's more orthogonal.
Hmm, how would you express 24 sample bits with 32 clocks per channel? I might not have gotten your point yet - could you provide an example?
I'm still a bit confused by the alsa formats and how they interact with the SSP formats.
Do I understand correctly that S24_3LE (24-bit packed in 3 bytes) can't be supported due to limitations in (at least PXA27x's) DMA engine? So the remaining 24-bit formats are S24_LE and S32_LE anyway, both of which are 24-bit packed in 32 bits (either LSB or MSB aligned).
regards Philipp