[alsa-devel] [PATCH V2 2/3] add set_tdm_slot in tdm dai to define the relationship between audio channel and tdm slot

Barry Song 21cnbao at gmail.com
Tue Aug 18 04:53:39 CEST 2009

On Tue, Aug 18, 2009 at 1:50 AM, Mark
Brown<broonie at opensource.wolfsonmicro.com> wrote:
> On Thu, Aug 13, 2009 at 12:25:11PM +0800, Barry Song wrote:
>> For ad1938, the audio channel n just uses slot n, but for ad1836, it's
>> different, channel 0 uses slot 0, channel 1 uses slot 4, channels 2 uses
>> slot1, ... So add set_tdm_slot entry and use the mask field to define
>> the relationship between audio channel and slot number.
> I think what you're trying to describe here is that the device is
> expecting to see all the left channels on the bus followed by all the
> right channels?  This is the normal case for I2S TDM so no unusual
> configuration is required in order to implement it.
> I really don't think we should have Blackfin implementing a different
> API here - it makes the TDM slot API much harder to use.  Instead we
> should have a consistent API between all devices.  This may mean that we
> need to extend the APIs here.
Do you mean you will extend TDM API to handle this? I can follow your
on-going changes.

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