MX28EVK mainline 3.5-Patchs-3.5-rc5 sgtl5000 record not working

On Mon, Jul 16, 2012 at 07:23:42PM +0800, Andreas Gretler wrote:
Sorry for late reply, a little busy these days and did not have too much
time to research it.

I'm new to driver development and I want to develop a driver for the
Cirrus cs5381 ADC Codec. That's why I want to understand the saif
code.  The codec is pretty simple, because it can be only configured
the data output format and the Master/slave Clock mode.  Unfortunately
i would like to get the codec working in master mode with MCLK is
driven by external clock source to the codec.
I see in the source code
that only EXTMSTR0 mode is implemented. I would like to get the DIRECT
mode working, and use SAIF1 in Slave mode for recive only.  For my
understanding in the SGTL5000 drive, the SAIF1 works in slave mode and
get it BITCLK and LRCLK from Saif0. I think and hope that the changes
to get the Directmode working is not very much.  The Codec provide the
BITCLK and LRCLK to the cpu . But I don't unterstand to handle that
each Saif must have a master, described in the mxs-saif.c comment.
Because in my hardware setup I only need SAIF1 in Slave mode. Can you
give me a hint howto handle this?

Hmm, the most quick method maybe saif as master and codec as slave since
current driver supports that.
If you really want the codec to be master, what i think you can try is:
1) make the saif driver support working on slave mode for record
Currently mxs-saif driver only supports master mode, mainly due to saif
tx can only work as master so we simply make saif as master by default to
codec for both rx/tx. But from spec, saif could be a slave to codec and
receive clocks from codec if only working on rx.
You may need change mxs_saif_set_dai_fmt a bit.
2) you probably also need set saif clkmux to DIRECT mode via
mxs_saif_clkmux_select.
3) If you want the saif to provide mclk to codec, i have tried that saif
can also output mclk when working on slave mode.
But i have no such board working like that, you may need give a try
if saif can work properly on that mode for record.

Regards
Dong Aisheng