[alsa-devel] [PATCH 0/3] ASoC: Enable a new IC master mode: bcm2835<=>IC<=>cs42xx8

[Matthias Reichl]

On Sat, Feb 25, 2017 at 04:03:11PM +1100, Matt Flax wrote:
> This patch set lets the ASoC system specify that an IC between the SoC and codec
> is master. This is intended to put both the SoC and Codec into slave modes.
> 
> By default un-patched SoC and Codec drivers will return -EINVAL if they aren't
> enabled and tested for this mode.
> 
> soc-dia.h has the new SND_SOC_DAIFMT_IBM_IFM definition set as :
> #define SND_SOC_DAIFMT_IBM_IFM		(5 << 12) /* IC clk & FRM master */
> 
> The cs42xx8 codec driver is enabled for this mode and so too is the BCM2835
> SoC driver. This forms a chain : bcm2835<=>IC<=>cs42xx8
> where the IC is bit and frame master.

Model your IC as a codec. No need to add patches to random drivers
and add a flag with the rather meaningless semantics "someone else is
automagically setting up clocks for me".

so long,

Hias
> 
> Matt Flax (3):
>   ASoC : Add an IC bit and frame master mode (SoC and Codec slave).
>   ASoC: cs42xx8: allow IC master mode.
>   ASoC: bcm2835: Add mutichannel mode in DSP and IC master modes.
> 
>  include/sound/soc-dai.h     |  9 ++++++---
>  sound/soc/bcm/bcm2835-i2s.c | 21 ++++++++++++++++++++-
>  sound/soc/codecs/cs42xx8.c  |  1 +
>  3 files changed, 27 insertions(+), 4 deletions(-)
> 
> -- 
> 2.7.4
>