[alsa-devel] [PATCH] ASoC: codecs: dmic: Make number of channels configurable

[Rob Herring]

On Fri, Jan 05, 2018 at 12:39:57PM -0800, Matthias Kaehlcke wrote:
> The DMIC DAI driver specifies a number of 1 to 8 channels for each DAI.
> The actual number of mics can currently not be configured in the device
> tree or audio glue, but is derived from the min/max channels of the CPU
> and codec DAI. A typical CPU DAI has two or more channels, in consequence
> a single mic is treated as a stereo/multi channel device, even though
> only one channel carries audio data.
> 
> This change adds the option to specify the number of used DMIC channels
> in the device tree. When specified this value overwrites the default
> channels_max value of 8 in the snd_soc_dai_driver struct of the codec.
> 
> Signed-off-by: Matthias Kaehlcke <mka at chromium.org>
> ---
>  Documentation/devicetree/bindings/sound/dmic.txt |  2 ++

Reviewed-by: Rob Herring <robh at kernel.org>

>  sound/soc/codecs/dmic.c                          | 24 +++++++++++++++++++++++-
>  2 files changed, 25 insertions(+), 1 deletion(-)