[PATCH v2 2/3] drm/vc4: Add HDMI audio support

[Eric Anholt]

Eric Anholt <eric at anholt.net> writes:

> The HDMI encoder IP embeds all needed blocks to output audio, with a
> custom DAI called MAI moving audio between the two parts of the HDMI
> core.  This driver now exposes a sound card to let users stream audio
> to their display.
>
> Using the hdmi-codec driver has been considered here, but MAI meant
> having to significantly rework hdmi-codec, and it would have left
> little shared code with the I2S mode anyway.
>
> The encoder requires that the audio be SPDIF-formatted frames only,
> which alsalib will format-convert for us.
>
> This patch is the combined work of Eric Anholt (initial register setup
> with a separate dmaengine driver and using simple-audio-card) and
> Boris Brezillon (moving it all into HDMI, massive debug to get it
> actually working), and which Eric has the permission to release.
>
> v2: Drop "-audio" from sound card name, since that's already implied
>     (suggestion by Boris)

On IRC, Mark Brown disclaimed responsibility for reviewing this code, so
I've merged it to drm-misc-next.
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