linux-kernel - [PATCH v3 0/7] Create a new sound card to access MICFIL based on rpmsg channel

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Date:   Fri, 30 Sep 2022 14:44:34 +0800
From:   Chancel Liu <chancel.liu@....com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, linuxppc-dev@...ts.ozlabs.org
Cc:     Chancel Liu <chancel.liu@....com>
Subject: [PATCH v3 0/7] Create a new sound card to access MICFIL based on rpmsg channel

At a previous time, we have successfully created a virtual sound card
based on rpmsg. The sound card works under this mechanism Cortex-A core
tells the Cortex-M core the format, rate, channel, .etc configuration
of the PCM parameters and Cortex-M controls real hardware devices such
as SAI and DMA. From the view of Linux side, the sound card is bound to
a rpmsg channel through which it can access SAI.

Here these patches are introduced to create a new virtual sound card to
access MICFIL based on a new created rpmsg channel. It's easy to create
a new rpmsg channel for MICFIL through rpmsg name service announcment.
Also the other ASoC components bound to this rpmsg MICFIL sound card
will be registered with these patches.

If other sound cards using different hardware devices needs to be
created over rpmsg in the future, these patches can be referred.

changes in v3
- Delete the statement referring to linux drivers in dts

changes in v2:
- Rename property in bindings file according to Krzysztof's comments
- Update codes and comments according to Shengjiu's comments

Chancel Liu (7):
  ASoC: dt-bindings: fsl_rpmsg: Add a property to assign the rpmsg
    channel
  ASoC: imx-audio-rpmsg: Create rpmsg channel for MICFIL
  ASoC: imx-pcm-rpmsg: Register different platform drivers
  ASoC: imx-pcm-rpmsg: Multi-channel support for sound card based on
    rpmsg
  ASoC: fsl_rpmsg: Register different ASoC machine devices
  ASoC: fsl_rpmsg: Multi-channel support in CPU DAI driver
  ASoC: imx-rpmsg: Assign platform driver used by machine driver to link
    with

 .../devicetree/bindings/sound/fsl,rpmsg.yaml  | 36 +++++++++++++++++--
 sound/soc/fsl/fsl_rpmsg.c                     |  6 ++--
 sound/soc/fsl/imx-audio-rpmsg.c               |  3 +-
 sound/soc/fsl/imx-pcm-rpmsg.c                 | 10 ++++--
 sound/soc/fsl/imx-rpmsg.c                     |  6 +++-
 5 files changed, 51 insertions(+), 10 deletions(-)

--
2.25.1