linux-kernel - Re: [PATCH 0/8] media: i2c: adv748x: add support for HDMI audio

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Date:   Fri, 13 Mar 2020 09:31:07 +0100
From:   Alex Riesen <alexander.riesen@...itec.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
CC:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <devel@...verdev.osuosl.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 0/8] media: i2c: adv748x: add support for HDMI audio

Hi Hans,

Hans Verkuil, Fri, Mar 13, 2020 09:21:05 +0100:
> As a general note for this series: it might be better to have two
> patch series: one for patches 1 and 3-6 (not sure whether 5 can be included
> or not), and one where the public API changes (i.e. new V4L2 audio controls)
> are added. The first can probably be merged fairly quickly, the second will
> likely require more iterations since public API patches always take much longer
> before they are mature.

I see. After the discussion started, I started to have suspicions of my own
regarding the V4L2 ioctls. Except for log-status, which is a practical
diagnostics feature (even supported by v4l2-ctl), I'm thinking about dropping
them altogether in favor of audio soc DAI implementation.
The DAI implementation does all we ever needed from the device. Besides,
selecting a I2S protocol variant from user space (I2S vs I2S/TDM) never felt
right.

Shall I submit the log-status separately?

Regards,
Alex

> On 1/13/20 3:14 PM, Alex Riesen wrote:
> > This adds minimal support for controlling the audio output I2S port available
> > on ADV7481 and ADV7482 HDMI decoder devices by ADI. The port carries audio
> > signal from the decoded HDMI stream.
> > 
> > An ADV7482 on the Renesas Salvator-X ES1.1 was used during development of this
> > code.
> > 
> > Alex Riesen (8):
> >  1. media: adv748x: add a device-specific wrapper for register block read
> >  2. media: adv748x: add audio mute control and output selection ioctls
> >  3. media: adv748x: add log_status ioctl
> >  4. media: adv748x: reserve space for the audio (I2S) port in the driver
> >     structures
> >  5. media: adv748x: add an ASoC DAI definition to the driver
> >  6. media: adv748x: reduce amount of code for bitwise modification of
> >     device registers
> >  7. dt-bindings: adv748x: add information about serial audio interface
> >     (I2S/TDM)
> >  8. arm64: dts: renesas: salvator: add a connection from adv748x codec
> >     (HDMI input) to the R-Car SoC
> > 
> >  .../devicetree/bindings/media/i2c/adv748x.txt |  13 +-
> >  .../dts/renesas/r8a7795-es1-salvator-x.dts    |  24 +-
> >  .../boot/dts/renesas/salvator-common.dtsi     |  35 +-
> >  drivers/media/i2c/adv748x/adv748x-core.c      |  54 +++
> >  drivers/media/i2c/adv748x/adv748x-hdmi.c      | 355 ++++++++++++++++++
> >  drivers/media/i2c/adv748x/adv748x.h           |  53 ++-
> >  6 files changed, 523 insertions(+), 11 deletions(-)
> >