linux-kernel - Re: [PATCH v8 2/6] ASoC: rockchip-max98090: Support usage with and without HDMI

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Date:   Fri, 25 Oct 2019 11:22:32 -0500
From:   Rob Herring <robh@...nel.org>
To:     Cheng-Yi Chiang <cychiang@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Heiko Stuebner <heiko@...ech.de>,
        Mark Rutland <mark.rutland@....com>, dianders@...omium.org,
        dgreid@...omium.org, tzungbi@...omium.org,
        alsa-devel@...a-project.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v8 2/6] ASoC: rockchip-max98090: Support usage with and
 without HDMI

On Fri, Oct 25, 2019 at 09:30:03PM +0800, Cheng-Yi Chiang wrote:
> There will be multiple boards sharing this machine driver.
> Use compatible string to specify the use case.
> 
> "rockchip,rockchip-audio-max98090" for max98090-only.
> "rockchip,rockchip-audio-hdmi" for HDMI-only
> "rockchip,rockchip-audio-max98090-hdmi" for max98090 plus
> 
> Move these properties to optional because they are not needed for
> HDMI-only use case.
> "rockchip,audio-codec": The phandle of the MAX98090 audio codec
> "rockchip,headset-codec": The phandle of Ext chip for jack detection
> 
> The machine driver change will add support for HDMI codec in
> rockchip-max98090.
> Add one optional property "rockchip,hdmi-codec" to let user specify HDMI
> device node in DTS so machine driver can find hdmi-codec device node for
> codec DAI.

Why not just use the presence of rockchip,hdmi-codec to enable HDMI or 
not. Maybe you still add rockchip,rockchip-audio-hdmi for HDMI only.

Really, the same should have been done for which codec is used too, but 
I guess someone wanted 2 machine drivers.

> 
> Signed-off-by: Cheng-Yi Chiang <cychiang@...omium.org>
> ---
>  .../bindings/sound/rockchip-max98090.txt      | 38 +++++++++++++++++--
>  1 file changed, 35 insertions(+), 3 deletions(-)