linux-kernel - Re: [PATCH v3 1/2] dt-bindings: soundwire: add bindings for Qcom controller

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Date:   Tue, 15 Oct 2019 08:36:39 -0500
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Vinod <vkoul@...nel.org>, Mark Brown <broonie@...nel.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        devicetree@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        spapothi@...eaurora.org
Subject: Re: [PATCH v3 1/2] dt-bindings: soundwire: add bindings for Qcom controller

On Tue, Oct 15, 2019 at 7:22 AM Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
>
>
> On 15/10/2019 12:35, Rob Herring wrote:
> > On Mon, Oct 14, 2019 at 12:34 PM Srinivas Kandagatla
> > <srinivas.kandagatla@...aro.org> wrote:
> >>
> >> Thanks Rob for taking time to review,
> >>
> >> On 14/10/2019 18:12, Rob Herring wrote:
> >>> On Fri, Oct 11, 2019 at 04:44:22PM +0100, Srinivas Kandagatla wrote:
> >>>> This patch adds bindings for Qualcomm soundwire controller.
> >>>>
> >>>> Qualcomm SoundWire Master controller is present in most Qualcomm SoCs
> >>>> either integrated as part of WCD audio codecs via slimbus or
> >>>> as part of SOC I/O.
> >>>>
> >>>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >>>> ---
> >>>>    .../bindings/soundwire/qcom,sdw.txt           | 167 ++++++++++++++++++
> >>>>    1 file changed, 167 insertions(+)
> >>>>    create mode 100644 Documentation/devicetree/bindings/soundwire/qcom,sdw.txt
> >>>
> >>> Next time, do a DT schema.
> >>>
> >> Sure! I can do that in next version!
> >
> > I meant the next binding you write, not v4. However, ...
> >
> > [...]
> >
> >>>> += SoundWire devices
> >>>> +Each subnode of the bus represents SoundWire device attached to it.
> >>>> +The properties of these nodes are defined by the individual bindings.
> >>>
> >>> Is there some sort of addressing that needs to be defined?
> >>>
> >> Thanks, Looks like I missed that here.
> >>
> >> it should be something like this,
> >>
> >> #address-cells = <2>;
> >> #size-cells = <0>;
> >>
> >> Will add the in next version.
> >
> > You need a common soundwire binding for this. You also need to define
> > the format of 'reg' and unit addresses. And it needs to be a schema.
> > So perhaps this binding too should be.
>
> We already have a common SoundWire bindings in mainline for this
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/soundwire/soundwire-controller.yaml?h=v5.4-rc3

Indeed... :)

> Should this binding just make a reference to it instead of duplicating
> this same info here?

Yes, that should be sufficient.

Rob