linux-kernel - Re: [PATCH v2 01/11] ASoC: dt-bindings: add dt bindings for WCD9340/WCD9341 audio codec

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Message-ID: <CAL_JsqJNcXe7YSUjHWyFO_czncnR3y7w3NP8ofXfCiXpMrqzRw@mail.gmail.com>
Date:   Tue, 5 Nov 2019 13:08:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Vinod Koul <vinod.koul@...aro.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        spapothi@...eaurora.org, Banajit Goswami <bgoswami@...eaurora.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v2 01/11] ASoC: dt-bindings: add dt bindings for
 WCD9340/WCD9341 audio codec

On Wed, Oct 30, 2019 at 4:55 AM Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
>
>
> On 29/10/2019 20:47, Rob Herring wrote:
> > On Mon, Oct 28, 2019 at 7:45 AM Srinivas Kandagatla
> > <srinivas.kandagatla@...aro.org> wrote:
> >>
> >>
> >>
> >> On 28/10/2019 12:40, Srinivas Kandagatla wrote:
> >>> Its Phandle.
> >>>
> >>> something like this is okay?
> >>>
> >>> slim-ifc-dev:
> >>>     $ref: '/schemas/types.yaml#/definitions/phandle-array'
> >>
> >> Sorry this should not be an array, so something like this:
> >>
> >>     slim-ifc-dev:
> >>       description: SLIMBus Interface device phandle
> >
> > You're just spelling out the abbreviated name. I can do that much.
> > What is 'SLIMBus Interface device'?
>
> Each SLIMBus Component contains one Interface Device. Which is
> responsible for Monitoring and reporting the status of component, Data
> line to Data pin connection setup for SLIMBus streaming. Interface
> device is enumerated just like any other slim device.

So a standard set of registers every slimbus device has? In hindsight,
I would have made reg have 2 entries with both addresses. I guess that
ship has sailed.

It seems strange you would need both "devices" described as separate
nodes in DT.

>
> We already have exactly same bindings for WCD9335 in upstream at:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/sound/qcom,wcd9335.txt?h=v5.4-rc5#n42
>
> >
> > Is it a standard SLIMBus property? If so, document it in the right
> > place. If not, then needs a vendor prefix.
>
> "SLIMBus Interface Device" itself is documented in SLIMBus Specification.
>
> If I remember it correctly You suggested me to move to "slim-ifc-dev"
> as this is part of SLIMBus Specification.

Probably so. If it is common, then document it in bindings/slimbus/bus.txt.

Then here, 'slim-ifc-dev: true' is sufficient. You can just assume we
convert bus.txt to schema (or feel free to do that :) ).

Rob