linux-kernel - Re: [PATCH v9 03/15] dt-bindings: usb: Maxim type-c controller device tree binding document

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Message-ID: <CAL_Jsq+bhEKGXoObGWbWw=1KQAovyJgvvfJe+=n7829HhKmmSw@mail.gmail.com>
Date:   Tue, 13 Oct 2020 08:50:28 -0500
From:   Rob Herring <robh@...nel.org>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Thierry Reding <treding@...dia.com>,
        Prashant Malani <pmalani@...omium.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v9 03/15] dt-bindings: usb: Maxim type-c controller device
 tree binding document

On Tue, Oct 13, 2020 at 8:43 AM Rob Herring <robh@...nel.org> wrote:
>
> On Wed, Oct 7, 2020 at 7:43 PM Badhri Jagan Sridharan <badhri@...gle.com> wrote:
> >
> > Hi Robb,
> >
> > Thanks for the reviews ! Responses inline.
> >
> > Regards,
> > Badhri
> >
> > On Mon, Oct 5, 2020 at 7:46 AM Rob Herring <robh@...nel.org> wrote:
> > >
> > > On Mon, Sep 28, 2020 at 07:39:52PM -0700, Badhri Jagan Sridharan wrote:
> > > > Add device tree binding document for Maxim TCPCI based Type-C chip driver
> > > >
> > > > Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> > > > ---
> > > > Changes since v1:
> > > > - Changing patch version to v6 to fix version number confusion.
> > > >
> > > > Changes since v6:
> > > > - Migrated to yaml format.
> > > >
> > > > Changes since v7:
> > > > - Rebase on usb-next
> > > >
> > > > Changes since v8:
> > > > - Fix errors from make dt_binding_check as suggested by
> > > >   Rob Herring.
> > > > ---
> > > >  .../devicetree/bindings/usb/maxim,tcpci.yaml  | 68 +++++++++++++++++++
> > > >  1 file changed, 68 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/usb/maxim,tcpci.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/usb/maxim,tcpci.yaml b/Documentation/devicetree/bindings/usb/maxim,tcpci.yaml
> > > > new file mode 100644
> > > > index 000000000000..f4b5f1a09b98
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/usb/maxim,tcpci.yaml
> > > > @@ -0,0 +1,68 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: "http://devicetree.org/schemas/usb/maxim,tcpci.yaml#"
> > > > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > > > +
> > > > +title: Maxim TCPCI Type-C PD controller DT bindings
> > > > +
> > > > +maintainers:
> > > > +  - Badhri Jagan Sridharan <badhri@...gle.com>
> > > > +
> > > > +description: Maxim TCPCI Type-C PD controller
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    enum:
> > > > +      - maxim,tcpci
> > >
> > > Is there a datasheet for this? Searching for 'tcpci' doesn't really come
> > > up with anything other than this patch. Only chip I found is MAX77958.
> > > Bindings are for specific h/w devices.
> >
> > Unfortunately the datasheet cannot be made public yet. Has the datasheet
> > have to be made public before sending the bindings ?
>
> No, but we need a part number or some assurance that 'tcpci' is a specific part.

I guess TCPCI is USB Type-C Port Controller Interface Specification.

That's just a protocol definition, not a chip. DT describes h/w which
is more than just the protocol.

Rob