linux-kernel - Re: [PATCH v2 0/3] dt-bindings: connector: usb: provide bindings for altmodes

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Message-ID: <CAA8EJppW3v7Ozr+KnoYYF6GXE5DqqMjEiETpaqfC_sE3ufNhfA@mail.gmail.com>
Date:   Thu, 16 Nov 2023 22:39:19 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 0/3] dt-bindings: connector: usb: provide bindings for altmodes

On Thu, 16 Nov 2023 at 20:36, Rob Herring <robh@...nel.org> wrote:
>
> On Tue, Nov 14, 2023 at 12:13:26AM +0200, Dmitry Baryshkov wrote:
> > In some cases we need a way to specify USB-C AltModes that can be
> > supportd on the particular USB-C connector. For example, x86 INT33FE
> > driver does this by populating fwnode properties internally. For the
> > Qualcomm Robotics RB5 platform (and several similar devices which use
> > Qualcomm PMIC TCPM) we have to put this information to the DT.
> >
> > Provide the DT bindings for this kind of information and while we are at
> > it, change svid property to be 16-bit unsigned integer instead of a
> > simple u32.
> >
> > NOTE: usage of u16 is not compatible with the recenty extended
> > qcom/qrb5165-rb5.dts DT file. I'm looking for the guidance from DT and
> > USB maintainers whether to retain u32 usage or it's better to switch to
> > u16.
>
> Depends if you are fine with the ABI break on this platform...

As much as I hate it, yes, we are.

-- 
With best wishes
Dmitry