linux-kernel - Re: [PATCH v5 1/2] dt-bindings: usb: qcom,dwc3: Convert USB DWC3 bindings

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Message-ID: <20200423193923.GK199755@google.com>
Date:   Thu, 23 Apr 2020 12:39:23 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     "Sandeep Maheswaram (Temp)" <sanm@...eaurora.org>
Cc:     Rob Herring <robh@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: usb: qcom,dwc3: Convert USB DWC3
 bindings

On Wed, Apr 15, 2020 at 02:23:29PM +0530, Sandeep Maheswaram (Temp) wrote:
> Hi Rob,
> 
> Any suggestions to solve this error in assigned-clock-rates

> On 4/6/2020 10:09 PM, Sandeep Maheswaram (Temp) wrote:
> > Hi Rob,
> > 
> > On 4/4/2020 10:47 PM, Rob Herring wrote:
> > > On Thu, Mar 26, 2020 at 12:36:07PM +0530, Sandeep Maheswaram wrote:
> > > > Convert USB DWC3 bindings to DT schema format using json-schema.
> > > > 
> > > > Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> > > > ---
> > > >   .../devicetree/bindings/usb/qcom,dwc3.txt          | 104
> > > > --------------
> > > >   .../devicetree/bindings/usb/qcom,dwc3.yaml         | 158
> > > > +++++++++++++++++++++
> > > >   2 files changed, 158 insertions(+), 104 deletions(-)
> > > >   delete mode 100644
> > > > Documentation/devicetree/bindings/usb/qcom,dwc3.txt
> > > >   create mode 100644
> > > > Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> > > > b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> > > > new file mode 100644
> > > > index 0000000..0f69475
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml

...

> > > > +    items:
> > > > +      - description: Must be 19.2MHz (19200000).
> > > Sounds like a constraint:
> > > 
> > > - const: 19200000
> > > 
> > > > +      - description: Must be >= 60 MHz in HS mode, >= 125 MHz
> > > > in SS mode.
> > > - minimum: 60000000
> > >    maximum: ?
> > 
> > Tried  as below but facing errors
> > 
> > assigned-clock-rates:
> >     items:
> >       - const: 19200000
> >       - minimum: 60000000
> >         maximum: 150000000
> > 
> > Errors
> > 
> > linux-next/Documentation/devicetree/bindings/usb/qcom,dwc3.example.dt.yaml:
> > usb@...8800: assigned-clock-rates: Additional items are not allowed
> > ([150000000] was unexpected)
> > linux-next/Documentation/devicetree/bindings/usb/qcom,dwc3.example.dt.yaml:
> > usb@...8800: assigned-clock-rates:0: [19200000] is too short
> > linux-next/Documentation/devicetree/bindings/usb/qcom,dwc3.example.dt.yaml:
> > usb@...8800: assigned-clock-rates: [[19200000], [150000000]] is too long

judging from the error messages my uneducated guess is that the above rules for
assigned-clock-rates expect a single tuple of two elements, not two tuples with
a single element, i.e.

assigned-clock-rates = <19200000, 150000000>;

  instead of

assigned-clock-rates = <19200000>, <150000000>;

I experimented a bit but couldn't find the magic incantation to appease the
schema deities.

Rob, could you please help to distentangle this?

Thanks

Matthias