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

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Message-ID: <20200513160443.GK4525@google.com>
Date:   Wed, 13 May 2020 09:04:43 -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

Hi Sandeep,

I would suggest to send v6 with the changes Rob and Stephen requested,
except for the 'assigned-clock-rate' constraints. A description instead
of the constraints is not ideal, but the constraints could be also be
added at a later time. Hopefully Rob can either ack with the description
or help to resolve the constraints issue.

Regards

Matthias

On Fri, May 08, 2020 at 11:52:52AM +0530, Sandeep Maheswaram (Temp) wrote:
> Hi Rob,
> 
> Any suggestions to solve this error in assigned-clock-rates
> 
> 
> Regards
> Sandeep
> 
> On 4/24/2020 1:09 AM, Matthias Kaehlcke wrote:
> > 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
> 
> -- 
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>