linux-kernel - Re: [PATCH v5 1/5] dt-bindings: connector: add typec-power-opmode property to usb-connector

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Date:   Mon, 9 Nov 2020 10:02:52 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Amelie DELAUNAY <amelie.delaunay@...com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Jun Li <lijun.kernel@...il.com>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "moderated list:ARM/STM32 ARCHITECTURE" 
        <linux-stm32@...md-mailman.stormreply.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Fabrice Gasnier <fabrice.gasnier@...com>
Subject: Re: [PATCH v5 1/5] dt-bindings: connector: add typec-power-opmode
 property to usb-connector

On Mon, Nov 9, 2020 at 9:54 AM Amelie DELAUNAY <amelie.delaunay@...com> wrote:
>
> On 11/9/20 4:03 PM, Rob Herring wrote:
> > On Fri, Nov 6, 2020 at 10:58 AM Amelie Delaunay <amelie.delaunay@...com> wrote:
> >>
> >> Power operation mode may depends on hardware design, so, add the optional
> >> property typec-power-opmode for usb-c connector to select the power
> >> operation mode capability.
> >>
> >> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
> >> ---
> >> Hi Bahdri, Rob,
> >>
> >> I've added the exlusion with FRS property, but new FRS property name
> >> should be use here so, be careful.
> >>
> >> ---
> >>   .../bindings/connector/usb-connector.yaml     | 24 +++++++++++++++++++
> >>   1 file changed, 24 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> >> index 62781518aefc..a84464b3e1f2 100644
> >> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> >> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> >> @@ -93,6 +93,24 @@ properties:
> >>         - device
> >>         - dual
> >>
> >> +  typec-power-opmode:
> >> +    description: Determines the power operation mode that the Type C connector
> >> +      will support and will advertise through CC pins when it has no power
> >> +      delivery support.
> >> +      - "default" corresponds to default USB voltage and current defined by the
> >> +        USB 2.0 and USB 3.2 specifications, 5V 500mA for USB 2.0 ports and
> >> +        5V 900mA or 1500mA for USB 3.2 ports in single-lane or dual-lane
> >> +        operation respectively.
> >> +      - "1.5A" and "3.0A", 5V 1.5A and 5V 3.0A respectively, as defined in USB
> >> +        Type-C Cable and Connector specification, when Power Delivery is not
> >> +        supported.
> >> +    allOf:
> >> +      - $ref: /schemas/types.yaml#definitions/string
> >> +    enum:
> >> +      - default
> >> +      - 1.5A
> >> +      - 3.0A
> >
> > Use the enums here. Unless you want to define it as actual current as
> > a numerical value.
>
> If I understand your point correctly, I think I should remove allOf here
> and stick with what is done to describe power-role and data-role
> property. Right ?

No, use the numerical values like FRS:

+      "1" refers to default USB power level as described by "Table
6-14 Fixed Supply PDO - Sink".
+      "2" refers to 1.5A@5V.
+      "3" refers to 3.0A@5V.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 3]

Rob