Re: [RESEND PATCH v2 1/6] dt-bindings: connector: add power-opmode optional property to usb-connector

[Amelie DELAUNAY]

On 9/23/20 11:08 AM, Jun Li wrote:
> Amelie Delaunay <amelie.delaunay@xxxxxx> 于2020年9月2日周三 下午4:01写道：
> > Power operation mode may depends on hardware design, so, add the optional
> > property power-opmode for usb-c connector to select the power operation
> > mode capability.
> >
> > Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
> > ---
> > Changes in v2:
> > - Add description for possible operation current values
> > ---
> >   .../bindings/connector/usb-connector.yaml     | 20 +++++++++++++++++++
> >   1 file changed, 20 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > index 9bd52e63c935..2fd85b9a7e1a 100644
> > --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > @@ -88,6 +88,26 @@ properties:
> >         - device
> >         - dual
> >
> > +  power-opmode:
> > +    description: Determines the power operation mode that the Type C connector
> > +      will support and will advertise through CC pins.
> > +      - "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.
> > +      - "usb_power_delivery" when Power Delivery is supported, as defined in
> > +        USB Power Delivery specification.
>
> Why need "usb_power_delivery"? isn't this information can be implied by
> existing properties like if "source-pdos" is present?

power-opmode is an optional property.
usb_power_delivery, as 3.0A, 1.5A or default here, only reflect the 
possible power operation mode you can set and that are understood by 
typec class:
static const char * const typec_pwr_opmodes[] = {
	[TYPEC_PWR_MODE_USB]	= "default",
	[TYPEC_PWR_MODE_1_5A]	= "1.5A",
	[TYPEC_PWR_MODE_3_0A]	= "3.0A",
	[TYPEC_PWR_MODE_PD]	= "usb_power_delivery",
};

But I guess that a Type-C controller with usb power delivery support 
won't use power-opmode property but rather source/sink-pdos.

power-opmode shows what will be advertised through CC pins. I can remove 
usb_power_delivery from the possible values, but what about the user who 
will add power-opmode property to configure his Type-C controller with 
USB power delivery support (sink and/or source by the way) ?
Should I restrict the use of power-opmode to non-USB power delivery 
Type-C controllers ?
Please advise.

Regards,
Amelie


> Li Jun
> > +    allOf:
> > +      - $ref: /schemas/types.yaml#definitions/string
> > +    enum:
> > +      - default
> > +      - 1.5A
> > +      - 3.0A
> > +      - usb_power_delivery
> > +
> >     # The following are optional properties for "usb-c-connector" with power
> >     # delivery support.
> >     source-pdos:
> > --
> > 2.17.1