Re: [PATCH 1/5] dt-bindings: connector: add optional properties for Type-B

Chunfeng Yun
2019-03-11T05:33:27Z

Hi,

On Fri, 2019-03-08 at 13:07 +0100, Hans de Goede wrote:
> Hi,
>
> On 08-03-19 07:13, Chunfeng Yun wrote:
> > Add id-gpios, vbus-gpios, vbus-supply and pinctrl properties for
> > usb-b-connector
> >
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > ---
> > .../devicetree/bindings/connector/usb-connector.txt | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
> > index a9a2f2fc44f2..7a07b0f4f973 100644
> > --- a/Documentation/devicetree/bindings/connector/usb-connector.txt
> > +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
> > @@ -17,6 +17,16 @@ Optional properties:
> > - self-powered: Set this property if the usb device that has its own power
> > source.
> >
> > +Optional properties for usb-b-connector:
> > +- id-gpios: gpio for USB ID pin.
>
> What about boards where the ID pin is *not* connected to a GPIO,
> but e.g. to a special pin on the PMIC which can also detect
> an ACA adapter ? Currently this case is handled by extcon
> drivers, but we have no way to set e.g. vbus-supply for the
> connector. Maybe in this case the usb-connector node should
> be a child of the PMIC node ?
Yes, it would be, PMIC is in charger of detecting the status of ID pin
>
> And in many cases there also is a mux to switch the datalines
> between the host and device(gadget) controllers, how should
> that be described in this model? See the new usb-role-switch
> code under drivers/usb/roles
>
> In some cases the mux is controlled through a gpio, so we
> may want to add a "mux-gpios" here in which case we also
> need to define what 0/1 means.
I'm not sure, the mux seems not belong to this connector,
and may need another driver to register usb-role-switch,
similar to:

[v2,2/2] usb: typec: add typec switch via GPIO control
https://patchwork.kernel.org/patch/10834327/

>
> > +- vbus-gpios: gpio for USB VBUS pin.
> > + see gpio/gpio.txt.
> > +- vbus-supply: reference to the VBUS regulator, needed when supports
> > + dual-role mode.
>
> I think this needs some text that there can be either a vbus-gpio or
> a vbus-supply. Oh wait reading:
>
> https://patchwork.kernel.org/patch/10819377/
>
> I see that this GPIO is for detecting vbus presence, not for driving/enabling
> 5v to Vbus from the board, that needs to be described more clearly.
Ok

Thanks a lot
>
> > +- pinctrl-names : a pinctrl state named "default" is optional
> > +- pinctrl-0 : pin control group
> > + see pinctrl/pinctrl-bindings.txt
> > +
> > Optional properties for usb-c-connector:
> > - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
> > connector has power support.
> >
>
>
> Regards,
>
> Hans