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

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Date:   Fri, 8 Mar 2019 13:07:38 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Li Jun <jun.li@....com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Min Guo <min.guo@...iatek.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/5] dt-bindings: connector: add optional properties for
 Type-B

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@...iatek.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 ?

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.

> +- 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.

> +- 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