linux-kernel - Re: [PATCH v4 1/2] dt-bindings: usb: ehci: add optional external vbus supply property

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Message-ID: <CAL_Jsq+iPZN-RV61+AFcRg-eKORQDQ9-4s4-vaFOrCqWBK8PDg@mail.gmail.com>
Date:   Tue, 6 Mar 2018 08:40:48 -0600
From:   Rob Herring <robh@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Amelie Delaunay <amelie.delaunay@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Tony Prisk <linux@...sktech.co.nz>,
        Alan Stern <stern@...land.harvard.edu>,
        Roger Quadros <rogerq@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/2] dt-bindings: usb: ehci: add optional external vbus
 supply property

On Tue, Mar 6, 2018 at 8:09 AM, Robin Murphy <robin.murphy@....com> wrote:
> On 06/03/18 01:57, Rob Herring wrote:
>>
>> On Thu, Mar 01, 2018 at 10:51:38AM +0100, Amelie Delaunay wrote:
>>>
>>> On some boards, especially when vbus supply requires large current,
>>> and the charge pump on the PHY isn't enough, an external vbus power
>>> switch
>>> per port may be used.
>>> Add portN_vbus-supply property to usb-ehci bindings. As the number of
>>> ports
>>> depends on the ehci controller, and the port on which an external vbus
>>> supply depends on the platform, <portN> is used to make it generic.
>>>
>>> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
>>> ---
>>>   Documentation/devicetree/bindings/usb/usb-ehci.txt | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt
>>> b/Documentation/devicetree/bindings/usb/usb-ehci.txt
>>> index 3efde12..cd576db 100644
>>> --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
>>> +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
>>> @@ -19,6 +19,7 @@ Optional properties:
>>>    - phys : phandle + phy specifier pair
>>>    - phy-names : "usb"
>>>    - resets : phandle + reset specifier pair
>>> + - portN_vbus-supply : phandle of regulator supplying vbus for port N
>>
>>
>> Just make this an array with the index being the port (and drop
>> "portN_").
>
>
> Does that still work if there is an external supply for port 1 but none for
> port 0? I believe that was brought up as a possibility before.

Yes, if you use 0 or -1 to skip over an index.

Really, this should go in the connector node instead because Vbus is
supplied to the connector, not the host controller. The connector
binding is on its way into mainline.

Rob