linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: add vbus-supply optional property to phy-stm32-usbphyc

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Message-ID: <5c0d0bc5-1243-fcda-4578-da6cad80c53c@foss.st.com>
Date:   Fri, 26 Mar 2021 10:05:32 +0100
From:   Amelie DELAUNAY <amelie.delaunay@...s.st.com>
To:     Rob Herring <robh@...nel.org>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH 1/2] dt-bindings: phy: add vbus-supply optional property
 to phy-stm32-usbphyc

Hi Rob,

On 3/26/21 1:28 AM, Rob Herring wrote:
> On Wed, Mar 17, 2021 at 05:09:53PM +0100, Amelie Delaunay wrote:
>> This patch adds vbus-supply optional property to phy sub-nodes.
>> A regulator for USB VBUS may be needed for host mode.
>>
>> Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
>> ---
>>   Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> index 018cc1246ee1..ad2378c30334 100644
>> --- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> +++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> @@ -71,6 +71,9 @@ patternProperties:
>>         phy-supply:
>>           description: regulator providing 3V3 power supply to the PHY.
>>   
>> +      vbus-supply:
>> +        description: regulator providing 5V Vbus to the USB connector.
> 
> Unless Vbus is powering the phy, then this only belongs in the USB
> connector node.
> 

Do you mean I should declare a connector node as a child of the phy node 
and get the vbus-supply property from this connector node ?

In case of a on-board autonomous hub between the phy and the connectors, 
so no driver to drive it nor to get the vbus-supply property to provide 
VBUS to the hub, then the connectors, how to use connector ?

[USB controller]===[USB PHY]===[(USB HUB)]===|> USB A connector
                               /              |> USB A connector
                             VBUS             |> USB A connector
                                              |> USB A connector

Please advise.

Regards,
Amelie

>> +
>>         "#phy-cells":
>>           enum: [ 0x0, 0x1 ]
>>   
>> -- 
>> 2.17.1
>>