linux-kernel - Re: [PATCH 2/8] dt-bindings: soc: qcom: eud: Add usb role switch property

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <41a8e42b-69d7-49ef-97bf-84f260e2e709@kernel.org>
Date: Thu, 1 Aug 2024 09:46:17 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Elson Serrao <quic_eserrao@...cinc.com>, andersson@...nel.org,
 konrad.dybcio@...aro.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, gregkh@...uxfoundation.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/8] dt-bindings: soc: qcom: eud: Add usb role switch
 property

On 01/08/2024 02:16, Elson Serrao wrote:
> 
> 
> On 7/30/2024 10:36 PM, Krzysztof Kozlowski wrote:
>> On 31/07/2024 00:24, Elson Roy Serrao wrote:
>>> EUD hub is physically present in between the USB connector and the
>>> USB controller. So the role switch notifications originating from
>>> the connector should route through EUD. Hence to interpret the usb
>>> role assigned by the connector, role switch property is needed.
>>>
>>> Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
>>> ---
>>>  Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>>> index fca5b608ec63..0fa4608568d0 100644
>>> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>>> @@ -37,6 +37,10 @@ properties:
>>>      items:
>>>        - const: usb2-phy
>>>  
>>> +  usb-role-switch:
>>> +    $ref: /schemas/types.yaml#/definitions/flag
>>> +    description: Support role switch.
>>
>> So both EUD and DWC3 controller (as this binding states) are role switching?
>>
> 
> Yes. EUD would receive roles from the connector and relay it to the DWC3 controller. In addition to these roles, the DWC3 controller
> would also receive roles from EUD itself (related to USB attach/detach events).

Does not look right. Seems like you add something because it is easier
to code in drivers.

Best regards,
Krzysztof