linux-kernel - Re: [PATCH v2] usb: dwc3: Add support for VBUS power control

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Message-ID: <be0f6d7b-aa2e-39de-f5ee-83592c9bed7f@topic.nl>
Date:   Thu, 11 Jun 2020 08:09:22 +0200
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     Rob Herring <robh@...nel.org>
CC:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        balbi@...nel.org
Subject: Re: [PATCH v2] usb: dwc3: Add support for VBUS power control


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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On 10-06-2020 22:22, Rob Herring wrote:
> On Wed, Jun 03, 2020 at 02:09:15PM +0200, Mike Looijmans wrote:
>> Support VBUS power control using regulator framework. Enables the regulator
>> while the port is in host mode.
>>
>> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
>> ---
>> v2: Add missing devm_regulator_get call which got lost during rebase
>>
>>   .../devicetree/bindings/usb/dwc3.txt          |  1 +
>>   drivers/usb/dwc3/core.c                       | 34 ++++++++++++++-----
>>   drivers/usb/dwc3/core.h                       |  4 +++
>>   drivers/usb/dwc3/drd.c                        |  6 ++--
>>   4 files changed, 33 insertions(+), 12 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>> index 9946ff9ba735..56bc3f238e2d 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>> @@ -37,6 +37,7 @@ Optional properties:
>>    - phys: from the *Generic PHY* bindings
>>    - phy-names: from the *Generic PHY* bindings; supported names are "usb2-phy"
>>   	or "usb3-phy".
>> + - vbus-supply: Regulator handle that provides the VBUS power.
> Does the DWC3 block require Vbus to power itself? Doubtful. This
> belongs in a usb-connector node. If the DWC3 driver wants to get the
> Vbus supply, it can fetch it from that node.
>
> Rob

Ah, now I understand. There's a vbus-supply in the connector in newer 
kernel versions than the one I have to test with. It'll have to wait 
until I've been able to upgrade the kernel version for this board.


-- 
Mike Looijmans