linux-kernel - Re: [PATCH v2] usb/phy-generic: Add support for OTG VBUS supply control

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Date:   Wed, 3 Jun 2020 11:00:41 +0200
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     Rob Herring <robh@...nel.org>
CC:     linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
        balbi@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb/phy-generic: Add support for OTG VBUS supply
 control


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands

T: +31 (0) 499 33 69 69
E: mike.looijmans@...icproducts.com
W: www.topicproducts.com

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On 29-05-2020 23:08, Rob Herring wrote:
> On Fri, May 29, 2020 at 08:00:45AM +0200, Mike Looijmans wrote:
>> This enables support for VBUS on boards where the power is supplied
>> by a regulator. The regulator is enabled when the USB port enters
>> HOST mode.
>>
>> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
>> ---
>> v2: Added missing "return 0;" in set_vbus method
>>
>>   .../devicetree/bindings/usb/usb-nop-xceiv.txt |  3 ++
>>   drivers/usb/phy/phy-generic.c                 | 46 ++++++++++++++++++-
>>   drivers/usb/phy/phy-generic.h                 |  2 +
>>   3 files changed, 50 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
>> index 4dc6a8ee3071..775a19fdb613 100644
>> --- a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
>> +++ b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
>> @@ -16,6 +16,9 @@ Optional properties:
>>   
>>   - vcc-supply: phandle to the regulator that provides power to the PHY.
>>   
>> +- vbus-supply: phandle to the regulator that provides the VBUS power for when
>> +  the device is in HOST mode.
>> +
> I'm going to say no to expanding this binding...
>
> First, there sure are a lot of controls on a NOP tranceiver.
>
> Second, unless Vbus is supplying the PHY, then this belongs in a
> connector node for which this is already supported.

Clear, I moved the implementation to the DWC3 driver and will submit a 
new patch for that.


>
>>   - reset-gpios: Should specify the GPIO for reset.
>>   
>>   - vbus-detect-gpio: should specify the GPIO detecting a VBus insertion


-- 
Mike Looijmans