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

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Date:   Fri, 29 May 2020 15:08:16 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mike Looijmans <mike.looijmans@...ic.nl>
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

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.

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