linux-kernel - Re: [PATCH] dt-bindings: usb: dwc2: document the vbus-supply property

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Date:   Thu, 21 Mar 2019 20:21:14 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     hminas@...opsys.com, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, amelie.delaunay@...com,
        felipe.balbi@...ux.intel.com
Subject: Re: [PATCH] dt-bindings: usb: dwc2: document the vbus-supply property

On Wed, Mar 6, 2019 at 10:24 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> Various boards have an external VBUS supply regulator. This regulator
> depends on the current mode of the controller which is defined as:
> - dr_mode set to either "host" or "peripheral" (fixed value)
> - dr_mode set to "otg", based on the OTG status the dwc2 controller
>   internally switches between "host" and "peripheral" mode (selection
>   happens at runtime)
>
> Based on the current mode the regulator has to be enabled or disabled:
> - host: provide power to the connected USB device, thus the regulator
>   has to be enabled
> - peripheral: the host device to which the controller is connected
>   provides power, thus the regulator has to be disabled
>
> Add the dt-bindings documentation for this property so .dts authors know
> that this property exists and how it behaves.
>
> Fixes: 531ef5ebea9639 ("usb: dwc2: add support for host mode external vbus supply")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
gentle ping as I may have sent this when most -next and -fixes trees
were closed (right before the v5.0 release)

it's not a change which is visible at runtime (users don't care) so
it's not urgent.
however, it still adds missing documentation which is useful when
writing .dts files with a dwc2 controller.


Regards
Martin