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SubjectRe: [PATCH] usb: common: usb-conn-gpio: Register charger
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Hi Paul,

On Wed, 2020-01-08 at 14:26 -0300, Paul Cercueil wrote:
> Hi Greg,
>
>
> Le mer., janv. 8, 2020 at 17:53, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> a écrit :
> > On Tue, Jan 07, 2020 at 01:29:01AM +0100, Paul Cercueil wrote:
> >> Register a power supply charger, whose online state depends on
> >> whether
> >> the USB role is set to device or not.
> >
> > That says _what_ you are doing, but I have no idea _why_ you want to
> > do
> > this.
> >
> > What is this going to cause to have happen? What new userspace api is
> > going to result? What will a user do with this?
>
> This is useful when the USB role is the only way to know if the device
> is charging from USB.
There is no charger IC on your platform?

>
> The API is the standard power supply charger API, you get a
> /sys/class/power_supply/xxx/online node which tells you the state of
> the charger.
>
> The sole purpose of this is to give userspace applications a way to
> know whether or not the charger is plugged.
>
> > Is this going to always show up, no matter if the role is not even
> > relevant for a power supply?
>
> I guess it'd always show up, yes. In which case would the role not be
> relevant for a power supply?
Do you also need it if the platform don't have battery?


> Is gpio-b-connector not always used for
> OTG connectors?
It also supports device only mode, usually uses vBus pin to
enable/disable controller

>
> Cheers,
> -Paul
>
>
> > You need a lot more text here to make this mergable.
> >
> > thanks,
> >
> > greg k-h
>
>

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