From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Paul Cercueil <paul@crapouillou.net>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>,
od@zcrc.me, linux-usb@vger.kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] usb: common: usb-conn-gpio: Register charger
Date: Wed, 8 Jan 2020 18:58:34 +0100 [thread overview]
Message-ID: <20200108175834.GC2546185@kroah.com> (raw)
In-Reply-To: <1578504370.3.1@crapouillou.net>
On Wed, Jan 08, 2020 at 02:26:10PM -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.
>
> 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.
Ok, this is all good info that should go into the changelog text for
when you resend this.
> > 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? Is gpio-b-connector not always used for OTG
> connectors?
I do not know, I thought OTG was dead :)
thanks,
greg k-h
next prev parent reply other threads:[~2020-01-08 17:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-07 0:29 [PATCH] usb: common: usb-conn-gpio: Register charger Paul Cercueil
2020-01-08 16:53 ` Greg Kroah-Hartman
2020-01-08 17:26 ` Paul Cercueil
2020-01-08 17:58 ` Greg Kroah-Hartman [this message]
2020-01-09 2:27 ` Chunfeng Yun
2020-01-14 15:15 ` Paul Cercueil
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