linux-kernel - Re: [PATCH v5 3/4] power: supply: core: add wireless signal strength property

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Message-ID: <20200721103241.GA1675802@kroah.com>
Date:   Tue, 21 Jul 2020 12:32:41 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     ivan <yanziily@...il.com>
Cc:     sre@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jiangfei1@...omi.com,
        Qiwu Huang <huangqiwu@...omi.com>
Subject: Re: [PATCH v5 3/4] power: supply: core: add wireless signal strength
 property

On Tue, Jul 21, 2020 at 06:21:20PM +0800, ivan wrote:
> On Tue, Jul 21, 2020 at 4:19 PM Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > On Tue, Jul 21, 2020 at 01:59:36PM +0800, Qiwu Huang wrote:
> > > From: Qiwu Huang <huangqiwu@...omi.com>
> > >
> > > reports wireless signal strength.
> > > The value show degree of coupling between tx and rx.
> > >
> > > Signed-off-by: Qiwu Huang <huangqiwu@...omi.com>
> > > ---
> > >  Documentation/ABI/testing/sysfs-class-power | 10 ++++++++++
> > >  drivers/power/supply/power_supply_sysfs.c   |  1 +
> > >  include/linux/power_supply.h                |  1 +
> > >  3 files changed, 12 insertions(+)
> > >
> > > diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
> > > index 03ab449fae8a..75ec7de2fe78 100644
> > > --- a/Documentation/ABI/testing/sysfs-class-power
> > > +++ b/Documentation/ABI/testing/sysfs-class-power
> > > @@ -757,3 +757,13 @@ Description:
> > >                       13: ADAPTER_VOICE_BOX,
> > >                       14: ADAPTER_PRIVATE_PD_50W.
> > >
> > > +What:                /sys/class/power_supply/<supply_name>/signal_strength
> > > +Date:                Jul 2020
> > > +Contact:     Fei Jiang <jiangfei1@...omi.com>
> > > +Description:
> > > +             In PING phase, RX transmits a signal strength packet as the first
> >
> > What does "PING phase" mean?
> 
> The Qi Wireless Power Transfer System is published by the Wireless
> Power Consortium.
> The ping phase is the necessary stage for matching transmitter and
> receiver. In this phase,
> the Power Transmitter executes a Digital Ping, and listens for a
> response. If the
> Power Transmitter discovers a Power Receiver, the Power Transmitter
> may extend the Digital Ping,
> i.e. maintain the Power Signal at the level of the Digital Ping. This
> causes the system to proceed to the
> identification & configuration phase. If the Power Transmitter does
> not extend the Digital Ping, the
> system shall revert to the selection phase.

Thanks for the description, so perhaps turning this response into the
text in the description would be good?

thanks,

greg k-h