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Date: Tue, 21 Jul 2020 18:34:35 +0800 From: ivan <yanziily@...il.com> To: Greg KH <gregkh@...uxfoundation.org> 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 6:32 PM Greg KH <gregkh@...uxfoundation.org> wrote: > > 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? OK, I will > > thanks, > > greg k-h -- Thanks Qiwu
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