linux-kernel - Re: [PATCH v4 2/4] power_supply: Add additional health properties to the header

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Message-ID: <20200310213050.si7gcr2wbmjgr7jf@earth.universe>
Date:   Tue, 10 Mar 2020 22:30:50 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sandeep Patil <sspatil@...roid.com>
Cc:     Dan Murphy <dmurphy@...com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v4 2/4] power_supply: Add additional health properties to
 the header

Hi Sandeep,

On Fri, Mar 06, 2020 at 03:55:48PM -0800, Sandeep Patil wrote:
> On Fri, Jan 17, 2020 at 02:06:58AM +0100, Sebastian Reichel wrote:
> > Hi,
> > 
> > On Thu, Jan 16, 2020 at 11:50:37AM -0600, Dan Murphy wrote:
> > > Add HEALTH_WARM, HEALTH_COOL and HEALTH_HOT to the health enum.
> > > 
> > > Signed-off-by: Dan Murphy <dmurphy@...com>
> > > ---
> > 
> > Looks good. But I will not merge it without a user and have comments
> > for the driver.
> 
> Android has been looking for these properties for a while now [1].
> It was added[2] when we saw that the manufacturers were implementing these
> properties in the driver. I didn't know the properties were absent upstream
> until yesterday. Somebody pointed out in our ongoing effort to make sure
> all core kernel changes that android depends on are present upstream.
> 
> I think those values are also propagated in application facing APIs in
> Android (but I am not sure yet, let me know if that's something you want
> to find out).
> 
> I wanted to chime in and present you a 'user' for this if that helps.

With user I meant an upstream kernel driver, which exposes the
values. But thanks for the pointer. This should be mentioned in
the patch description, also the fact that the status values are
directly taken from JEITA spec.

> Cc: kernel-team@...roid.com
> 
> - ssp
> 
> 1. https://android.googlesource.com/platform/system/core/+/refs/heads/master/healthd/BatteryMonitor.cpp#162
> 2. https://android-review.googlesource.com/c/platform/system/core/+/414481

-- Sebastian

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