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From:   Ray Chi <raychi@google.com>
Date:   Tue, 23 Mar 2021 22:24:25 +0800
Message-ID: <CAPBYUsCo4p+4qy551+3=3PXmnKR96K6qN+CP=Y7sjKGwpemXSw@mail.gmail.com>
Subject: Re: [PATCH] usb: dwc3: fix build error when POWER_SUPPLY is not enabled
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Sebastian Reichel <sre@kernel.org>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        Kyle Tso <kyletso@google.com>, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Badhri Jagan Sridharan <badhri@google.com>
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Hi Greg,

I will upload fixes for power supply usage in dwc3 and dt-binding
documentation for the new device tree this week.

Thanks,
Ray

On Tue, Mar 23, 2021 at 9:47 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Fri, Mar 12, 2021 at 09:57:56PM +0800, Ray Chi wrote:
> > Hi Sebastian,
> >
> > Sorry for the late reply.
> >
> > On Wed, Mar 10, 2021 at 2:58 AM Sebastian Reichel <sre@kernel.org> wrote:
> > >
> > > Hi,
> > >
> > > On Mon, Mar 08, 2021 at 09:31:46PM +0800, Ray Chi wrote:
> > > > Fix build error when CONFIG_POWER_SUPPLY is not enabled.
> > > >
> > > > The build error occurs in mips (cavium_octeon_defconfig).
> > > >
> > > > mips-linux-gnu-ld: drivers/usb/dwc3/core.o: in function `dwc3_remove':
> > > > drivers/usb/dwc3/core.c:1657: undefined reference to `power_supply_put'
> > > > mips-linux-gnu-ld: drivers/usb/dwc3/core.o: in function `dwc3_get_properties':
> > > > drivers/usb/dwc3/core.c:1270: undefined reference to `power_supply_get_by_name'
> > > > mips-linux-gnu-ld: drivers/usb/dwc3/core.o: in function `dwc3_probe':
> > > > drivers/usb/dwc3/core.c:1632: undefined reference to `power_supply_put'
> > > >
> > > > Fixes: 59fa3def35de ("usb: dwc3: add a power supply for current control")
> > > > Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> > > > Signed-off-by: Ray Chi <raychi@google.com>
> > > > ---
> > >
> > > While I'm fine with merging this after fixing up the subject, the
> > > original patch for dwc3 [0] looks completly incorrect to me.
> > >
> > > First of all it uses wrong scale (power-supply uses uA, not mA),
> > > so you are charging 1000x slower than expected. Then the patchset
> > > introduces a new DT property to get the power-supply device, but
> > > does not update the DT binding documentation and does not Cc the
> > > DT binding maintainer.
> >
> > Yes, it should use uA and send this information, and I will update a
> > patch to fix it and add the DT binding documentation.
>
> So should I revert what we currently have in my usb-next tree, or do
> you have a fix for this?
>
> thanks,
>
> greg k-h