linux-kernel - Re: [PATCH] usb: dwc3: fix build error when POWER

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Date:   Tue, 23 Mar 2021 14:47:15 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ray Chi <raychi@...gle.com>
Cc:     Sebastian Reichel <sre@...nel.org>, naresh.kamboju@...aro.org,
        Kyle Tso <kyletso@...gle.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: Re: [PATCH] usb: dwc3: fix build error when POWER_SUPPLY is not
 enabled

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@...nel.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@...aro.org>
> > > Signed-off-by: Ray Chi <raychi@...gle.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