linux-kernel - Re: [PATCH] mfd: simple-mfd-i2c: Select MFD

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Date:   Tue, 2 Nov 2021 12:37:55 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Michael Walle <michael@...le.cc>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: simple-mfd-i2c: Select MFD_CORE to fix build error

On Tue, Nov 2, 2021 at 12:35 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> On Tue, 02 Nov 2021, Robert Marko wrote:
>
> > On Tue, Nov 2, 2021 at 12:17 PM Lee Jones <lee.jones@...aro.org> wrote:
> > >
> > > On Tue, 02 Nov 2021, Robert Marko wrote:
> > >
> > > > MFD_SIMPLE_MFD_I2C should select the MFD_CORE to a prevent build error:
> > > >
> > > > aarch64-linux-ld: drivers/mfd/simple-mfd-i2c.o: in function `simple_mfd_i2c_probe':
> > > > drivers/mfd/simple-mfd-i2c.c:55: undefined reference to `devm_mfd_add_devices'
> > >
> > > What is your use-case?
> > >
> > > How are you enabling this symbol?
> >
> > Hi Lee,
> > I am adding a symbol like MFD_SL28CPLD does that you can depend on and
> > that simply
> > selects the MFD_SIMPLE_MFD_I2C and I have hit this issue since the
> > MFD_CORE is not selected.
>
> That's interesting.
>
> I wonder how MFD_SL28CPLD selects it?

It doesn't, it just selects MFD_SIMPLE_MFD_I2C

MFD_CORE is probably selected by something else masking this issue.

Regards,
Robert
>
> > > > Fixes: 3abee4579484 ("mfd: Add simple regmap based I2C driver")
> > > > Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> > > > ---
> > > >  drivers/mfd/Kconfig | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > > index 61992edf6a4d..2de69892b631 100644
> > > > --- a/drivers/mfd/Kconfig
> > > > +++ b/drivers/mfd/Kconfig
> > > > @@ -1204,6 +1204,7 @@ config MFD_SI476X_CORE
> > > >  config MFD_SIMPLE_MFD_I2C
> > > >       tristate
> > > >       depends on I2C
> > > > +     select MFD_CORE
> > > >       select REGMAP_I2C
> > > >       help
> > > >         This driver creates a single register map with the intention for it
> > >
> >
> >
> >
>
> --
> Lee Jones [李琼斯]
> Senior Technical Lead - Developer Services
> Linaro.org │ Open source software for Arm SoCs
> Follow Linaro: Facebook | Twitter | Blog



-- 
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@...tura.hr
Web: www.sartura.hr