RE: [PATCH net-next] ptp: clockmatrix: use rsmu driver to access i2c/spi bus

[Min Li]

> -----Original Message-----
> From: Jakub Kicinski <kuba@xxxxxxxxxx>
> Sent: September 23, 2021 12:42 PM
> To: Min Li <min.li.xe@xxxxxxxxxxx>
> Cc: richardcochran@xxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; lee.jones@xxxxxxxxxx
> Subject: Re: [PATCH net-next] ptp: clockmatrix: use rsmu driver to access
> i2c/spi bus
> 
> On Thu, 23 Sep 2021 16:29:44 +0000 Min Li wrote:
> > > On Wed, 22 Sep 2021 09:57:14 -0400 min.li.xe@xxxxxxxxxxx wrote:
> > > > From: Min Li <min.li.xe@xxxxxxxxxxx>
> > > >
> > > > rsmu (Renesas Synchronization Management Unit ) driver is located
> > > > in drivers/mfd and responsible for creating multiple devices
> > > > including clockmatrix phc, which will then use the exposed regmap
> > > > and mutex handle to access i2c/spi bus.
> > >
> > > Does not build on 32 bit. You need to use division helpers.
> >
> > Hi Jakub
> >
> > I did build it through 32 bit arm and didn't get the problem.
> >
> > make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
> 
> We're testing x86, maybe arm32 can handle 64bit divisions natively?
> 
> ERROR: modpost: "__divdi3" [drivers/ptp/ptp_clockmatrix.ko] undefined!
> ERROR: modpost: "__udivdi3" [drivers/ptp/ptp_clockmatrix.ko] undefined!

Hi Jakub

I tried "make ARCH=i386" but it also passed on my machine. Can you tell me how to
reproduce this? Thanks

Min