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

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Date:   Thu, 23 Sep 2021 09:41:46 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Min Li <min.li.xe@...esas.com>
Cc:     "richardcochran@...il.com" <richardcochran@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>
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@...esas.com wrote:  
> > > From: Min Li <min.li.xe@...esas.com>
> > >
> > > 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!