[PATCH v2 01/12] i2c: allow setting the parent device and OF node through the adapter struct

[Andreas Kemnade]

On Mon, 2 Mar 2026 12:38:27 +0200
Kalle Niemi <kaleposti at gmail.com> wrote:

> On 3/2/26 10:55, Bartosz Golaszewski wrote:
> > On Mon, Mar 2, 2026 at 8:47 AM Kalle Niemi <kaleposti at gmail.com> wrote:  
> >> On 2/23/26 11:05, Bartosz Golaszewski wrote:  
> >>> In order to stop i2c bus drivers from dereferencing the struct device
> >>> embedded in struct i2c_adapter, let's allow configuring the parent
> >>> device and OF-node of the adapter directly through dedicated fields.
> >>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski at oss.qualcomm.com>
> >>> ---  
> >> Hello,
> >> Automated driver test system bisected this commit to be the first bad
> >> commit, linux-next next-20260227 was tested. Failed tests include driver
> >> tests for ROHM PMIC and accelerometers, which are connected to
> >> BeagleBone Black.
> >> The failed driver tests all fail to first i2cget and the tests stop
> >> there: "Could not open file '/dev/i2c-2' or 'dev/i2c/2': No such file or
> >> directory".  
> > Wolfram: well, now it would actually be useful to know which commit
> > exactly is the culprit so maybe splitting the changes is not a bad
> > idea after all.
> > Kalle: which i2c bus driver fails here? Any errors in kernel log?
> > Bart  
> 
> Hello Bart,
> 
> i2c-1 and i2c-2 are failing. I am not seeing any i2c errors in kernel log. I got two failures without the dmesg available (this is bugged test sequence, and not a kernel crash), but those got the same stdout message "Could not open file ...." as all others.
> 
Probably I am using the same host driver

tested on OMAP3 DM3730, result: i2c drivers get bound to their devices,
no obvious trouble. But controllers are registered with high indexes.

localhost:~# i2cdetect -l
i2c-3	i2c       	OMAP I2C adapter                	I2C adapter
i2c-4	i2c       	OMAP I2C adapter                	I2C adapter
i2c-5	i2c       	OMAP I2C adapter                	I2C adapter
localhost:~# uname -a
Linux localhost 7.0.0-rc1-next-20260227 #27 SMP Mon Mar  2 11:56:27 CET 2026 armv7l Linux

Regards,
Andreas