linux-kernel - Re: [PATCH v2 2/2] IIO: st_accel_i2c.c: Use probe

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Date:   Wed, 4 Jul 2018 11:09:53 +0200 (CEST)
From:   Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiongfeng Wang <xiongfeng.wang@...aro.org>,
        linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        nv@...n.de
Subject: Re: [PATCH v2 2/2] IIO: st_accel_i2c.c: Use probe_new() instead of
 probe()

On Wed, 4 Jul 2018, Andy Shevchenko wrote:
> On Wed, Jul 4, 2018 at 9:37 AM, Nikolaus Voss
> <nikolaus.voss@...wensteinmedical.de> wrote:
>> On Wed, 4 Jul 2018, Andy Shevchenko wrote:
>>>
>>> On Tue, Jul 3, 2018 at 9:06 AM, Nikolaus Voss
>>> <nikolaus.voss@...wensteinmedical.de> wrote:
>>>>
>>>> struct i2c_device_id argument of probe() is not used, so use probe_new()
>>>> instead.
>>>>
>>>
>>> This makes...
>>>
>>>>  MODULE_DEVICE_TABLE(i2c, st_accel_id_table);
>>>
>>>
>>> ...this table obsolete IIUC. At least that's what I did when switched
>>> to ->probe_new() in some drivers.
>>>
>>> If I'm mistaken (again? :-) ) I would hear from someone to point me
>>> how it can be used after a switch.
>>
>>
>> It is still used by the i2c-core in i2c_device_match() if DT and ACPI
>> matching fails.
>
>> And it is used to create the corresponding modaliases for
>> driver loading.
>
> My question is "How?!"
> I don't really see any points to match against it after switching to
> ->probe_new().
>
> Could you point me to the code path in i2c (or OF?) core for that?

As written above in i2c-core-base.c: i2c_device_match() -> 
i2c_match_id(driver->id_table,...

This is used for driver matching before probe() or probe_new() of the 
device driver can be called. probe_new() actually is a function signature 
change only.

Niko