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

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Date:   Wed, 4 Jul 2018 12:16:12 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
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, Jul 4, 2018 at 12:09 PM, Nikolaus Voss
<nikolaus.voss@...wensteinmedical.de> wrote:
> 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.

Okay, IIUC we got a match. What should we do with it? The table is not
used in ->probe_new() (in i2c core), so, you can't say which line
matched there.

-- 
With Best Regards,
Andy Shevchenko