linux-kernel - Re: [PATCH] mfd: sec: Export OF module alias table

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Date:   Tue, 7 Aug 2018 11:21:41 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Javier Martinez Canillas <javier@...hile0.org>
Cc:     Sangbeom Kim <sbkim73@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH] mfd: sec: Export OF module alias table

On 4 August 2018 at 01:30, Javier Martinez Canillas <javier@...hile0.org> wrote:
> Hi Krzysztof,
>
> On Wed, Jul 25, 2018 at 5:53 PM, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>> In case of Device Tree platforms, even though the Samsung PMIC sec
>> device is instantiated from DT, the driver is still matched through I2C
>> module alias.  That is because I2C core always reports an I2C module
>> alias instead of DT one.
>>
>
> Just a heads up that this already changed in v4.17 since commit
> af503716ac1 ("i2c: core: report OF style module alias for devices
> registered via OF").

True, I missed that part and blindly followed the old principle.

>
>> This could change in the future so export DT module alias.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>> ---
>>  drivers/mfd/sec-core.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
>> index ca6b80d08ffc..9613b4257302 100644
>> --- a/drivers/mfd/sec-core.c
>> +++ b/drivers/mfd/sec-core.c
>> @@ -146,6 +146,7 @@ static const struct of_device_id sec_dt_match[] = {
>>                 /* Sentinel */
>>         },
>>  };
>> +MODULE_DEVICE_TABLE(of, sec_dt_match);
>
> This driver can't be built as a module since its config symbol is
> bool, so technically this macro isn't needed. But it's a no-op when
> the driver is built-in so it's harmless to have it.

Indeed. I tried converting it to module but that does not work in all
configurations (regulators are needed early).

Anyway my patch even though not that correct, it should not bring any issues.

Thanks for valuable feedback!

Best regards,
Krzysztof