linux-kernel - Re: [PATCH v2 2/8] regulator: max77658: Add ADI MAX77643/54/58/59 Regulator Support

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Date:   Thu, 4 May 2023 12:45:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Arslanbenzer, Zeynep" <Zeynep.Arslanbenzer@...log.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "lee@...nel.org" <lee@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "sre@...nel.org" <sre@...nel.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH v2 2/8] regulator: max77658: Add ADI MAX77643/54/58/59
 Regulator Support

On 04/05/2023 12:36, Arslanbenzer, Zeynep wrote:
> On Tue, 2 May 2023, Krzysztof Kozlowski wrote:
>> On 02/05/2023 08:32, Arslanbenzer, Zeynep wrote:
>>> On Wed, 22 Mar 2023, Krzysztof Kozlowski wrote:
>>>> On 22/03/2023 06:56, Zeynep Arslanbenzer wrote:
>>>>> Regulator driver for ADI MAX77643/MAX77654/MAX77658/MAX77659.
>>>>>
>>>>> MAX77643/MAX77659 has 1 LDO regulator.
>>>>> MAX77654/MAX77658 has two LDO regulators.
>>>>>
>>>>> Signed-off-by: Nurettin Bolucu <Nurettin.Bolucu@...log.com>
>>>>> Signed-off-by: Zeynep Arslanbenzer <Zeynep.Arslanbenzer@...log.com>
>>>>
>>>>
>>>>
>>>>> +
>>>>> +	return 0;
>>>>> +}
>>>>> +
>>>>> +static const struct platform_device_id max77658_regulator_id[] = {
>>>>> +	{ "max77643-regulator" },
>>>>> +	{ "max77654-regulator" },
>>>>> +	{ "max77658-regulator" },
>>>>> +	{ "max77659-regulator" },
>>>>
>>>> Why do you need so many entries? They do not differ.
>>>
>>> They are slightly different. Just MAX77659 and MAX77643 regulators have 
>>> exactly the same features. MAX77659 and MAX77643 have 1 LDO regulator but 
>>> others have 2 and the voltage base of the MAX77654 regulators is different 
>>> from others. Should I use the same entry for the MAX77643 and MAX77659?
>>
>> Your driver does not choose regulators based on these compatibles. Your
>> of_device_id table claims all devices are fully compatible and do not
>> differ from regulators point of view. If they are different, you should
>> encode the difference. If not, use only one entry in of_device_id (only
>> of_device_id, not bindings).
> 
> I used id table matching and I did not use of_device_id table. Should I use 
> OF style match instead?

My comment stands regardless which device ID table you use. It's the
same mechanism.

Best regards,
Krzysztof