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

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Date:   Tue, 2 May 2023 08:36:28 +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 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?

Wrap your email replies, it's difficult to read and reply.

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).

Best regards,
Krzysztof