linux-kernel - Re: [PATCH v1 1/2] dt-bindings: hwmon: ina2xx: add supply property

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Date:   Wed, 08 Mar 2023 13:54:14 +0200
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Jean Delvare <jdelvare@...e.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: hwmon: ina2xx: add supply property



8 березня 2023 р. 13:35:46 GMT+02:00, Guenter Roeck <linux@...ck-us.net> написав(-ла):
>On 3/8/23 02:32, Svyatoslav Ryhel wrote:
>> ср, 8 бер. 2023 р. о 12:27 Krzysztof Kozlowski
>> <krzysztof.kozlowski@...aro.org> пише:
>>> 
>>> On 08/03/2023 10:40, Svyatoslav Ryhel wrote:
>>>> Add supply property.
>>> 
>>> You have entire commit msg to explain and give background, but instead
>>> there is just sentence duplicating subject. And since you did not
>>> explain anything, we have questions... like: INA238 does not have VDD,
>>> so this does not look correct.
>>> 
>> 
>> This is why a regulator is not mandatory. If ina238 does not have vdd
>> then one who needs ina238 may omit this prop. How about looking from
>> this perspective?
>> 
>
>If a chip does not have VDD, the driver should not even try to get it
>for that chip. INS238 is supported by a different driver, so that does
>not require special code, but it needs to be spelled out in the devicetree
>bindings. Devicetree has a means to specify if a property is valid for
>a given device.
>
>Having said this, as it turns out, _none_ of the chips supported by
>the ina2xx and the ina238 drivers have VDD. All of them have Vs, and
>all but INA219 have Vbus. The bindings don't even explain which one
>of those is supposed to refer to "VDD".
>

So you refer to vdd as to a real name. Now I understand this misunderstand. Regulator I am interested in is Vs. Since you confirmed that Vs is supported by all ina2xx there should be no contraversions further.

>Also, regulator_get_optional() returns -ENODEV if CONFIG_REGULATOR
>is not enabled, so it isn't entirely optional. We can not suddenly fail
>to load the driver on systems with CONFIG_REGULATOR=n, so some conditional
>code will unfortunately be necessary.
>
>Guenter
>

Hm, then Lars-Peter Clausen suggestion should be applicable in this case.

>>> 
>>> Best regards,
>>> Krzysztof
>>> 
>> 
>> Best regards,
>> Svyatoslav R.
>