linux-kernel - Re: [PATCH v1 2/2] hwmon: ina2xx: add optional regulator support

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Message-ID: <70325083-25B9-434F-9F48-9EE7AE28B550@gmail.com>
Date:   Wed, 08 Mar 2023 13:19:51 +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 2/2] hwmon: ina2xx: add optional regulator support



8 березня 2023 р. 13:13:18 GMT+02:00, Guenter Roeck <linux@...ck-us.net> написав(-ла):
>On 3/8/23 02:35, Svyatoslav Ryhel wrote:
>> ср, 8 бер. 2023 р. о 12:25 Krzysztof Kozlowski
>> <krzysztof.kozlowski@...aro.org> пише:
>>> 
>>> On 08/03/2023 10:40, Svyatoslav Ryhel wrote:
>>>> Some devices may need a specific supply provided
>>>> for this sensor to work properly, like p895 does.
>>>> 
>>>> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
>>>> ---
>>>>   drivers/hwmon/ina2xx.c | 12 ++++++++++++
>>>>   1 file changed, 12 insertions(+)
>>>> 
>>>> diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
>>>> index 00fc70305a89..4a3e2b1bbe8b 100644
>>>> --- a/drivers/hwmon/ina2xx.c
>>>> +++ b/drivers/hwmon/ina2xx.c
>>>> @@ -119,6 +119,7 @@ struct ina2xx_data {
>>>>        long power_lsb_uW;
>>>>        struct mutex config_lock;
>>>>        struct regmap *regmap;
>>>> +     struct regulator *vdd_supply;
>>>> 
>>>>        const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
>>>>   };
>>>> @@ -656,6 +657,17 @@ static int ina2xx_probe(struct i2c_client *client)
>>>>                return PTR_ERR(data->regmap);
>>>>        }
>>>> 
>>>> +     data->vdd_supply = devm_regulator_get_optional(dev, "vdd");
>>>> +     if (IS_ERR(data->vdd_supply))
>>>> +             return dev_err_probe(dev, PTR_ERR(data->vdd_supply),
>>>> +                                  "failed to get vdd regulator\n");
>>>> +
>>>> +     ret = regulator_enable(data->vdd_supply);
>>>> +     if (ret < 0) {
>>>> +             dev_err(dev, "failed to enable vdd power supply\n");
>>>> +             return ret;
>>> 
>>> And where is disable? On each error path, removal etc.
>>> 
>> 
>> error path ok, should I create a remove function just to disable the regulator?
>> 
>Use devm_add_action_or_reset().
>
>Guenter
>

That is good suggestion. Thanks!

Best regards,
Svyatoslav R.

>>> Best regards,
>>> Krzysztof
>>> 
>