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

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Message-ID: <2e1159d3-f4a6-22ec-ccb5-96f6c07a4e7f@linaro.org>
Date:   Wed, 8 Mar 2023 11:37:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Svyatoslav Ryhel <clamor95@...il.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        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

On 08/03/2023 11:35, 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?

Unbind device. Then bind. Then unbind. Then check regulator status
(/sys/kernel/debug). Do you have the answer now?

Best regards,
Krzysztof