linux-kernel - Re: [PATCH V10 4/9] mfd: pm8008: Add reset-gpios

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Date:   Mon, 18 Apr 2022 10:34:26 +0530
From:   "Satya Priya Kakitapalli (Temp)" <quic_c_skakit@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_collinsd@...cinc.com>,
        <quic_subbaram@...cinc.com>, <quic_jprakash@...cinc.com>
Subject: Re: [PATCH V10 4/9] mfd: pm8008: Add reset-gpios


On 4/15/2022 5:40 AM, Stephen Boyd wrote:
> Quoting Satya Priya (2022-04-14 05:30:13)
>> diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
>> index c472d7f..97a72da 100644
>> --- a/drivers/mfd/qcom-pm8008.c
>> +++ b/drivers/mfd/qcom-pm8008.c
>> @@ -239,6 +241,13 @@ static int pm8008_probe(struct i2c_client *client)
>>                          dev_err(chip->dev, "Failed to probe irq periphs: %d\n", rc);
>>          }
>>
>> +       chip->reset_gpio = devm_gpiod_get(chip->dev, "reset", GPIOD_OUT_HIGH);
>> +       if (IS_ERR(chip->reset_gpio)) {
>> +               dev_err(chip->dev, "failed to acquire reset gpio\n");
> The API looks to print debug messages. This print doesn't look required.


Okay.


>> +               return PTR_ERR(chip->reset_gpio);
>> +       }
>> +       gpiod_set_value(chip->reset_gpio, 1);
> Does this do anything? Does this work just as well?
>
> 	reset_gpio = devm_gpiod_get(chip->dev, "reset", GPIOD_OUT_LOW);
> 	if (IS_ERR(reset_gpio))
> 		return PTR_ERR(reset_gpio);
>
> Note that there's no point to store the reset gpio in the structure if
> it won't be used outside of probe.


Okay, I'll use a local variable.


> This should work fine? I used
> GPIOD_OUT_LOW to indicate that the reset should be returned to this
> function deasserted, i.e. taking the PMIC out of reset.


I'll try this out.