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

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Message-ID: <CAE-0n50HR6w-v3ub8HR_K2PsqqTTrVAaQa0pZ7QjY39WmkDyQQ@mail.gmail.com>
Date:   Thu, 14 Apr 2022 17:10:04 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Satya Priya <quic_c_skakit@...cinc.com>
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

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.

> +               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. 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.

> +
>         return devm_of_platform_populate(chip->dev);