linux-kernel - Re: [PATCH V5 3/6] mfd: pm8008: Add mfd cell struct to register LDOs

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Date:   Wed, 9 Feb 2022 17:32:05 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        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>,
        Das Srinagesh <gurus@...eaurora.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 V5 3/6] mfd: pm8008: Add mfd cell struct to register LDOs

Quoting Satya Priya (2022-02-08 06:52:17)
> diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
> index c472d7f..e8569cc 100644
> --- a/drivers/mfd/qcom-pm8008.c
> +++ b/drivers/mfd/qcom-pm8008.c
> @@ -8,6 +8,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
>  #include <linux/irqdomain.h>
> +#include <linux/mfd/core.h>
>  #include <linux/module.h>
>  #include <linux/of_device.h>
>  #include <linux/of_platform.h>
> @@ -27,6 +28,37 @@
>  #define INT_EN_CLR_OFFSET              0x16
>  #define INT_LATCHED_STS_OFFSET         0x18
>
> +static const struct mfd_cell pm8008_regulator_devs[] = {

Is there some way to not allocate this structure statically forever?

> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 0,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 1,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 2,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 3,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 4,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 5,
> +       },
> +       {
> +               .name = "qcom,pm8008-regulators",
> +               .id = 6,
> +       },
> +};
> +
>  enum {
>         PM8008_MISC,
>         pm8008_temp_alarm,
> @@ -35,6 +67,17 @@ enum {
>         PM8008_NUM_PERIPHS,
>  };
>
> +enum {
> +       PM8008_INFRA,
> +       PM8008_REGULATORS,
> +};
> +
> +static const struct of_device_id pm8008_match[] = {
> +       { .compatible = "qcom,pm8008", .data = (void *)PM8008_INFRA},
> +       { .compatible = "qcom,pm8008-regulators", .data = (void *)PM8008_REGULATORS},
> +       { },

Nitpick: Drop , on {} so nothing can come after without causing compile
error.

> +};
> +
>  #define PM8008_PERIPH_0_BASE   0x900
>  #define PM8008_PERIPH_1_BASE   0x2400
>  #define PM8008_PERIPH_2_BASE   0xC000
> @@ -221,6 +264,7 @@ static int pm8008_probe(struct i2c_client *client)
>  {
>         int rc;
>         struct pm8008_data *chip;
> +       const struct of_device_id *id;
>
>         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
>         if (!chip)
> @@ -239,14 +283,19 @@ static int pm8008_probe(struct i2c_client *client)
>                         dev_err(chip->dev, "Failed to probe irq periphs: %d\n", rc);
>         }
>
> +       id = of_match_node(pm8008_match, chip->dev->of_node);

Use device_get_match_data()? And then use (uintptr_t) casts to check for
the enum? Using device_get_match_data() allows us to avoid moving the
pm8008_match table.

> +       if (id->data == (void *)PM8008_REGULATORS) {

	enum <your_name_here> dev_type = device_get_match_data(dev);

	if (dev_type == PM8008_REGULATORS)

> +               rc = mfd_add_devices(chip->dev, 0, pm8008_regulator_devs,

Why not devm_mfd_add_devices()?

> +                               ARRAY_SIZE(pm8008_regulator_devs), NULL, 0, NULL);
> +               if (rc) {
> +                       dev_err(chip->dev, "Failed to add children: %d\n", rc);
> +                       return rc;
> +               }
> +       }
> +
>         return devm_of_platform_populate(chip->dev);
>  }
>
> -static const struct of_device_id pm8008_match[] = {
> -       { .compatible = "qcom,pm8008", },
> -       { },
> -};

This should have a MODULE_DEVICE_TABLE(of, pm8008_match) here.

> -
>  static struct i2c_driver pm8008_mfd_driver = {
>         .driver = {
>                 .name = "pm8008",