Re: [PATCH v2 6/9] regulator: mt6358: Add support for MT6358 regulator

[Mark Brown]

On Mon, Mar 11, 2019 at 11:46:28AM +0800, Hsin-Hsiung Wang wrote:

> +static const u32 vefuse_voltages[] = {
> +     1700000, 1800000, 1900000,
> +};

This and a bunch of the other regulators look like they're just linear
ranges and could use the linear range helpers.

> +static const u32 vcn33_bt_voltages[] = {
> +     3300000, 3400000, 3500000,
> +};
> +
> +static const u32 vcn33_wifi_voltages[] = {
> +     3300000, 3400000, 3500000,
> +};

These also have the same range so no matter which helpers are used I'd
expect the data to be shared, I think some of the other regulators might
have shared tables but didn't confirm.

> +static inline unsigned int mt6358_map_mode(unsigned int mode)
> +{
> +     return mode == MT6358_BUCK_MODE_FORCE_PWM ?
> +             REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
> +}

Please write normal if statements, it makes the code more readable.

> +static int mt6358_set_voltage_sel(struct regulator_dev *rdev,
> +                               unsigned int selector)
> +{
> +     int idx, ret;
> +     const u32 *pvol;
> +     struct mt6358_regulator_info *info = rdev_get_drvdata(rdev);
> +
> +     pvol = (const u32 *)info->index_table;
> +
> +     idx = pvol[selector];
> +     ret = regmap_update_bits(rdev->regmap, info->desc.vsel_reg,
> +                              info->desc.vsel_mask,
> +                              idx << info->vsel_shift);
> +
> +     return ret;
> +}

This looks like something other devices might do - rather than implement
it in the driver it would be a bit better to add it to helpers.c as a
reusable function.

> +static int mt6358_get_buck_voltage_sel(struct regulator_dev *rdev)
> +{
> +     int ret, regval;
> +     struct mt6358_regulator_info *info = rdev_get_drvdata(rdev);
> +
> +     ret = regmap_read(rdev->regmap, info->da_vsel_reg, &regval);
> +     if (ret != 0) {
> +             dev_info(&rdev->dev,
> +                      "Failed to get mt6358 Buck %s vsel reg: %d\n",
> +                      info->desc.name, ret);
> +             return ret;
> +     }
> +
> +     ret = (regval >> info->da_vsel_shift) & info->da_vsel_mask;
> +
> +     return ret;
> +}

This is just the generic get_voltage_sel() as far as I can see?

> +     /* Read PMIC chip revision to update constraints and voltage table */
> +     if (regmap_read(mt6397->regmap, MT6358_SWCID, &reg_value) < 0) {
> +             dev_err(&pdev->dev, "Failed to read Chip ID\n");
> +             return -EIO;
> +     }

We never use the value we read here?

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