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SubjectRe: [PATCH v3 07/10] regulator: mt6358: Add support for MT6358 regulator
On Fri, May 03, 2019 at 05:31:14PM +0800, Hsin-Hsiung Wang wrote:

A few fairly minor things but mostly this looks good.

> +static const u32 vcama1_voltages[] = {
> + 1800000, 2500000, 2700000,
> + 2800000, 2900000, 3000000,
> +};

> +static const u32 vcama2_voltages[] = {
> + 1800000, 2500000, 2700000,
> + 2800000, 2900000, 3000000,
> +};
> +

These two tables look the same?

> +static int mt6358_get_voltage_sel(struct regulator_dev *rdev)
> +{
> + int idx, ret;
> + u32 selector;
> + struct mt6358_regulator_info *info = rdev_get_drvdata(rdev);
> + const u32 *pvol;
> +
> + ret = regmap_read(rdev->regmap, info->desc.vsel_reg, &selector);
> + if (ret != 0) {
> + dev_info(&rdev->dev,
> + "Failed to get mt6358 %s vsel reg: %d\n",
> + info->desc.name, ret);
> + return ret;
> + }
> +
> + selector = (selector & info->desc.vsel_mask) >> info->vsel_shift;
> + pvol = (const u32 *)info->index_table;
> + ret = -1;
> + for (idx = 0; idx < info->desc.n_voltages; idx++) {
> + if (pvol[idx] == selector) {
> + ret = idx;
> + break;
> + }
> + }
> +
> + return ret;
> +}

I don't entirely understand what this is intended to do which suggests
it could use some comments. As far as I can tell it's looking up the
hardware selector in a table and then using the index of the entry in
that table as the selector in order to deal with a sparse set of
selectors, is that right? You should be able to handle this by having
_list_voltage() return an error code for the invalid selectors though we
don't have helpers for that yet as it's an unusual design.

Also -1 is not a good return value in the case where you fail to do a
mapping, use -EINVAL.

> + 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;
> + }

These error messages should be dev_err().
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