linux-kernel - Re: [PATCH 2/4] regulator: Add driver for MT6331 PMIC regulators

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Date:   Fri, 20 May 2022 15:45:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     lgirdwood@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/4] regulator: Add driver for MT6331 PMIC regulators

On Fri, May 20, 2022 at 03:33:03PM +0200, AngeloGioacchino Del Regno wrote:

> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022 Collabora Ltd.
> + * Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> + *

Please make the entire comment a C++ one so things look more
intentional.

> +static const unsigned int ldo_volt_table10[] = {
> +	1200000, 1300000, 1500000, 1800000,
> +	1200000, 1300000, 1500000, 1800000,
> +	1200000, 1300000, 1500000, 1800000,
> +	1200000, 1300000, 1500000, 1800000,
> +};

So the top bits of the voltate selection field just get ignored?  Might
be easier to just write the code to not include the top bits.

> +static int mt6331_get_status(struct regulator_dev *rdev)
> +{
> +	struct mt6331_regulator_info *info = rdev_get_drvdata(rdev);
> +	u32 reg, en_mask, regval;
> +	int ret;
> +
> +	if (info->qi > 0) {
> +		reg = info->desc.enable_reg;
> +		en_mask = info->qi;

If the regulator doesn't have status readback it shouldn't provide a
get_status() operation.

> +static int mt6331_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
> +{
> +	int ret, val = 0;
> +	struct mt6331_regulator_info *info = rdev_get_drvdata(rdev);
> +
> +	if (!info->modeset_mask) {
> +		dev_err(&rdev->dev, "regulator %s doesn't support set_mode\n",
> +			info->desc.name);
> +		return -EINVAL;
> +	}

Just don't provide the operation for these regulators then.  That'll
mean a separate ops struct but that's fine.

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