linux-kernel - Re: [PATCH v5 2/5] regulator: max77541: Add ADI MAX77541/MAX77540 Regulator Support

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Message-ID: <Y/S2pTZzzHCQzNY3@smile.fi.intel.com>
Date:   Tue, 21 Feb 2023 14:18:45 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Okan Sahin <okan.sahin@...log.com>
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Marcelo Schmitt <marcelo.schmitt1@...il.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        William Breathitt Gray <william.gray@...aro.org>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH v5 2/5] regulator: max77541: Add ADI MAX77541/MAX77540
 Regulator Support

On Tue, Feb 21, 2023 at 01:39:10PM +0300, Okan Sahin wrote:
> Regulator driver for both MAX77541 and MAX77540.
> The MAX77541 is a high-efficiency step-down converter
> with two 3A switching phases for single-cell Li+ battery
> and 5VDC systems.
> 
> The MAX77540 is a high-efficiency step-down converter
> with two 3A switching phases.

...

> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022 Analog Devices, Inc.
> + * ADI Regulator driver for the MAX77540 and MAX77541
> + */

Dunno if Mark requires // comments for regulator new code.

...

> +#include <linux/i2c.h>

Is there any user of this?

...

> +static int max77541_regulator_probe(struct platform_device *pdev)
> +{
> +	struct regulator_config config = {};
> +	const struct regulator_desc *desc;
> +	struct device *dev = &pdev->dev;
> +	struct regulator_dev *rdev;
> +	struct max77541 *max77541;

> +	int i;

unsigned ?

> +	max77541 = dev_get_drvdata(dev->parent);

Can be done in definition block (but it's up to you):

	struct regulator_config config = {};
	const struct regulator_desc *desc;
	struct device *dev = &pdev->dev;
	struct max77541 *max77541 = dev_get_drvdata(dev->parent);
	struct regulator_dev *rdev;
	unsigned int i;

> +	config.dev = dev->parent;
> +
> +	switch (max77541->chip->id) {
> +	case MAX77540:
> +		desc = max77540_regulators_desc;
> +		break;
> +	case MAX77541:
> +		desc = max77541_regulators_desc;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
> +		rdev = devm_regulator_register(dev, &desc[i], &config);
> +		if (IS_ERR(rdev))
> +			return dev_err_probe(dev, PTR_ERR(rdev),
> +					     "Failed to register regulator\n");
> +	}
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko