linux-kernel - RE: [PATCH v3 3/5] drivers: regulator: Add ADI MAX77541/MAX77540 Regulator Support

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Date:   Tue, 31 Jan 2023 09:27:48 +0000
From:   "Sahin, Okan" <Okan.Sahin@...log.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.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>,
        ChiYuan Huang <cy_huang@...htek.com>,
        "Bolboaca, Ramona" <Ramona.Bolboaca@...log.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        William Breathitt Gray <william.gray@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: RE: [PATCH v3 3/5] drivers: regulator: Add ADI MAX77541/MAX77540
 Regulator Support


Hi Andy,

Sorry for second question. I do not want to bother you, but I realized that I need to be sure about driver_data before sending new patch. You said that you need to use pointers directly for driver_data then I fixed that part in mfd, but I do not need or  use driver_data in regulator since chip_id comes from mfd device so I think using like below should be enough for my implementation.

static const struct platform_device_id max77541_regulator_platform_id[] = {
	{ "max77540-regulator", },
	{ "max77541-regulator", },
	{  /* sentinel */  }
};
MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);

static const struct of_device_id max77541_regulator_of_id[] = {
	{ .compatible = "adi,max77540-regulator", },
	{ .compatible = "adi,max77541-regulator", },
	{ /* sentinel */  }
};
MODULE_DEVICE_TABLE(of, max77541_regulator_of_id);

What do you think?

On Tue, Jan 31, 2023 at 10:21 AM +0300, Okan Sahin wrote:

>Hi Andy,
>
>Thank you for your feedback and efforts. I have a question below.
>
>On Wed, 18 Jan 2022 11:20 AM
>Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
>
>>On Wed, Jan 18, 2023 at 09:38:10AM +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.
>>
>>...
>>
>>> + * Copyright (c) 2022 Analog Devices, Inc.
>>
>>Happy New Year!
>>
>>...
>>
>>> +static int max77541_regulator_probe(struct platform_device *pdev) {
>>> +	struct max77541 *max77541 = dev_get_drvdata(pdev->dev.parent);
>>> +	struct regulator_config config = {};
>>> +	const struct regulator_desc *desc;
>>> +	struct device *dev = &pdev->dev;
>>
>>You may rearrange this a bit
>>
>>	struct max77541 *max77541 = dev_get_drvdata(dev->parent);
>>
>>> +	struct regulator_dev *rdev;
>>> +	int i;
>>
>>> +	config.dev = pdev->dev.parent;
>>
>>dev->parent
>>
>>> +
>>> +	if (max77541->id == MAX77540)
>>> +		desc = max77540_regulators_desc;
>>> +	else if (max77541->id == MAX77541)
>>> +		desc = max77541_regulators_desc;
>>> +	else
>>> +		return -EINVAL;
>>> +
>>> +	for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
>>
>>> +		rdev = devm_regulator_register(dev,
>>> +					       &desc[i], &config);
>>
>>This is perfectly one line.
>Thank you, I will arrange it.
>>
>>> +		if (IS_ERR(rdev))
>>> +			return dev_err_probe(dev, PTR_ERR(rdev),
>>> +					     "Failed to register regulator\n");
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>
>>...
>However, this one is not fit when I set max-line-length argument as 80 in
>checkpatch script. What do you suggest? This line has 99 characters.
>>
>>> +static const struct of_device_id max77541_regulator_of_id[] = {
>>> +	{
>>> +		.compatible = "adi,max77540-regulator",
>>> +		.data = (void *)MAX77540,
>>> +	},
>>> +	{
>>> +		.compatible = "adi,max77541-regulator",
>>> +		.data = (void *)MAX77541,
>>> +	},
>>> +	{ /* sentinel */  }
>>
>>As pointed out, better to use pointers directly.
>>
>>> +};
>>
>>--
>>With Best Regards,
>>Andy Shevchenko
>>
>
>Regards,
>Okan Sahin

Regards,
Okan