linux-kernel - Re: [RFT v3 06/14] regulator: max77802: Remove support for board files

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Date:	Thu, 30 Oct 2014 12:50:45 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
CC:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [RFT v3 06/14] regulator: max77802: Remove support for board
 files

Hello Krzysztof,

On 10/30/2014 12:20 PM, Krzysztof Kozlowski wrote:
>  static int max77802_pmic_probe(struct platform_device *pdev)
>  {
>  	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> -	struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
>  	struct max77802_regulator_prv *max77802;
> -	int i, ret = 0, val;
> +	int i, val;
>  	struct regulator_config config = { };
>  
> -	/* This is allocated by the MFD driver */
> -	if (!pdata) {
> -		dev_err(&pdev->dev, "no platform data found for regulator\n");
> -		return -ENODEV;
> -	}
> -
>  	max77802 = devm_kzalloc(&pdev->dev,
>  				sizeof(struct max77802_regulator_prv),
>  				GFP_KERNEL);
>  	if (!max77802)
>  		return -ENOMEM;
>  
> -	if (iodev->dev->of_node) {
> -		ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
> -		if (ret)
> -			return ret;
> +	if (!pdev->dev.of_node) {
> +		/*
> +		 * Backward DTS compatiblity where regulator driver had not
> +		 * a compatible property for itself.
> +		 */
> +		if (!iodev->dev->of_node) {
> +			dev_err(&pdev->dev, "No OF node for driver and its parent\n");
> +			return -EINVAL;
> +		}
> +		pdev->dev.of_node = of_get_child_by_name(iodev->dev->of_node,
> +								"regulators");
> +		max77802->missing_of_node = true;
>  	}

I may be missing something but I don't understand why a compatible string
for the regulators sub-node is needed. Isn't enough to just fill the
.regulators_node field in the struct regulator_desc? e.g:

    .regulators_node = of_match_ptr("regulators") for max77802
    .regulators_node = of_match_ptr("voltage-regulators") for max77686

AFAIU this should be enough for the core to extract the init_data and will
make your change much more simpler and you can drop patches 1-3 and 13-14.

Or maybe I misread the regulator_of_get_init_data() function?

Best regards,
Javier
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