linux-kernel - Re: [RFT v2 2/8] regulator: max77802: Remove support for board files

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Message-ID: <54517B37.9010305@collabora.co.uk>
Date:	Thu, 30 Oct 2014 00:41:43 +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 v2 2/8] regulator: max77802: Remove support for board files

Hello Krzysztof,

On 10/29/2014 04:06 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;
>  	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;
> -	}
> +	struct of_regulator_match *rdata;
>  
>  	max77802 = devm_kzalloc(&pdev->dev,
>  				sizeof(struct max77802_regulator_prv),
> @@ -586,24 +558,29 @@ static int max77802_pmic_probe(struct platform_device *pdev)
>  	if (!max77802)
>  		return -ENOMEM;
>  
> -	if (iodev->dev->of_node) {
> -		ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
> -		if (ret)
> -			return ret;
> -	}
> -
>  	config.dev = iodev->dev;
>  	config.regmap = iodev->regmap;
>  	config.driver_data = max77802;
>  	platform_set_drvdata(pdev, max77802);
>  
> +	rdata = kzalloc(sizeof(*rdata) * MAX77802_REG_MAX, GFP_KERNEL);
> +	if (!rdata)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < MAX77802_REG_MAX; i++)
> +		rdata[i].name = regulators[i].name;
> +
> +	ret = max77802_pmic_dt_parse(pdev, rdata);
> +	if (ret)
> +		goto out;
> +
>  	for (i = 0; i < MAX77802_REG_MAX; i++) {
>  		struct regulator_dev *rdev;
> -		int id = pdata->regulators[i].id;
> +		int id = regulators[i].id;
>  		int shift = max77802_get_opmode_shift(id);
>  
> -		config.init_data = pdata->regulators[i].initdata;
> -		config.of_node = pdata->regulators[i].of_node;
> +		config.init_data = rdata[i].init_data;
> +		config.of_node = rdata[i].of_node;
>  
>  		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
>  		val = val >> shift & MAX77802_OPMODE_MASK;
> @@ -621,13 +598,17 @@ static int max77802_pmic_probe(struct platform_device *pdev)
>  		rdev = devm_regulator_register(&pdev->dev,
>  					       &regulators[i], &config);

Thanks for your patch. It's indeed an improvement over the old code and I can
test it tomorrow when I've access to my machine with a max77802 PMIC.

However, I don't think this is the change that Mark asked. AFAIU what he wanted
is to fill the struct regulator_desc .of_match and .regulators_node fields so
the init_data is extracted by the core on regulator registration.

Look at commits a0c7b164 ("regulator: of: Provide simplified DT parsing method")
and 93a127b ("regulator: isl9305: Convert to new style DT parsing") to see what
I'm talking about.

Best regards,
Javier
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