linux-kernel - Re: [PATCH v4 6/7] regulator: axp20x: make use of devm_regulator_set

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Message-ID: <20140617204657.GE19730@lukather>
Date:	Tue, 17 Jun 2014 22:46:57 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Carlo Caione <carlo@...one.org>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH v4 6/7] regulator: axp20x: make use of
 devm_regulator_set_register

On Tue, Jun 17, 2014 at 09:38:42AM +0200, Boris BREZILLON wrote:
> Make use of the devm_regulator_set_register instead of registering each
> regulator provided by the PMIC.
> 
> This also solves a self dependency issue where one regulator of the PMIC
> is used as a supply for anoher regulator provided by the same PMIC.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> ---
>  drivers/regulator/axp20x-regulator.c | 59 ++++++++++++++----------------------
>  1 file changed, 23 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c
> index d42bf6d..e8f0df7 100644
> --- a/drivers/regulator/axp20x-regulator.c
> +++ b/drivers/regulator/axp20x-regulator.c
> @@ -301,66 +301,53 @@ static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 work
>  
>  static int axp20x_regulator_probe(struct platform_device *pdev)
>  {
> -	struct regulator_dev *rdev;
> +	struct regulator_set *rset;
>  	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
> -	struct regulator_config config = { };
> -	struct regulator_init_data *init_data;
> +	struct regulator_set_config config;
>  	struct of_regulator_match *matches;
> -	int nmatches;
> -	const struct regulator_desc *regulators;
> -	int nregulators;
>  	int ret, i;
>  	u32 workmode;
>  
> +	memset(&config, 0, sizeof(config));
> +	config.dev = &pdev->dev;
> +	config.regmap = axp20x->regmap;
>  	if (axp20x->variant == AXP221_ID) {
>  		matches = axp22x_matches;
> -		nmatches = ARRAY_SIZE(axp22x_matches);
> -		regulators = axp22x_regulators;
> -		nregulators = AXP22X_REG_ID_MAX;
> +		config.descs = axp22x_regulators;
> +		config.nregulators = AXP22X_REG_ID_MAX;
>  	} else {
>  		matches = axp20x_matches;
> -		nmatches = ARRAY_SIZE(axp20x_matches);
> -		regulators = axp20x_regulators;
> -		nregulators = AXP20X_REG_ID_MAX;
> +		config.descs = axp20x_regulators;
> +		config.nregulators = AXP20X_REG_ID_MAX;
>  	}
> +	config.matches = matches;
>  
>  	/*
>  	 * Reset matches table (this table might have been modified by a
>  	 * previous AXP2xx device probe).
>  	 */
> -	for (i = 0; i < nmatches; i++) {
> +	for (i = 0; i < config.nregulators; i++) {
>  		matches[i].init_data = NULL;
>  		matches[i].of_node = NULL;
>  	}
>  
> -	ret = axp20x_regulator_parse_dt(pdev, matches, nmatches);
> +	ret = axp20x_regulator_parse_dt(pdev, matches,
> +					config.nregulators);
>  	if (ret)
>  		return ret;
>  
> -	for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
> -		init_data = matches[i].init_data;
> +	rset = devm_regulator_set_register(&pdev->dev, &config);
> +	if (IS_ERR(rset))
> +		return PTR_ERR(rset);
>  
> -		config.dev = &pdev->dev;
> -		config.init_data = init_data;
> -		config.regmap = axp20x->regmap;
> -		config.of_node = matches[i].of_node;
> -
> -		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
> -					       &config);
> -		if (IS_ERR(rdev)) {
> -			dev_err(&pdev->dev, "Failed to register %s\n",
> -				regulators[i].name);
> -
> -			return PTR_ERR(rdev);
> -		}
> -
> -		ret = of_property_read_u32(matches[i].of_node, "x-powers,dcdc-workmode",
> +	for (i = 0; i < rset->nregulators; i++) {
> +		ret = of_property_read_u32(config.matches[i].of_node,
> +					   "x-powers,dcdc-workmode",
>  					   &workmode);
> -		if (!ret) {
> -			if (axp20x_set_dcdc_workmode(rdev, i, workmode))
> -				dev_err(&pdev->dev, "Failed to set workmode on %s\n",
> -					regulators[i].name);
> -		}
> +		if (!ret &&
> +		    axp20x_set_dcdc_workmode(rset->regulators[i], i, workmode))
> +			dev_err(&pdev->dev, "Failed to set workmode on %s\n",
> +				config.descs[i].name);
>  	}
>  
>  	return 0;
> -- 
> 1.8.3.2
> 

It looks like you're modifying code you just introduced. You should
probably move this patch earlier on, so that you don't have to patch
your patch.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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