linux-kernel - Re: [PATCH v2 5/5] regulator: map consumer regulator based on device tree

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Date:	Mon, 10 Oct 2011 18:35:07 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Rajendra Nayak <rnayak@...com>
Cc:	grant.likely@...retlab.ca, devicetree-discuss@...ts.ozlabs.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, lrg@...com, b-cousson@...com, patches@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] regulator: map consumer regulator based on device
 tree

On Mon, Oct 10, 2011 at 09:49:38PM +0530, Rajendra Nayak wrote:

> Device nodes in DT can associate themselves with one or more
> regulators/supply by providing a list of phandles (to regulator nodes)
> and corresponding supply names.

Mostly looks good.

> +/**
> + * of_get_regulator - get a regulator device node based on supply name
> + * @dev: Device pointer for the consumer (of regulator) device
> + * @supply: regulator supply name
> + *
> + * Extract the regulator device node corresponding to the supply name.
> + * retruns the device node corresponding to the regulator if found, else
> + * returns NULL.
> + */
> +struct device_node *of_get_regulator(struct device *dev, const char *supply)
> +{

Should be static.

> @@ -1178,6 +1225,10 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
>  			goto found;
>  		}
>  	}
> +	if (!dev)
> +		list_for_each_entry(rdev, &regulator_list, list)
> +			if (strcmp(rdev_get_name(rdev), id))
> +				goto found;
>  

This looks really strange, we didn't remove any old lookup code and the
DT lookup jumps to found by iself so why are we adding code here?

> +	if (supply) {
> +		struct regulator_dev *r;
> +		struct device_node *node;
> +
> +		/* first do a dt based lookup */
> +		if (dev) {
> +			node = of_get_regulator(dev, supply);
> +			if (node)
> +				list_for_each_entry(r, &regulator_list, list)
> +					if (node == r->dev.parent->of_node)
> +						goto found;
>  		}
>  
> -		if (!found) {
> -			dev_err(dev, "Failed to find supply %s\n",
> -				init_data->supply_regulator);
> -			ret = -ENODEV;
> -			goto scrub;
> -		}
> +		/* next try doing it non-dt way */
> +		list_for_each_entry(r, &regulator_list, list)
> +			if (strcmp(rdev_get_name(r), supply) == 0)
> +				goto found;
>  
> +		dev_err(dev, "Failed to find supply %s\n", supply);
> +		ret = -ENODEV;
> +		goto scrub;
> +
> +found:

This is all getting *really* complicated and illegible.  I'm not sure
what the best way to structure is but erroring out early looks useful.
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