[PATCH 4/7] mfd: max8925: support dt for power supply

[Anton Vorontsov]

On Tue, Nov 06, 2012 at 03:42:44PM +0800, Qing Xu wrote:
> From: Qing Xu <qingx at marvell.com>
> 
> Signed-off-by: Qing Xu <qingx at marvell.com>
> ---

W/ this patch I'm getting this warning:

  CC      drivers/power/max8925_power.o
  drivers/power/max8925_power.c: In function ‘max8925_power_probe’:
  drivers/power/max8925_power.c:479:3: warning: statement with no effect
  [-Wunused-value]

>  drivers/power/max8925_power.c |   57 ++++++++++++++++++++++++++++++++++++----
>  1 files changed, 51 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
> index daa333b..dd2ac2d 100644
> --- a/drivers/power/max8925_power.c
> +++ b/drivers/power/max8925_power.c
> @@ -426,14 +426,58 @@ static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static int max8925_power_dt_init(struct platform_device *pdev,
> +			      struct max8925_power_pdata *pdata)
> +{
> +	struct device_node *nproot = pdev->dev.parent->of_node, *np;
> +	int batt_detect, topoff_threshold, fast_charge,
> +		no_temp_support, no_insert_detect;

One variable declaration per line please.

> +
> +	if (!nproot)
> +		return -ENODEV;

Please add an empty line here.

> +	np = of_find_node_by_name(nproot, "charger");
> +	if (!np) {
> +		dev_err(&pdev->dev, "failed to find charger node\n");
> +		return -ENODEV;
> +	}

ditto.

> +	of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
> +	of_property_read_u32(np, "batt-detect", &batt_detect);
> +	of_property_read_u32(np, "fast-charge", &fast_charge);
> +	of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
> +	of_property_read_u32(np, "no-temp-support", &no_temp_support);
> +
> +	pdata->batt_detect = batt_detect;
> +	pdata->fast_charge = fast_charge;
> +	pdata->topoff_threshold = topoff_threshold;
> +	pdata->no_insert_detect = no_insert_detect;
> +	pdata->no_temp_support = no_temp_support;

ditto

> +	pr_err("batt_detect%d, topoff_threshold%d, fast_charge%d,no_temp_support%d, no_insert_detect%d\n",
> +		batt_detect, topoff_threshold, fast_charge,
> +		no_temp_support, no_insert_detect);

pr_err, are you sure? :)

> +	return 0;
> +}
> +#else
> +#define max8925_power_dt_init(x, y)	(-1)

You should make it static inline function to get rid of the warning above.

> +#endif
> +
> +static char *power_supplicants[] = {
> +	"max8925-battery",
> +};
> +
>  static __devinit int max8925_power_probe(struct platform_device *pdev)
>  {
>  	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
> -	struct max8925_power_pdata *pdata = NULL;
> +	struct max8925_power_pdata *pdata = pdev->dev.platform_data;
>  	struct max8925_power_info *info;
>  	int ret;
>  
> -	pdata = pdev->dev.platform_data;
> +	if (pdev->dev.parent->of_node && !pdata) {
> +		pdata = devm_kzalloc(&pdev->dev,
> +				     sizeof(struct max8925_power_pdata),
> +				     GFP_KERNEL);
>

Please move this logic into max8925_power_dt_init().
So it will look like

	if (!pdata)
		pdata = max8925_power_dt_init(pdev);
	if (!pdata) {
		dev_err(...);
		return ...;
	}

> +		max8925_power_dt_init(pdev, pdata);
> +	}
>  	if (!pdata) {
>  		dev_err(&pdev->dev, "platform data isn't assigned to "
>  			"power supply\n");
> @@ -453,8 +497,8 @@ static __devinit int max8925_power_probe(struct platform_device *pdev)
>  	info->ac.properties = max8925_ac_props;
>  	info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
>  	info->ac.get_property = max8925_ac_get_prop;
> -	info->ac.supplied_to = pdata->supplied_to;
> -	info->ac.num_supplicants = pdata->num_supplicants;
> +	info->ac.supplied_to = power_supplicants;
> +	info->ac.num_supplicants = ARRAY_SIZE(power_supplicants);
>  	ret = power_supply_register(&pdev->dev, &info->ac);
>  	if (ret)
>  		goto out;
> @@ -465,8 +509,8 @@ static __devinit int max8925_power_probe(struct platform_device *pdev)
>  	info->usb.properties = max8925_usb_props;
>  	info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
>  	info->usb.get_property = max8925_usb_get_prop;
> -	info->usb.supplied_to = pdata->supplied_to;
> -	info->usb.num_supplicants = pdata->num_supplicants;
> +	info->usb.supplied_to = power_supplicants;
> +	info->usb.num_supplicants = ARRAY_SIZE(power_supplicants);
>  
>  	ret = power_supply_register(&pdev->dev, &info->usb);
>  	if (ret)
> @@ -491,6 +535,7 @@ static __devinit int max8925_power_probe(struct platform_device *pdev)
>  	info->no_insert_detect = pdata->no_insert_detect;
>  
>  	max8925_init_charger(chip, info);
> +

This change is unrelated.

>  	return 0;
>  out_battery:
>  	power_supply_unregister(&info->battery);
> -- 
> 1.7.0.4

Thanks,
Anton.