[PATCH 6.2/7] MMC: mmci: Enable Device Tree support for ux500

[lee.jones@linaro.org (Lee Jones)]

On 03/05/12 16:12, Russell King - ARM Linux wrote:
> On Thu, May 03, 2012 at 04:03:34PM +0100, Lee Jones wrote:
>> +#ifdef CONFIG_OF
>> +static void mmci_dt_populate_generic_pdata(struct device_node *np,
>> +					struct mmci_platform_data *pdata)
>> +{
>> +	int bus_width = 0;
>> +
>> +	of_property_read_u32(np, "wp-gpios",&pdata->gpio_wp);
>> +	if (!pdata->gpio_wp)
>> +		pdata->gpio_wp = -1;
>> +
>> +	of_property_read_u32(np, "cd-gpios",&pdata->gpio_cd);
>> +	if (!pdata->gpio_cd)
>> +		pdata->gpio_cd = -1;
>> +
>> +	if (of_get_property(np, "cd-inverted", NULL))
>> +		pdata->cd_invert = true;
>> +	else
>> +		pdata->cd_invert = false;
>> +
>> +	of_property_read_u32(np, "max-frequency",&pdata->f_max);
>> +	if (!pdata->f_max)
>> +		pr_warn("%s has no 'max-frequency' property\n", np->full_name);
>> +
>> +	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
>> +		pdata->capabilities |= MMC_CAP_MMC_HIGHSPEED;
>> +	if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
>> +		pdata->capabilities |= MMC_CAP_SD_HIGHSPEED;
>> +
>> +	of_property_read_u32(np, "bus-width",&bus_width);
>> +	switch (bus_width) {
>> +	case 0 :
>> +		/* No bus-width supplied. */
>> +		break;
>> +	case 4 :
>> +		pdata->capabilities |= MMC_CAP_4_BIT_DATA;
>> +		break;
>> +	case 8 :
>> +		pdata->capabilities |= MMC_CAP_8_BIT_DATA;
>> +		break;
>> +	default :
>> +		pr_warn("%s: Unsupported bus width\n", np->full_name);
>> +	}
>> +}
>> +#endif
>> +
>>   static int __devinit mmci_probe(struct amba_device *dev,
>>   	const struct amba_id *id)
>>   {
>>   	struct mmci_platform_data *plat = dev->dev.platform_data;
>> +	struct device_node *np = dev->dev.of_node;
>>   	struct variant_data *variant = id->data;
>>   	struct mmci_host *host;
>>   	struct mmc_host *mmc;
>> -	int ret;
>> +	int ret, freeplat = 0;
>> +
>> +	/* Must have platform data or Device Tree. */
>> +	if (!plat&&  !np) {
>> +		dev_err(&dev->dev, "No plat data or DT found\n");
>> +		return -EINVAL;
>> +	}
>>
>> -	/* must have platform data */
>>   	if (!plat) {
>> -		ret = -EINVAL;
>> -		goto out;
>> +		plat = kzalloc(sizeof(*plat), GFP_KERNEL);
>
> I think this will leak memory - consider what happens if the driver gets
> bound and unbound from the same device a number of times.
>
> How about using devm_kzalloc() instead, so that when probe fails or the
> driver is unbound, the memory is automatically freed?  No need for that
> freeplat variable either...

Makes sense. Give me a few moments.

>> +		if (!plat)
>> +			return -ENOMEM;
>> +		freeplat = 1;
>>   	}
>>
>> +	if (np)
>> +		mmci_dt_populate_generic_pdata(np, plat);
>> +
>>   	ret = amba_request_regions(dev, DRIVER_NAME);
>>   	if (ret)
>>   		goto out;
>> @@ -1448,6 +1505,9 @@ static int __devinit mmci_probe(struct amba_device *dev,
>>    rel_regions:
>>   	amba_release_regions(dev);
>>    out:
>> +	if (freeplat)
>> +		kfree(plat);
>> +
>>   	return ret;
>>   }
>>
>> --
>> 1.7.9.5


-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
M: +44 77 88 633 515
Linaro.org ? Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog