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

[Russell King - ARM Linux]

So why is this buggy patch now merged in the mainline kernel?

On Mon, Apr 16, 2012 at 10:26:08AM +0100, Lee Jones wrote:
> From: Lee Jones <lee.jones at linaro.org>
> Date: Mon, 16 Apr 2012 10:18:43 +0100
> Subject: [PATCH 6.2/7] MMC: mmci: Enable Device Tree support for ux500 variants
> 
> Provide a means to collect attributes specific to ST-Ericsson's
> ux500 variant series. This patch registers itself as the AMBA
> driver to be called during the probe process. Once all
> attributes and ux500 specifics are are collected the normal
> mmci core probe is called.
> 
> Acked-by: Linus Walleij <linus.walleij at linaro.org>
> Acked-by: Arnd Bergmann <arnd at arndb.de>
> Signed-off-by: Lee Jones <lee.jones at linaro.org>
> ---
>  drivers/mmc/host/mmci.c |   58 +++++++++++++++++++++++++++++++++++++++++++---
>  1 files changed, 54 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
> index 032b847..5a7da17 100644
> --- a/drivers/mmc/host/mmci.c
> +++ b/drivers/mmc/host/mmci.c
> @@ -15,6 +15,7 @@
>  #include <linux/device.h>
>  #include <linux/interrupt.h>
>  #include <linux/kernel.h>
> +#include <linux/slab.h>
>  #include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/highmem.h>
> @@ -1196,21 +1197,70 @@ static const struct mmc_host_ops mmci_ops = {
>  	.get_cd		= mmci_get_cd,
>  };
>  
> +#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;
>  
> -	/* must have platform data */
> -	if (!plat) {
> -		ret = -EINVAL;
> -		goto out;
> +	/* Must have platform data or Device Tree. */
> +	if (!plat && !np) {
> +		dev_err(&dev->dev, "No plat data or DT found\n");
> +		return -EINVAL;
>  	}
>  
> +	if (np)
> +		mmci_dt_populate_generic_pdata(np, plat);
> +
>  	ret = amba_request_regions(dev, DRIVER_NAME);
>  	if (ret)
>  		goto out;
> -- 
> 1.7.9.1
>