[U-Boot] [PATCH v2] mmc: mmc-uclass: use the fixed devnum with alias node

[Jaehoon Chung]

On 02/02/2017 01:41 PM, Jaehoon Chung wrote:
> If there are alias nodes as "mmc", use the devnum as alias index
> number.
> This patch is for fixing a problem of Exynos4 series.
> Problem is the below thing.
> 
> Current legacy mode:
> EXYNOS DWMMC: 0, SAMSUNG SDHCI: 1
> 
> After using DM:
> SAMSUNG SDHCI: 0, EXYNOS DWMMC: 1
> 
> Dev index is swapped.
> Then u-boot can't find the kernel image..because it is already set to 0 as mmcdev.
> If change from legacy to DM, also needs to touch all exynos4 config file.
> For using simply, just supporting the fixed devnum with alias node is better than it.
> 
> Usage:
> alaise {
> 	....
> 	mmc0 = &sdhci2; /* eMMC */
> 	mmc1 = &sdhci1; /* SD */
> 	...
> }
> 
> Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied on u-boot-mmc.

Best Regards,
Jaehoon Chung

> ---
> Changelog on V2:
> - Add the #ifndef CONFIG_SPL_BUILD
> - Fixes the typo by Simon's comment
> 
>  drivers/mmc/mmc-uclass.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
> index 2fe5d61..de7acb6 100644
> --- a/drivers/mmc/mmc-uclass.c
> +++ b/drivers/mmc/mmc-uclass.c
> @@ -13,6 +13,8 @@
>  #include <dm/root.h>
>  #include "mmc_private.h"
>  
> +DECLARE_GLOBAL_DATA_PTR;
> +
>  #ifdef CONFIG_DM_MMC_OPS
>  int dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
>  		    struct mmc_data *data)
> @@ -192,10 +194,15 @@ int mmc_bind(struct udevice *dev, struct mmc *mmc, const struct mmc_config *cfg)
>  {
>  	struct blk_desc *bdesc;
>  	struct udevice *bdev;
> -	int ret;
> +	int ret, devnum = -1;
> +
> +#ifndef CONFIG_SPL_BUILD
> +	/* Use the fixed index with aliase node's index */
> +	fdtdec_get_alias_seq(gd->fdt_blob, "mmc", dev->of_offset, &devnum);
> +#endif
>  
> -	ret = blk_create_devicef(dev, "mmc_blk", "blk", IF_TYPE_MMC, -1, 512,
> -				 0, &bdev);
> +	ret = blk_create_devicef(dev, "mmc_blk", "blk", IF_TYPE_MMC,
> +			devnum, 512, 0, &bdev);
>  	if (ret) {
>  		debug("Cannot create block device\n");
>  		return ret;
>