mmc-uclass: correct the device number

Not like the mmc-legacy which the devnum starts from 1, it starts from 0
in mmc-uclass, so the device number should be (devnum + 1) in get_mmc_num().
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>
Acked-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/mmc-uclass.c

@@ -111,18 +111,18 @@ struct mmc *find_mmc_device(int dev_num)
 
 int get_mmc_num(void)
 {
-	return max(blk_find_max_devnum(IF_TYPE_MMC), 0);
+	return max((blk_find_max_devnum(IF_TYPE_MMC) + 1), 0);
 }
 
 int mmc_get_next_devnum(void)
 {
 	int ret;
 
-	ret = get_mmc_num();
+	ret = blk_find_max_devnum(IF_TYPE_MMC);
 	if (ret < 0)
 		return ret;
 
-	return ret + 1;
+	return ret;
 }
 
 struct blk_desc *mmc_get_blk_desc(struct mmc *mmc)

include/mmc.h

@@ -503,6 +503,12 @@ void mmc_set_clock(struct mmc *mmc, uint clock);
 struct mmc *find_mmc_device(int dev_num);
 int mmc_set_dev(int dev_num);
 void print_mmc_devices(char separator);
+
+/**
+ * get_mmc_num() - get the total MMC device number
+ *
+ * @return 0 if there is no MMC device, else the number of devices
+ */
 int get_mmc_num(void);
 int mmc_hwpart_config(struct mmc *mmc, const struct mmc_hwpart_conf *conf,
 		      enum mmc_hwpart_conf_mode mode);