[U-Boot] [PATCH v3] mmc-uclass: correct the device number

[Kever Yang]

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: Kever Yang <kever.yang at rock-chips.com>
---

Changes in v3:
- apply comments from Jaehoon Chung

Changes in v2:
- add comment for get_mmc_num() in mmc.h
- update mmc_get_next_devnum()

 drivers/mmc/mmc-uclass.c | 4 ++--
 include/mmc.h            | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 38ced41..d0ca91b 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -111,7 +111,7 @@ 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)
@@ -122,7 +122,7 @@ int mmc_get_next_devnum(void)
 	if (ret < 0)
 		return ret;
 
-	return ret + 1;
+	return ret;
 }
 
 struct blk_desc *mmc_get_blk_desc(struct mmc *mmc)
diff --git a/include/mmc.h b/include/mmc.h
index 8f309f1..dd47f34 100644
--- a/include/mmc.h
+++ b/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);
-- 
1.9.1