mmc: Allow setting slot index via devicetree alias

As with gpio, uart and others, allow specifying the name_idx via the
aliases-node in the devicetree.

On embedded devices, there is often a combination of removable (e.g.
SD card) and non-removable mmc devices (e.g. eMMC).
Therefore the name_idx might change depending on
- host of removable device
- removable card present or not

This makes it difficult to hard code the root device, if it is on the
non-removable device. E.g. if SD card is present eMMC will be mmcblk1,
if SD card is not present at boot, eMMC will be mmcblk0.

If the aliases-node is not found, the driver will act as before.

The original patch is from here:
https://www.mail-archive.com/linux-mmc@vger.kernel.org/msg26472.html

The patch requires additional alias_id fix or it won't work.
Because according to function definition the max_idx parameter of idx_alloc
is exclusive, so need add 1 or it will be unable to find the proper idx
within an invalid range.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Dong Aisheng <b29396@freescale.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 39613b9a6fc5..c3d6e7073e1d 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -192,6 +192,9 @@ extern int mmc_flush_cache(struct mmc_card *);
 
 extern int mmc_detect_card_removed(struct mmc_host *host);
 
+int mmc_first_nonreserved_index(void);
+int mmc_get_reserved_index(struct mmc_host *host);
+
 /**
  *      mmc_claim_host - exclusively claim a host
  *      @host: mmc host to claim