1 files changed, 17 insertions, 1 deletions
diff --git a/include/spl.h b/include/spl.h
index 5d8d14dbf5..fffcc610bb 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -238,7 +238,23 @@ int spl_load_imx_container(struct spl_image_info *spl_image,
 /* SPL common functions */
 void preloader_console_init(void);
 u32 spl_boot_device(void);
-u32 spl_boot_mode(const u32 boot_device);
+
+/**
+ * spl_mmc_boot_mode() - Lookup function for the mode of an MMC boot source.
+ * @boot_device:	ID of the device which the MMC driver wants to read
+ *			from.  Common values are e.g. BOOT_DEVICE_MMC1,
+ *			BOOT_DEVICE_MMC2, BOOT_DEVICE_MMC2_2.
+ *
+ * This function should return one of MMCSD_MODE_FS, MMCSD_MODE_EMMCBOOT, or
+ * MMCSD_MODE_RAW for each MMC boot source which is defined for the target.  The
+ * boot_device parameter tells which device the MMC driver is interested in.
+ *
+ * If not overridden, it is weakly defined in common/spl/spl_mmc.c.
+ *
+ * Note:  It is important to use the boot_device parameter instead of e.g.
+ * spl_boot_device() as U-Boot is not always loaded from the same device as SPL.
+ */
+u32 spl_mmc_boot_mode(const u32 boot_device);
 int spl_boot_partition(const u32 boot_device);
 void spl_set_bd(void);