[PATCH v2 04/14] spl: ufs: add SPL_UFS_FS Kconfig and filesystem boot stub

[Balaji Selvanathan]

Add a new SPL_UFS_FS Kconfig option to enable filesystem-based boot
from UFS (FAT or EXT4). When selected, a UFS_MODE_FS case is added
to the boot-mode switch in spl_ufs_load() raw mode on failure.

The filesystem path is currently a stub that
returns -ENOSYS, serving as a placeholder for future implementation.

Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
---
Changes in v2:
- Added the filesystem support in SPL UFS as a seperate patch
---
---
 common/spl/Kconfig   | 10 ++++++++++
 common/spl/spl_ufs.c |  9 +++++++++
 2 files changed, 19 insertions(+)

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 82b757d1efa..8609f08413b 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1682,6 +1682,16 @@ config SPL_UFS_RAW_U_BOOT_PARTITION_NUM
 	  with partition support. This is used if partition name is not
 	  specified or not found.
 
+config SPL_UFS_FS
+	bool "Enable UFS filesystem boot mode"
+	depends on SPL_UFS
+	help
+	  Enable filesystem-based boot from UFS. This allows loading
+	  U-Boot from FAT or EXT4 filesystems on UFS partitions.
+	  This is tried as a fallback if raw mode loading fails.
+
+	  Note: Filesystem support is not yet fully implemented.
+
 config SPL_WATCHDOG
 	bool "Support watchdog drivers"
 	imply SPL_WDT if !HW_WATCHDOG
diff --git a/common/spl/spl_ufs.c b/common/spl/spl_ufs.c
index 0590b796267..8a60948a304 100644
--- a/common/spl/spl_ufs.c
+++ b/common/spl/spl_ufs.c
@@ -142,6 +142,15 @@ int spl_ufs_load(struct spl_image_info *spl_image,
 			return 0;
 #endif
 		break;
+#ifdef CONFIG_SPL_UFS_FS
+	case UFS_MODE_FS:
+		debug("spl: ufs: boot mode: fs\n");
+
+		/* TODO: Implement filesystem support */
+		printf("spl: ufs: filesystem boot not implemented\n");
+		ret = -ENOSYS;
+		break;
+#endif
 	default:
 		puts("spl: ufs: wrong boot mode\n");
 	}

-- 
2.34.1