[PATCH v6 1/2] part: Export part_driver_lookup_type for external use

[Javier Tia]

Make part_driver_lookup_type non-static so it can be used outside
part.c. This allows external callers to determine the appropriate
partition driver for a block device, enabling more flexible handling of
partition types.

Add a prototype and kernel-doc comment in part.h to document the
function contract. Provide a stub inline implementation returning NULL
when partition support is disabled, ensuring build consistency across
configurations.

Signed-off-by: Javier Tia <javier.tia at linaro.org>
---
 disk/part.c    |  2 +-
 include/part.h | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/disk/part.c b/disk/part.c
index 66e2b3a7219..f0c6866e210 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -63,7 +63,7 @@ static struct part_driver *part_driver_get_type(int part_type)
  * @dev_desc: Device descriptor
  * Return: Driver found, or NULL if none
  */
-static struct part_driver *part_driver_lookup_type(struct blk_desc *desc)
+struct part_driver *part_driver_lookup_type(struct blk_desc *desc)
 {
 	struct part_driver *drv =
 		ll_entry_start(struct part_driver, part_driver);
diff --git a/include/part.h b/include/part.h
index b772fb34c8a..52fd3d534e0 100644
--- a/include/part.h
+++ b/include/part.h
@@ -471,6 +471,9 @@ ulong disk_blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
 #define part_get_info_ptr(x)	x
 #endif
 
+static inline struct part_driver *part_driver_lookup_type(struct blk_desc *desc)
+{ return NULL; }
+
 /**
  * struct part_driver - partition driver
  */
@@ -727,6 +730,24 @@ int part_get_type_by_name(const char *name);
  */
 int part_get_bootable(struct blk_desc *desc);
 
+/**
+ * part_driver_lookup_type() - Look up the partition driver for a blk device
+ *
+ * If @desc->part_type is PART_TYPE_UNKNOWN, this checks each partition driver
+ * against the blk device to see if there is a valid partition table acceptable
+ * to that driver.
+ *
+ * If @desc->part_type is already set, it just returns the driver for that
+ * type, without testing if the driver can find a valid partition on the
+ * descriptor.
+ *
+ * On success it updates @desc->part_type if set to PART_TYPE_UNKNOWN on entry
+ *
+ * @desc: Device descriptor
+ * Return: Driver found, or NULL if none
+ */
+struct part_driver *part_driver_lookup_type(struct blk_desc *desc);
+
 #else
 static inline int part_driver_get_count(void)
 { return 0; }
-- 
2.51.0