From: Tien Fong Chee <tien.fong.c...@intel.com>
Add a function to find the block device descriptor of the parent
device.
Signed-off-by: Tien Fong Chee <tien.fong.c...@intel.com>
---
drivers/block/blk-uclass.c | 23 +++++++++++++++++++++++
include/blk.h | 9 +++++++++
2 files changed, 32 insertions(+)
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
index 9e0c823..facf527 100644
--- a/drivers/block/blk-uclass.c
+++ b/drivers/block/blk-uclass.c
@@ -132,6 +132,29 @@ struct blk_desc *blk_get_devnum_by_typename(const char
*if_typename, int devnum)
}
/**
+ * blk_get_by_device() - Get the block device descriptor for the given device
+ * @dev: Instance of a storage device
+ *
+ * Return: With block device descriptor on success , NULL if there is no such
+ * block device.
+ */
+struct blk_desc *blk_get_by_device(struct udevice *dev)
+{
+ struct udevice *child_dev, *next;
+
+ device_foreach_child_safe(child_dev, next, dev) {
+ if (device_get_uclass_id(child_dev) != UCLASS_BLK)
+ continue;
+
+ return dev_get_uclass_platdata(child_dev);
+ }
+
+ debug("%s: No block device found\n", __func__);
+
+ return NULL;
+}
+
+/**
* get_desc() - Get the block device descriptor for the given device number
*
* @if_type: Interface type
diff --git a/include/blk.h b/include/blk.h
index 86f6d50..8ba9ab9 100644
--- a/include/blk.h
+++ b/include/blk.h
@@ -541,6 +541,15 @@ struct blk_desc *blk_get_devnum_by_typename(const char
*if_typename,
int devnum);
/**
+ * blk_get_by_device() - Get the block device descriptor for the given device
+ * @dev: Instance of a storage device
+ *
+ * Return: With block device descriptor on success , NULL if there is no such
+ * block device.
+ */
+struct blk_desc *blk_get_by_device(struct udevice *dev);
+
+/**
* blk_dselect_hwpart() - select a hardware partition
*
* This selects a hardware partition (such as is supported by MMC). The block
--
2.2.0
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