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@@ -270,7 +270,8 @@ int blk_next_device(struct udevice **devp);
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* @drv_name: Driver name to use for the block device
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* @name: Name for the device
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* @if_type: Interface type (enum if_type_t)
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- * @devnum: Device number, specific to the interface type
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+ * @devnum: Device number, specific to the interface type, or -1 to
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+ * allocate the next available number
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* @blksz: Block size of the device in bytes (typically 512)
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* @size: Total size of the device in bytes
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* @devp: the new device (which has not been probed)
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@@ -299,6 +300,18 @@ int blk_prepare_device(struct udevice *dev);
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*/
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int blk_unbind_all(int if_type);
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+/**
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+ * blk_find_max_devnum() - find the maximum device number for an interface type
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+ *
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+ * Finds the last allocated device number for an interface type @if_type. The
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+ * next number is safe to use for a newly allocated device.
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+ *
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+ * @if_type: Interface type to scan
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+ * @return maximum device number found, or -ENODEV if none, or other -ve on
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+ * error
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+ */
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+int blk_find_max_devnum(enum if_type if_type);
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+
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#else
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#include <errno.h>
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/*
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