MdePkg/BaseFdtLib: Implement new libfdt wrappers

Add support for the define FdtForEachPropertyOffset and
FdtFindMaxPhandle() wrappers.

Signed-off-by: Antaeus Kleinert-Strand <[email protected]>

Author: antklein

MdePkg/Include/Library/FdtLib.h

@@ -202,6 +202,11 @@ typedef struct {
 #define FdtSetPropEmpty(Fdt, NodeOffset, Name) \
   FdtSetProp ((Fdt), (NodeOffset), (Name), NULL, 0)
 
+#define FdtForEachPropertyOffset(Property, Fdt, Node)   \
+  for (Property = FdtFirstPropertyOffset(Fdt, Node);    \
+       Property >= 0;                                   \
+       Property = FdtNextPropertyOffset(Fdt, Property))
+
 /**
   Convert UINT16 data of the FDT blob to little-endian
 
@@ -971,6 +976,22 @@ FdtGetPhandle (
   IN INT32       NodeOffset
   );
 
+/**
+  Find and return the highest phandle in a tree. The value returned in Phandle
+  is only valid if the function returns success.
+
+  @param[in]  Fdt            The pointer to FDT blob.
+  @param[out] Phandle        The return location for the highest Phandle value found in the tree
+
+  @return 0 on success or a negative error code on failure
+**/
+INT32
+EFIAPI
+FdtFindMaxPhandle (
+  IN CONST VOID  *Fdt,
+  OUT UINT32     *Phandle
+  );
+
 /**
   Applies a DT overlay on a base DT.
 

MdePkg/Library/BaseFdtLib/FdtLib.c

@@ -918,6 +918,25 @@ FdtGetPhandle (
   return fdt_get_phandle (Fdt, NodeOffset);
 }
 
+/**
+  Find and return the highest phandle in a tree. The value returned in Phandle
+  is only valid if the function returns success.
+
+  @param[in]  Fdt            The pointer to FDT blob.
+  @param[out] Phandle        The return location for the highest Phandle value found in the tree
+
+  @return 0 on success or a negative error code on failure
+**/
+INT32
+EFIAPI
+FdtFindMaxPhandle (
+  IN CONST VOID  *Fdt,
+  OUT UINT32     *Phandle
+  )
+{
+  return fdt_find_max_phandle (Fdt, Phandle);
+}
+
 /**
   Applies a DT overlay on a base DT.