binman: Use standard filenames for SPL/TPL devicetree

At present, before any entry expansion is done (such as a 'files' entry
expanding out to individual entries for each file it contains), we check
the binman definition (i.e. '/binman' node) to find out what devicetree
files are used in the images.

This is a pain, since the definition may change during expansion. For
example if there is no u-boot-spl-dtb entry in the definition at the start,
we assume that the SPL devicetree is not used. But if an entry later
expands to include this, then we don't notice.

In fact the flexibility provided by the current approach of checking the
definition is not really useful. We know that we can have SPL and TPL
devicetrees. We know the pathname to each, so we can simply check if the
files are present. If they are present, we can prepare them and update
them regardless of whether they are actually used. If they are not present,
we cannot prepare/update them anyway, i.e. an error will be generated.

Simplify state.Prepare() so it uses a hard-coded list of devicetree files.

Note that state.PrepareFromLoadedData() is left untouched, since in that
case we have a complete definition from the loaded file, but cannot of
course rely on the devicetree files that created it still being present.
So in that case we still check the image defitions.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/state.py

@@ -188,17 +188,16 @@ def Prepare(images, dtb):
             output_fdt_info[etype] = [dtb, fname]
     else:
         fdt_set = {}
-        for image in images.values():
-            fdt_set.update(image.GetFdts())
-        for etype, other in fdt_set.items():
-            entry, fname = other
-            infile = tools.GetInputFilename(fname)
-            fname_dtb = fdt_util.EnsureCompiled(infile)
-            out_fname = tools.GetOutputFilename('%s.out' %
-                    os.path.split(fname)[1])
-            tools.WriteFile(out_fname, tools.ReadFile(fname_dtb))
-            other_dtb = fdt.FdtScan(out_fname)
-            output_fdt_info[etype] = [other_dtb, out_fname]
+        for etype, fname in DTB_TYPE_FNAME.items():
+            infile = tools.GetInputFilename(fname, allow_missing=True)
+            if infile and os.path.exists(infile):
+                fname_dtb = fdt_util.EnsureCompiled(infile)
+                out_fname = tools.GetOutputFilename('%s.out' %
+                        os.path.split(fname)[1])
+                tools.WriteFile(out_fname, tools.ReadFile(fname_dtb))
+                other_dtb = fdt.FdtScan(out_fname)
+                output_fdt_info[etype] = [other_dtb, out_fname]
+
 
 def PrepareFromLoadedData(image):
     """Get device tree files ready for use with a loaded image

tools/patman/tools.py

@@ -130,8 +130,12 @@ def GetInputFilename(fname, allow_missing=False):
         allow_missing: True if the filename can be missing
 
     Returns:
-        The full path of the filename, within the input directory, or
-        None on error
+        fname, if indir is None;
+        full path of the filename, within the input directory;
+        None, if file is missing and allow_missing is True
+
+    Raises:
+        ValueError if file is missing and allow_missing is False
     """
     if not indir or fname[:1] == '/':
         return fname