[PATCH 3/8] dtoc: Allow multiple warnings for a driver

[Simon Glass]

At present we show when a driver is missing but this is not always that
useful. There are various reasons way a driver may appear to be missing,
such as a parse error in the source code or a missing field in the driver
declaration.

Update the implementation to record all warnings for each driver, showing
only those which relate to drivers that are actually used. This avoids
spamming the user with warnings related to a driver for a different board.

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

 tools/dtoc/src_scan.py | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/tools/dtoc/src_scan.py b/tools/dtoc/src_scan.py
index 1dbb56712a3..6c37a71e978 100644
--- a/tools/dtoc/src_scan.py
+++ b/tools/dtoc/src_scan.py
@@ -13,6 +13,7 @@ U_BOOT_DRIVER(), UCLASS_DRIVER and all struct declarations in header files.
 See doc/driver-model/of-plat.rst for more informaiton
 """
 
+import collections
 import os
 import re
 import sys
@@ -190,6 +191,9 @@ class Scanner:
             value: Driver name declared with U_BOOT_DRIVER(driver_name)
         _drivers_additional (list or str): List of additional drivers to use
             during scanning
+        _warnings: Dict of warnings found:
+            key: Driver name
+            value: Set of warnings
         _of_match: Dict holding information about compatible strings
             key: Name of struct udevice_id variable
             value: Dict of compatible info in that variable:
@@ -217,6 +221,7 @@ class Scanner:
         self._driver_aliases = {}
         self._drivers_additional = drivers_additional or []
         self._missing_drivers = set()
+        self._warnings = collections.defaultdict(set)
         self._of_match = {}
         self._compat_to_driver = {}
         self._uclass = {}
@@ -267,7 +272,10 @@ class Scanner:
                 aliases_c.remove(compat_c)
             return compat_c, aliases_c
 
-        self._missing_drivers.add(compat_list_c[0])
+        name = compat_list_c[0]
+        self._missing_drivers.add(name)
+        self._warnings[name].add(
+            'WARNING: the driver %s was not found in the driver list' % name)
 
         return compat_list_c[0], compat_list_c[1:]
 
@@ -577,9 +585,17 @@ class Scanner:
 
     def show_warnings(self):
         """Show any warnings that have been collected"""
-        for name in sorted(list(self._missing_drivers)):
-            print('WARNING: the driver %s was not found in the driver list'
-                  % name)
+        used_drivers = [drv.name for drv in self._drivers.values() if drv.used]
+        missing = self._missing_drivers
+        for name in sorted(self._warnings.keys()):
+            if name in missing or name in used_drivers:
+                warns = sorted(list(self._warnings[name]))
+                # For now there is only ever one warning
+                print('%s: %s' % (name, warns[0]))
+                indent = ' ' * len(name)
+                if name in missing:
+                    missing.remove(name)
+                print()
 
     def scan_driver(self, fname):
         """Scan a driver file to build a list of driver names and aliases
-- 
2.32.0.93.g670b81a890-goog