[PATCH v2 1/3] dtoc: look for compatible string aliases in driver list

[Walter Lozano]

Currently dtoc checks if the first compatible string in a dtb node
matches either a driver o driver alias name, without taking into account
any other compatible string in the list. In the case that no driver matches
the first compatible string a warning is printed and the U_BOOT_DEVICE is
not being declared correctly.

This patch adds dtoc's support for try all the compatible strings in the
dtb node, in an effort to find the correct driver.

Signed-off-by: Walter Lozano <walter.lozano at collabora.com>
---

(no changes since v1)

 tools/dtoc/dtb_platdata.py       | 45 ++++++++++++++++----------------
 tools/dtoc/dtoc_test_aliases.dts |  5 ++++
 tools/dtoc/test_dtoc.py          | 20 +++++++++++---
 3 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index c148c49625..b1b082e508 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -111,21 +111,17 @@ def get_value(ftype, value):
         return '%#x' % value
 
 def get_compat_name(node):
-    """Get a node's first compatible string as a C identifier
+    """Get the node's list of compatible string as a C identifiers
 
     Args:
         node: Node object to check
     Return:
-        Tuple:
-            C identifier for the first compatible string
-            List of C identifiers for all the other compatible strings
-                (possibly empty)
+        List of C identifiers for all the compatible strings
     """
     compat = node.props['compatible'].value
-    aliases = []
-    if isinstance(compat, list):
-        compat, aliases = compat[0], compat[1:]
-    return conv_name_to_c(compat), [conv_name_to_c(a) for a in aliases]
+    if not isinstance(compat, list):
+        compat = [compat]
+    return [conv_name_to_c(c) for c in compat]
 
 
 class DtbPlatdata(object):
@@ -169,7 +165,7 @@ class DtbPlatdata(object):
     def get_normalized_compat_name(self, node):
         """Get a node's normalized compat name
 
-        Returns a valid driver name by retrieving node's first compatible
+        Returns a valid driver name by retrieving node's list of compatible
         string as a C identifier and performing a check against _drivers
         and a lookup in driver_aliases printing a warning in case of failure.
 
@@ -183,19 +179,24 @@ class DtbPlatdata(object):
                 In case of no match found, the return will be the same as
                 get_compat_name()
         """
-        compat_c, aliases_c = get_compat_name(node)
-        if compat_c not in self._drivers:
-            compat_c_old = compat_c
-            compat_c = self._driver_aliases.get(compat_c)
-            if not compat_c:
-                if not self._warning_disabled:
-                    print('WARNING: the driver %s was not found in the driver list'
-                          % (compat_c_old))
-                compat_c = compat_c_old
-            else:
-                aliases_c = [compat_c_old] + aliases_c
+        compat_list_c = get_compat_name(node)
+
+        for compat_c in compat_list_c:
+            if not compat_c in self._drivers:
+                compat_c = self._driver_aliases.get(compat_c)
+                if not compat_c:
+                    continue
+
+            aliases_c = compat_list_c
+            if compat_c in aliases_c:
+                aliases_c.remove(compat_c)
+            return compat_c, aliases_c
+
+        if not self._warning_disabled:
+            print('WARNING: the driver %s was not found in the driver list'
+                  % (compat_list_c[0]))
 
-        return compat_c, aliases_c
+        return compat_list_c[0], compat_list_c[1:]
 
     def setup_output(self, fname):
         """Set up the output destination
diff --git a/tools/dtoc/dtoc_test_aliases.dts b/tools/dtoc/dtoc_test_aliases.dts
index e545816f4e..ae33716863 100644
--- a/tools/dtoc/dtoc_test_aliases.dts
+++ b/tools/dtoc/dtoc_test_aliases.dts
@@ -14,4 +14,9 @@
 		intval = <1>;
 	};
 
+	spl-test2 {
+		u-boot,dm-pre-reloc;
+		compatible = "compat1", "simple_bus";
+		intval = <1>;
+	};
 };
diff --git a/tools/dtoc/test_dtoc.py b/tools/dtoc/test_dtoc.py
index 3c8e343b1f..edb3912e94 100755
--- a/tools/dtoc/test_dtoc.py
+++ b/tools/dtoc/test_dtoc.py
@@ -144,18 +144,18 @@ class TestDtoc(unittest.TestCase):
 
         prop = Prop(['rockchip,rk3399-sdhci-5.1', 'arasan,sdhci-5.1'])
         node = Node({'compatible': prop})
-        self.assertEqual(('rockchip_rk3399_sdhci_5_1', ['arasan_sdhci_5_1']),
+        self.assertEqual((['rockchip_rk3399_sdhci_5_1', 'arasan_sdhci_5_1']),
                          get_compat_name(node))
 
         prop = Prop(['rockchip,rk3399-sdhci-5.1'])
         node = Node({'compatible': prop})
-        self.assertEqual(('rockchip_rk3399_sdhci_5_1', []),
+        self.assertEqual((['rockchip_rk3399_sdhci_5_1']),
                          get_compat_name(node))
 
         prop = Prop(['rockchip,rk3399-sdhci-5.1', 'arasan,sdhci-5.1', 'third'])
         node = Node({'compatible': prop})
-        self.assertEqual(('rockchip_rk3399_sdhci_5_1',
-                          ['arasan_sdhci_5_1', 'third']),
+        self.assertEqual((['rockchip_rk3399_sdhci_5_1',
+                          'arasan_sdhci_5_1', 'third']),
                          get_compat_name(node))
 
     def test_empty_file(self):
@@ -566,6 +566,9 @@ void dm_populate_phandle_data(void) {
 struct dtd_compat1 {
 \tfdt32_t\t\tintval;
 };
+struct dtd_simple_bus {
+\tfdt32_t\t\tintval;
+};
 #define dtd_compat2_1_fred dtd_compat1
 #define dtd_compat3 dtd_compat1
 ''', data)
@@ -583,6 +586,15 @@ U_BOOT_DEVICE(spl_test) = {
 \t.platdata_size\t= sizeof(dtv_spl_test),
 };
 
+static struct dtd_simple_bus dtv_spl_test2 = {
+\t.intval\t\t\t= 0x1,
+};
+U_BOOT_DEVICE(spl_test2) = {
+\t.name\t\t= "simple_bus",
+\t.platdata\t= &dtv_spl_test2,
+\t.platdata_size\t= sizeof(dtv_spl_test2),
+};
+
 ''' + C_EMPTY_POPULATE_PHANDLE_DATA, data)
 
     def test_addresses64(self):
-- 
2.20.1