dtoc: extend dtoc to use struct driver_info when linking nodes

In the current implementation, when dtoc parses a dtb to generate a struct
platdata it converts the information related to linked nodes as pointers
to struct platdata of destination nodes. By doing this, it makes
difficult to get pointer to udevices created based on these
information.

This patch extends dtoc to use struct driver_info when populating
information about linked nodes, which makes it easier to later get
the devices created. In this context, reimplement functions like
clk_get_by_index_platdata() which made use of the previous approach.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 23 insertions, 3 deletions

diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index cac422a68d..c4d3265f05 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -151,6 +151,7 @@ class DtbPlatdata(object):
             key: Driver alias declared with
                 U_BOOT_DRIVER_ALIAS(driver_alias, driver_name)
             value: Driver name declared with U_BOOT_DRIVER(driver_name)
+        _links: List of links to be included in dm_populate_phandle_data()
     """
     def __init__(self, dtb_fname, include_disabled, warning_disabled):
         self._fdt = None
@@ -163,6 +164,7 @@ class DtbPlatdata(object):
         self._aliases = {}
         self._drivers = []
         self._driver_aliases = {}
+        self._links = []
 
     def get_normalized_compat_name(self, node):
         """Get a node's normalized compat name
@@ -556,7 +558,7 @@ class DtbPlatdata(object):
         """
         struct_name, _ = self.get_normalized_compat_name(node)
         var_name = conv_name_to_c(node.name)
-        self.buf('static const struct %s%s %s%s = {\n' %
+        self.buf('static struct %s%s %s%s = {\n' %
                  (STRUCT_PREFIX, struct_name, VAL_PREFIX, var_name))
         for pname in sorted(node.props):
             prop = node.props[pname]
@@ -575,6 +577,7 @@ class DtbPlatdata(object):
                 if info:
                     # Process the list as pairs of (phandle, id)
                     pos = 0
+                    item = 0
                     for args in info.args:
                         phandle_cell = prop.value[pos]
                         phandle = fdt_util.fdt32_to_cpu(phandle_cell)
@@ -584,8 +587,16 @@ class DtbPlatdata(object):
                         for i in range(args):
                             arg_values.append(str(fdt_util.fdt32_to_cpu(prop.value[pos + 1 + i])))
                         pos += 1 + args
-                        vals.append('\t{&%s%s, {%s}}' % (VAL_PREFIX, name,
-                                                     ', '.join(arg_values)))
+                        # node member is filled with NULL as the real value
+                        # will be update at run-time during dm_init_and_scan()
+                        # by dm_populate_phandle_data()
+                        vals.append('\t{NULL, {%s}}' % (', '.join(arg_values)))
+                        var_node = '%s%s.%s[%d].node' % \
+                                    (VAL_PREFIX, var_name, member_name, item)
+                        # Save the the link information to be use to define
+                        # dm_populate_phandle_data()
+                        self._links.append({'var_node': var_node, 'dev_name': name})
+                        item += 1
                     for val in vals:
                         self.buf('\n\t\t%s,' % val)
                 else:
@@ -641,6 +652,15 @@ class DtbPlatdata(object):
             self.output_node(node)
             nodes_to_output.remove(node)
 
+        # Define dm_populate_phandle_data() which will add the linking between
+        # nodes using DM_GET_DEVICE
+        # dtv_dmc_at_xxx.clocks[0].node = DM_GET_DEVICE(clock_controller_at_xxx)
+        self.buf('void dm_populate_phandle_data(void) {\n')
+        for l in self._links:
+            self.buf('\t%s = DM_GET_DEVICE(%s);\n' % (l['var_node'], l['dev_name']))
+        self.buf('}\n')
+
+        self.out(''.join(self.get_buf()))
 
 def run_steps(args, dtb_file, include_disabled, output, warning_disabled=False):
     """Run all the steps of the dtoc tool