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authorSimon Glass <sjg@chromium.org>2017-08-29 14:15:55 -0600
committerSimon Glass <sjg@chromium.org>2017-09-15 05:27:47 -0600
commit8fed2eb20c2ef95d69f9683ab07f0ea869616713 (patch)
treeb5cd984fcbe4026ec75e6e03fb613bcbf8b1ff8a /tools/dtoc
parent2925c26bb2b5450349c2080cac764c18e15a052e (diff)
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dtoc: Rename is_phandle() and adjust it to return more detail
Update this function to return more detail about a property that contains phandles. This will allow (in a future commit) more accurate handling of these properties. Signed-off-by: Simon Glass <sjg@chromium.org> Tested-by: Kever Yang <kever.yang@rock-chips.com>
Diffstat (limited to 'tools/dtoc')
-rw-r--r--tools/dtoc/dtb_platdata.py79
-rw-r--r--tools/dtoc/dtoc_test_phandle.dts1
2 files changed, 58 insertions, 22 deletions
diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index a483d6c..001bc4e 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -12,6 +12,7 @@ This supports converting device tree data to C structures definitions and
static data.
"""
+import collections
import copy
import sys
@@ -44,6 +45,14 @@ TYPE_NAMES = {
STRUCT_PREFIX = 'dtd_'
VAL_PREFIX = 'dtv_'
+# This holds information about a property which includes phandles.
+#
+# max_args: integer: Maximum number or arguments that any phandle uses (int).
+# args: Number of args for each phandle in the property. The total number of
+# phandles is len(args). This is a list of integers.
+PhandleInfo = collections.namedtuple('PhandleInfo', ['max_args', 'args'])
+
+
def conv_name_to_c(name):
"""Convert a device-tree name to a C identifier
@@ -181,20 +190,42 @@ class DtbPlatdata(object):
self._lines = []
return lines
- def is_phandle(self, prop):
- """Check if a node contains phandles
+ def get_phandle_argc(self, prop, node_name):
+ """Check if a node contains phandles
- We have no reliable way of detecting whether a node uses a phandle
- or not. As an interim measure, use a list of known property names.
+ We have no reliable way of detecting whether a node uses a phandle
+ or not. As an interim measure, use a list of known property names.
- Args:
- prop: Prop object to check
- Return:
- True if the object value contains phandles, else False
- """
- if prop.name in ['clocks']:
- return True
- return False
+ Args:
+ prop: Prop object to check
+ Return:
+ Number of argument cells is this is a phandle, else None
+ """
+ if prop.name in ['clocks']:
+ val = prop.value
+ if not isinstance(val, list):
+ val = [val]
+ i = 0
+
+ max_args = 0
+ args = []
+ while i < len(val):
+ phandle = fdt_util.fdt32_to_cpu(val[i])
+ target = self._fdt.phandle_to_node.get(phandle)
+ if not target:
+ raise ValueError("Cannot parse '%s' in node '%s'" %
+ (prop.name, node_name))
+ prop_name = '#clock-cells'
+ cells = target.props.get(prop_name)
+ if not cells:
+ raise ValueError("Node '%s' has no '%s' property" %
+ (target.name, prop_name))
+ num_args = fdt_util.fdt32_to_cpu(cells.value)
+ max_args = max(max_args, num_args)
+ args.append(num_args)
+ i += 1 + num_args
+ return PhandleInfo(max_args, args)
+ return None
def scan_dtb(self):
"""Scan the device tree to obtain a tree of nodes and properties
@@ -358,14 +389,16 @@ class DtbPlatdata(object):
for pname, prop in node.props.items():
if pname in PROP_IGNORE_LIST or pname[0] == '#':
continue
- if isinstance(prop.value, list):
- if self.is_phandle(prop):
- # Process the list as pairs of (phandle, id)
- value_it = iter(prop.value)
- for phandle_cell, _ in zip(value_it, value_it):
- phandle = fdt_util.fdt32_to_cpu(phandle_cell)
- target_node = self._fdt.phandle_to_node[phandle]
- node.phandles.add(target_node)
+ info = self.get_phandle_argc(prop, node.name)
+ if info:
+ if not isinstance(prop.value, list):
+ prop.value = [prop.value]
+ # Process the list as pairs of (phandle, id)
+ value_it = iter(prop.value)
+ for phandle_cell, _ in zip(value_it, value_it):
+ phandle = fdt_util.fdt32_to_cpu(phandle_cell)
+ target_node = self._fdt.phandle_to_node[phandle]
+ node.phandles.add(target_node)
def generate_structs(self, structs):
@@ -383,7 +416,8 @@ class DtbPlatdata(object):
self.out('struct %s%s {\n' % (STRUCT_PREFIX, name))
for pname in sorted(structs[name]):
prop = structs[name][pname]
- if self.is_phandle(prop):
+ info = self.get_phandle_argc(prop, structs[name])
+ if info:
# For phandles, include a reference to the target
self.out('\t%s%s[%d]' % (tab_to(2, 'struct phandle_2_cell'),
conv_name_to_c(prop.name),
@@ -423,7 +457,8 @@ class DtbPlatdata(object):
vals = []
# For phandles, output a reference to the platform data
# of the target node.
- if self.is_phandle(prop):
+ info = self.get_phandle_argc(prop, node.name)
+ if info:
# Process the list as pairs of (phandle, id)
value_it = iter(prop.value)
for phandle_cell, id_cell in zip(value_it, value_it):
diff --git a/tools/dtoc/dtoc_test_phandle.dts b/tools/dtoc/dtoc_test_phandle.dts
index e9828a6..c0a602f 100644
--- a/tools/dtoc/dtoc_test_phandle.dts
+++ b/tools/dtoc/dtoc_test_phandle.dts
@@ -13,6 +13,7 @@
u-boot,dm-pre-reloc;
compatible = "target";
intval = <1>;
+ #clock-cells = <1>;
};
phandle-source {