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cmake: dts: Add dt_comp_path() cmake function

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Add a new cmake extension function:

  dt_comp_path(<var> COMPATIBLE <compatible> [INDEX <idx>])

to get a list of paths for the nodes with the given <compatible>. This
is useful when we have to cycle through several nodes with the same
compatible.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2022-02-02 14:41:38 +01:00 • committed by Anas Nashif
commit 3c0c03b9eb
2 changed files with 69 additions and 0 deletions
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54
cmake/extensions.cmake
View file

@ -2855,6 +2855,60 @@ function(dt_prop var)
endif()
endfunction()
# Usage:
#
# dt_comp_path(<var> COMPATIBLE <compatible> [INDEX <idx>])
#
# Get a list of paths for the nodes with the given compatible. The value will
# be returned in the <var> parameter.
# <var> will be undefined if no such compatible exists.
#
# For details and considerations about the format of <path> and the returned
# parameter refer to dt_prop().
#
# <var> : Return variable where the property value will be stored
# COMPATIBLE <compatible>: Compatible for which the list of paths should be
# returned, as it appears in the DTS source
# INDEX <idx> : Optional index when retrieving a value in an array property
function(dt_comp_path var)
set(req_single_args "COMPATIBLE")
set(single_args "INDEX")
cmake_parse_arguments(DT_COMP "" "${req_single_args};${single_args}" "" ${ARGN})
if(${ARGV0} IN_LIST req_single_args)
message(FATAL_ERROR "dt_comp_path(${ARGV0} ...) missing return parameter.")
endif()
foreach(arg ${req_single_args})
if(NOT DEFINED DT_COMP_${arg})
message(FATAL_ERROR "dt_comp_path(${ARGV0} ...) "
"missing required argument: ${arg}"
)
endif()
endforeach()
get_property(exists TARGET devicetree_target
PROPERTY "DT_COMP|${DT_COMP_COMPATIBLE}"
SET
)
if(NOT exists)
set(${var} PARENT_SCOPE)
return()
endif()
get_target_property(val devicetree_target
"DT_COMP|${DT_COMP_COMPATIBLE}"
)
if(DEFINED DT_COMP_INDEX)
list(GET val ${DT_COMP_INDEX} element)
set(${var} "${element}" PARENT_SCOPE)
else()
set(${var} "${val}" PARENT_SCOPE)
endif()
endfunction()
# Usage:
# dt_num_regs(<var> PATH <path>)

15
scripts/dts/gen_dts_cmake.py
View file

@ -43,6 +43,7 @@ import argparse
import os
import pickle
import sys
from collections import defaultdict
sys.path.append(os.path.join(os.path.dirname(__file__), 'python-devicetree',
'src'))
@ -95,6 +96,7 @@ def main():
for alias in node.aliases:
cmake_props.append(f'"DT_ALIAS|{alias}" "{path}"')
compatible2paths = defaultdict(list)
for node in edt.nodes:
cmake_props.append(f'"DT_NODE|{node.path}" TRUE')
@ -117,6 +119,11 @@ def main():
cmake_prop = f'DT_PROP|{node.path}|{item}'
cmake_props.append(f'"{cmake_prop}" "{cmake_value}"')
if item == 'compatible':
# compatibles is always an array
for comp in node.props[item].val:
compatible2paths[comp].append(node.path)
if node.regs is not None:
cmake_props.append(f'"DT_REG|{node.path}|NUM" "{len(node.regs)}"')
cmake_addr = ''
@ -136,6 +143,14 @@ def main():
cmake_props.append(f'"DT_REG|{node.path}|ADDR" "{cmake_addr}"')
cmake_props.append(f'"DT_REG|{node.path}|SIZE" "{cmake_size}"')
for comp in compatible2paths.keys():
cmake_path = ''
for path in compatible2paths[comp]:
cmake_path = f'{cmake_path}{path};'
cmake_comp = f'DT_COMP|{comp}'
cmake_props.append(f'"{cmake_comp}" "{cmake_path}"')
with open(args.cmake_out, "w", encoding="utf-8") as cmake_file:
print('add_custom_target(devicetree_target)', file=cmake_file)
print(file=cmake_file)