Update formatting rules

buildroot/share/extras/uncrustify.cfg

 # Spaces to indent '{' from 'case'.
 # By default, the brace will appear under the 'c' in case.
 # Usually set to 0 or indent_columns.
-indent_case_brace = 4
+indent_case_brace = 0
 
 # Spaces to indent 'case' from 'switch'
 # Usually 0 or indent_columns.
-indent_switch_case = 4
+indent_switch_case = 2
+
+# indent 'break' with 'case' from 'switch'.
+indent_switch_break_with_case = false
+
+# Whether to indent continued function call parameters one indent level,
+# rather than aligning parameters under the open parenthesis.
+indent_func_call_param = true
+
+# Whether to indent continued function definition parameters one indent level,
+# rather than aligning parameters under the open parenthesis.
+indent_func_def_param = true
+
+# Add or remove space between function name and '(' on function declaration.
+sp_func_proto_paren = remove
+
+# Add or remove space between function name and '(' on function calls.
+sp_func_call_paren = remove
 
 # Add or remove space around arithmetic operator '+', '-', '/', '*', etc
 sp_arith = force
 sp_inside_sparen = remove
 
 # Add or remove space between 'else' and '{' if on the same line
-sp_else_brace = force
+sp_else_brace = add
 
 # Add or remove space between '}' and 'else' if on the same line
-sp_brace_else = force
+sp_brace_else = add
 
 # Add or remove space inside a non-empty '[' and ']'
 sp_inside_square = remove
 
 # Add or remove space before '(' of 'if', 'for', 'switch', and 'while'
-sp_before_sparen = force
+sp_before_sparen = add
 
 # Add or remove space after ','
-sp_after_comma = force
+sp_after_comma = add
 
 # Add or remove space before ','
 sp_before_comma = remove
 
 # Add or remove space between ')' and '{'
-sp_paren_brace = force
+sp_paren_brace = add
+
+# Add or remove space between ')' and '{' of function.
+sp_fparen_brace = add
 
 # Add or remove space after ')' of 'if', 'for', 'switch', and 'while'
-sp_after_sparen  = force
+sp_after_sparen  = add
 
 # Add or remove space after ';', except when followed by a comment. Default=Add
-sp_after_semi = force
+sp_after_semi = add
 
 # Add or remove newline between '}' and 'else'
-nl_brace_else = force
+nl_brace_else = add
 
 # Add or remove newline between 'enum' and '{'
 nl_enum_brace = remove
 # Add or remove newline between function signature and '{'
 nl_fdef_brace = remove
 
+# Whether to collapse a function definition whose body (not counting braces)
+# is only one line so that the entire definition (prototype, braces, body) is
+# a single line.
+nl_create_func_def_one_liner = true
+
 # Whether to remove blank lines after '{'
-eat_blanks_after_open_brace = true
+eat_blanks_after_open_brace = false
 
 # Whether to remove blank lines before '}'
 eat_blanks_before_close_brace = false
 # Whether to remove superfluous semicolons
 mod_remove_extra_semicolon = true
 
-# If an #ifdef or #else body exceeds the specified number of newlines and
-# doesn't have a comment after the #else, a comment will be added.
-mod_add_long_ifdef_else_comment = 40
-
-
 # Whether to put a newline after a brace close.
 # Does not apply if followed by a necessary ';'.
 nl_after_brace_close = true
 # Default is true.
 cmt_indent_multi = false
 
+#
+# Indent all code and preprocessor directives together
+# to remove all ambiguity and permit code folding.
+# TODO: Reduce indent at the "whole file" level.
+#
+
 # Add or remove indentation of preprocessor directives inside #if blocks
 # at brace level 0 (file-level).
 pp_indent = add
 # indented from column 1.
 pp_indent_at_level = true
 
+# Whether to indent '#define' at the brace level. If false, these are
+# indented from column 1.
+pp_define_at_level = true
+
 # If pp_indent_at_level=true, sets the indent for #if, #else and #endif when
 # not at file-level. Negative values decrease indent down to the first column.
 #
 # Default: 1
 pp_indent_count = 2
 
-
-# Whether to indent '#define' at the brace level. If false, these are
-# indented from column 1.
-pp_define_at_level = true
-
 # Whether to ignore the '#define' body while formatting.
 pp_ignore_define_body = true
 
+# Whether to indent extern C blocks between #if, #else, and #endif.
+# Only applies to the indent of the preprocesser that the extern block is
+# directly inside of.
+#
+# Default: true
+pp_indent_extern = false
+
+# Whether to indent braces directly inside #if, #else, and #endif.
+# Only applies to the indent of the preprocesser that the braces are directly
+# inside of.
+#
+# Default: true
+pp_indent_brace = false
+
+# If an #ifdef body exceeds the specified number of newlines and doesn't have
+# a comment after the #endif, a comment will be added.
+mod_add_long_ifdef_endif_comment = 40
+
+# If an #ifdef or #else body exceeds the specified number of newlines and
+# doesn't have a comment after the #else, a comment will be added.
+mod_add_long_ifdef_else_comment = 40
+
+# Whether to remove blanks after '#ifxx' and '#elxx', or before '#elxx' and
+# '#endif'. Does not affect top-level #ifdefs.
+nl_squeeze_ifdef = true
+
 #
 # Newline adding and removing options
 #