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    Subject[PATCH v4 5/6] docs: bootconfig: Update for mixing value and subkeys
    Date
    Update document for the mixing value and subkeys on a key.

    Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
    ---
    Changes in v2:
    - Update an example of mixing value and subkeys.
    ---
    Documentation/admin-guide/bootconfig.rst | 30 ++++++++++++++++++++++++++----
    1 file changed, 26 insertions(+), 4 deletions(-)

    diff --git a/Documentation/admin-guide/bootconfig.rst b/Documentation/admin-guide/bootconfig.rst
    index 452b7dcd7f6b..6a79f2e59396 100644
    --- a/Documentation/admin-guide/bootconfig.rst
    +++ b/Documentation/admin-guide/bootconfig.rst
    @@ -89,13 +89,35 @@ you can use ``+=`` operator. For example::

    In this case, the key ``foo`` has ``bar``, ``baz`` and ``qux``.

    -However, a sub-key and a value can not co-exist under a parent key.
    -For example, following config is NOT allowed.::
    +Moreover, sub-keys and a value can coexist under a parent key.
    +For example, following config is allowed.::

    foo = value1
    - foo.bar = value2 # !ERROR! subkey "bar" and value "value1" can NOT co-exist
    - foo.bar := value2 # !ERROR! even with the override operator, this is NOT allowed.
    + foo.bar = value2
    + foo := value3 # This will update foo's value.
    +
    +Note, since there is no syntax to put a raw value directly under a
    +structured key, you have to define it outside of the brace. For example::
    +
    + foo {
    + bar = value1
    + bar {
    + baz = value2
    + qux = value3
    + }
    + }
    +
    +Also, the order of the value node under a key is fixed. If there
    +are a value and subkeys, the value is always the first child node
    +of the key. Thus if user specifies subkeys first, e.g.::
    +
    + foo.bar = value1
    + foo = value2
    +
    +In the program (and /proc/bootconfig), it will be shown as below::

    + foo = value2
    + foo.bar = value1

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