OF: base: sync of_find_node_by_path with linux OF API ...

Barebox of_find_node_by_path requires a node to be passed as start node
to start searching. Linux OF API does not pass this node and no current
user of it in barebox is passing anything else than the root node.
Therefore, we rename current function to of_find_node_by_path_from and
introduce a Linux OF API compatible of_find_node_by_path that always
passes the current root_node. Also, all current users of that function
are updated to reflect the API change.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

OF: base: sync of_find_property with linux OF API ...

To start synchronizing OF API of barebox with linux OF API, this adds
a length pointer to of_find_property. Also all current users of that
function are updated to reflect the API change.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

of: property: fix error message ...

At least in standard oxford english one not is enough.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: remove unused libfdt ...

Now that we are completely independent of libfdt remove the unused
code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_property command: Fix crash with empty property value ...

the of_property command crashes when an empty property value
was given. This is because xrealloc is called with a length
argument of 0. Fix this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_* commands: print usage when insufficient arguments are given ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: Add root node argument to of_find_node_by_path ...

This makes of_find_node_by_path usable with multiple trees.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: Add of_property command ...

The of_property command allows to modify/add/delete properties.
Parsing user input is based on U-Boot code with some fixes added
for catching invalid input.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>