[PATCH v4 0/8] Add of-graph helpers to loop over endpoints and find ports by id

[Philipp Zabel <p.zabel@pengutronix.de>]

Hi,

in theory, I'd like the first five patches to go in together through Grant's
tree, but in practice that might not be necessary; changes in of_node
reference counting are only relevant if CONFIG_OF_DYNAMIC is enabled.
Since patch 2 depends on (or would trivially conflict with) 30e94a564d07
in the staging tree, it might be better to merge this one through staging.
What do you think?

The three 'use for_each_endpoint_of_node macro in ...' patches can be resent
later, separately.

This series converts all existing users of of_graph_get_next_endpoint that pass
a non-NULL prev argument to the function and decrement its refcount themselves
to stop doing that. The of_node_put is moved into of_graph_get_next_endpoint
instead.
This allows to add a for_each_endpoint_of_node helper macro to loop over all
endpoints in a device tree node.
The third of patch adds a of_graph_get_port_by_id function to retrieve a port
by its known port id from the device tree.
Finally, the last three patches convert functions in drm_of.c and imx-drm-core.c
to use the for_each_endpoint_of_node macro instead of of_graph_get_next_endpoint.

Changes since v3:
 - Moved of_node_put for the break case after the loop in patch 1 and 8
 - Rebased patch 2 on top of 30e94a564d07 (staging: imx-drm: Lines over 80
   characters fixed.), which added a blank line in the function we remove,
   imx_drm_of_get_next_endpoint.

The previous version can be found here: https://lkml.org/lkml/2014/9/11/696

regards
Philipp

Philipp Zabel (8):
  [media] soc_camera: Do not decrement endpoint node refcount in the
    loop
  imx-drm: Do not decrement endpoint node refcount in the loop
  of: Decrement refcount of previous endpoint in
    of_graph_get_next_endpoint
  of: Add for_each_endpoint_of_node helper macro
  of: Add of_graph_get_port_by_id function
  drm: use for_each_endpoint_of_node macro in drm_of_find_possible_crtcs
  imx-drm: use for_each_endpoint_of_node macro in
    imx_drm_encoder_get_mux_id
  imx-drm: use for_each_endpoint_of_node macro in
    imx_drm_encoder_parse_of

 drivers/gpu/drm/drm_of.c                       |  8 ++----
 drivers/media/platform/soc_camera/soc_camera.c |  3 ++-
 drivers/of/base.c                              | 35 ++++++++++++++++++++------
 drivers/staging/imx-drm/imx-drm-core.c         | 29 ++++++---------------
 include/linux/of_graph.h                       | 18 +++++++++++++
 5 files changed, 56 insertions(+), 37 deletions(-)

-- 
2.1.0