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

From: Philipp Zabel
Date: Mon Sep 29 2014 - 04:16:35 EST


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
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,

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


Philipp Zabel (8):
[media] soc_camera: Do not decrement endpoint node refcount in the
imx-drm: Do not decrement endpoint node refcount in the loop
of: Decrement refcount of previous endpoint in
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: use for_each_endpoint_of_node macro in

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(-)


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