linux-kernel - [PATCH v2 0/8] Add of-graph helpers to loop over endpoints and find ports by id

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Date:	Wed, 10 Sep 2014 12:58:20 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	kernel@...gutronix.de, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v2 0/8] Add of-graph helpers to loop over endpoints and find ports by id

Hi,

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 v1:
 - Added a comment about the child node reference count when breaking out
   of the loop of for_each_endpoint_of_node.
 - Changed id parameter to of_graph_get_port_by_id to u32
 - Simplified of_graph_get_port_by_id as suggested by Laurent,
   making use of port id defaulting to 0 if no "reg" property is given.
 - Added Laurent's ack to drm_of_find_possible_crtcs patch

The previous version can be found here: https://lkml.org/lkml/2014/8/19/280

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 |  2 +-
 drivers/of/base.c                              | 35 ++++++++++++++++++++------
 drivers/staging/imx-drm/imx-drm-core.c         | 34 ++++++++-----------------
 include/linux/of_graph.h                       | 18 +++++++++++++
 5 files changed, 58 insertions(+), 39 deletions(-)

-- 
2.1.0

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