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

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Message-Id: <1411978551-30480-1-git-send-email-p.zabel@pengutronix.de>
Date:	Mon, 29 Sep 2014 10:15:43 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	devel@...verdev.osuosl.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 v4 0/8] Add of-graph helpers to loop over endpoints and find ports by id

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

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