linux-kernel - [PATCH v4 0/4] drm: Cleanup probe function for component based masters.

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Message-Id: <1445332995-11212-1-git-send-email-Liviu.Dudau@arm.com>
Date:	Tue, 20 Oct 2015 10:23:11 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Mark Yao <mark.yao@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <rmk+kernel@....linux.org.uk>
Cc:	dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-rockchip <linux-rockchip@...ts.infradead.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 0/4] drm: Cleanup probe function for component based masters.

Changelog:
v4: Fixed a bug where the wrong pointer was sent to component_match_add() and
    component_master_add_with_match() in the armada_drv.c file that was flagged
    by kbuild test robot. Dropped the RFC tag and added Acked-bys received from
    Russell King.
v3: Removed the call to dma_set_coherent_mask() from the generic
    drm_of_component_probe(). Also changes to shorten lines over 80 chars long.
v2: Rebased the patchset on top of drm-next rather than Linus' latest -rc

A few drivers in drivers/gpu/drm are component-enabled and use quite similar
code sequences to probe for their encoder slaves at the remote end of the ports.
Move the code into a "generic" function and remove it from the drivers.

The end results is that drivers get a reference count fix (imx), more thorough
error checking (imx again) plus a decrease in the overall count of LoC.

I'm looking for comments and testing of the patchset (only compile tested from my
end as I don't have access to all the devices touched by the changes). My main
interest is in finding out if -EINVAL is the correct code to return if
dev->of_node == NULL (handy now, as it is different from the other possible error
codes and used in armada to trigger old platform_data support. Also looking for
thoughts on the correctness of the patch and if it possible to co-opt more drivers
into using the function.

Best regards,
Liviu

Liviu Dudau (4):
  drm: Introduce generic probe function for component based masters.
  drm/imx: Convert the probe function to the generic drm_of_component_probe()
  drm/rockchip: Convert the probe function to the generic drm_of_component_probe()
  drm/armada: Convert the probe function to the generic drm_of_component_probe()

 drivers/gpu/drm/armada/armada_drv.c         | 68 +++++++---------------
 drivers/gpu/drm/drm_of.c                    | 88 +++++++++++++++++++++++++++++
 drivers/gpu/drm/imx/imx-drm-core.c          | 55 ++----------------
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 81 ++------------------------
 include/drm/drm_of.h                        | 13 +++++
 5 files changed, 130 insertions(+), 175 deletions(-)

-- 
2.6.0

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