linux-kernel - [PATCH 0/4] dw_dmac: introduce generic DMA binding for DT

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Date:	Fri, 15 Feb 2013 19:21:48 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <djbw@...com>, linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 0/4] dw_dmac: introduce generic DMA binding for DT

Hi Vinod,

As Andy pointed out today, we don't have a good solution for the
dw_dmac DT binding in linux-next yet. I have posted my series
once before and then got distracted after getting feedback from
Viresh, Andy and Russell. I have now updated my earlier patch
based on the feedback and rebased on your tree without any
of the arm-soc patches mixed in.

Unfortunately the patches have never been tested on real hardware 
so I don't think it's a good idea to use them in v3.9 on the
spear platform. However, your dma-slave tree still contains Viresh's
earlier patches, causing a few problems:

* With those patches, the spear3xx platform currently does not build.
  (this one would be easy to fix though)
* There is a conflict between those patches and my spear multiplatform
  series, which I have not yet queued up for 3.9 because of this,
  since that would have meant that Stephen Rothwell would have to
  discard either the arm-soc tree or the dma-slave tree from linux-next.
* I really don't want the broken binding to appear in 3.9.

I believe the best way out at this point is this series, which first
first reverts the patch f9965aa2 "ARM: SPEAr13xx: Pass DW DMAC
platform data from DT" from your tree and then adds my update.

This will give us the right DT binding for dw-dmac but no in-tree
users, which means that nothing should break if I get it slightly
wrong. Please apply the first two patches from these set, and
optionally the two patches that based on this convert the pl011
uart and pl022 spi controller drivers.

I can then decide with Olof whether or not to take the spear multiplatform
changes that no longer conflict with the dma slave tree as a "late"
branch into 3.9 or wait until 3.10, but that is something you don't
need to worry about then. Also the conversion of spear to use
the new binding (patch 5 of my original series) can go through the 
arm-soc tree for 3.10 after the ST folks have tested that it works.

	Arnd

Arnd Bergmann (4):
  Revert "ARM: SPEAr13xx: Pass DW DMAC platform data from DT"
  dmaengine: dw_dmac: move to generic DMA binding
  spi: pl022: use generic DMA slave configuration if possible
  serial: pl011: use generic DMA slave configuration if possible

 .../devicetree/bindings/arm/primecell.txt          |  19 ++-
 Documentation/devicetree/bindings/dma/snps-dma.txt |  70 ++++++-----
 Documentation/devicetree/bindings/serial/pl011.txt |  17 +++
 .../devicetree/bindings/spi/spi_pl022.txt          |  36 ++++++
 arch/arm/boot/dts/spear1340.dtsi                   |  19 ---
 arch/arm/boot/dts/spear13xx.dtsi                   |  38 ------
 arch/arm/mach-spear13xx/include/mach/spear.h       |   2 +
 arch/arm/mach-spear13xx/spear1310.c                |   5 +-
 arch/arm/mach-spear13xx/spear1340.c                |  33 +++--
 arch/arm/mach-spear13xx/spear13xx.c                |  55 ++++++++-
 drivers/dma/dw_dmac.c                              | 137 ++++++++++-----------
 drivers/dma/dw_dmac_regs.h                         |   8 +-
 drivers/spi/spi-pl022.c                            |  43 ++++++-
 drivers/tty/serial/amba-pl011.c                    |  62 ++++++----
 include/linux/dw_dmac.h                            |   5 -
 15 files changed, 333 insertions(+), 216 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/serial/pl011.txt

-- 
1.8.1.2

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