Re: [PATCH 0/4] dw_dmac: introduce generic DMA binding for DT
From: Vinod Koul
Date: Wed Feb 20 2013 - 03:04:38 EST
On Fri, Feb 15, 2013 at 07:21:48PM +0100, Arnd Bergmann wrote:
> 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.
Since there is still churn, would it make sense if I just revert the SPEAr13xx
patch (your first patch) and send a pull request to Linus.
Since there are no users and not much testing has been done, I think we can push
these to 3.10 via arm-soc/slave-dma tree.
Gives more testing and usage will go along as well.
Since merge window is open, I would like my pull to go soonish and not churn the
> 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 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
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