Re: [PATCH v3 0/7] of: setup dma parameters using dma-ranges and dma-coherent

Grant Likely
2014-05-14T10:12:33Z

On Thu, 1 May 2014 14:25:16 +0100, Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:
> On Thu, May 01, 2014 at 09:19:18AM -0400, Santosh Shilimkar wrote:
> > Rob, Russell,
> >
> > On Thursday 24 April 2014 11:30 AM, Santosh Shilimkar wrote:
> > > Here is an updated v3 of the series. Series introduces support for setting up
> > > dma parameters based on device tree properties like 'dma-ranges' and
> > > 'dma-coherent' and also update to ARM 32 bit port. Earlier version of the
> > > series can be found here [3], [2] and [1].
> > >
> > > The 'dma-ranges' helps to take care of few DMAable system memory restrictions
> > > by use of dma_pfn_offset which we maintain now per device. Arch code then
> > > uses it for dma address translations for such cases. We update the
> > > dma_pfn_offset accordingly during DT the device creation process.The
> > > 'dma-coherent' property is used to setup arch's coherent dma_ops.
> > >
> > > Hopefully with acks, tested-by this version can get into 3.16 queue. I will
> > > post a followup series for Keystone SOC which will use this infrastructure.
> > > Linus W also wants to use this for ARM integrator platform dma offset issue.
> > >
> > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > Cc: Russell King <linux@arm.linux.org.uk>
> > > Cc: Arnd Bergmann <arnd@arndb.de>
> > > Cc: Olof Johansson <olof@lixom.net>
> > > Cc: Grant Likely <grant.likely@linaro.org>
> > > Cc: Rob Herring <robh+dt@kernel.org>
> > > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > > Cc: Linus Walleij <linus.walleij@linaro.org>
> > > Cc: Grygorii Strashko <grygorii.strashko@ti.com>
> > >
> > > Grygorii Strashko (2):
> > > of: introduce of_dma_get_range() helper
> > > ARM: dma: Use dma_pfn_offset for dma address translation
> > >
> > > Santosh Shilimkar (5):
> > > device: introduce per device dma_pfn_offset
> > > of: introduce of_dma_is_coherent() helper
> > > of: configure the platform device dma parameters
> > > ARM: dma: implement set_arch_dma_coherent_ops()
> > > ARM: dma: use phys_addr_t in __dma_page_[cpu_to_dev/dev_to_cpu]
> > >
> > > arch/arm/include/asm/dma-mapping.h | 28 ++++++++++--
> > > arch/arm/mm/dma-mapping.c | 4 +-
> > > drivers/of/address.c | 87 ++++++++++++++++++++++++++++++++++++
> > > drivers/of/platform.c | 71 +++++++++++++++++++++++++++--
> > > include/linux/device.h | 2 +
> > > include/linux/dma-mapping.h | 7 +++
> > > include/linux/of_address.h | 8 ++++
> > > include/linux/of_platform.h | 6 +++
> > > 8 files changed, 204 insertions(+), 9 deletions(-)
> > >
> > How do we go about merging this series ? There is a dependency
> > between the patches and hence the question.
>
> I don't know anymore. People today want to assert exclusive rights over
> parts of the kernel tree, which makes this kind of cross-patching rather
> impossible.

And you can tell those people to go-perch. (I have no idea what that
actually means. something my mother always says).

If everyone is okay then I would be fine with taking the whole series
through my tree, or you can put my ack on it and send it through the ARM tree.

g.
>
> The only workable solution I can see is the long winded way to split the
> series up, merge the first set of dependencies in one merge window, and
> hold the rest back for the following merge window. Not ideal, but it
> stops the arguments.
>
> --
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