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    Subject[PATCH v3 0/4] i2c: document DMA handling and add helpers for it
    Date
    So, after revisiting old mail threads and taking part in a similar discussion
    on the USB list, here is what I cooked up to document and ease DMA handling for
    I2C within Linux. Please have a look at the documentation introduced in patch 2
    for further details.

    All patches have been tested with a Renesas Salvator-X board (r8a7796/M3-W) and
    a Renesas Lager board (r8a7790/H2). A more detailed test description can be
    found here: http://elinux.org/Tests:I2C-core-DMA

    The branch can be found here:

    git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/topic/i2c-core-dma-v3

    And big kudos to Renesas Electronics for funding this work, thank you very much!

    Regards,

    Wolfram


    Changes since v2:

    * rebased to v4.13-rc1
    * helper functions are not inlined anymore but moved to i2c core
    * __must_check has been added to the buffer check helper
    * the release function has been renamed to contain 'dma' as well
    * documentation updates. Hopefully better wording now
    * removed the doubled Signed-offs
    * adding more potentially interested parties to CC


    Wolfram Sang (4):
    i2c: add helpers to ease DMA handling
    i2c: add docs to clarify DMA handling
    i2c: sh_mobile: use helper to decide if DMA is useful
    i2c: rcar: check for DMA-capable buffers

    Documentation/i2c/DMA-considerations | 38 ++++++++++++++++++++
    drivers/i2c/busses/i2c-rcar.c | 18 +++++++---
    drivers/i2c/busses/i2c-sh_mobile.c | 8 +++--
    drivers/i2c/i2c-core-base.c | 68 ++++++++++++++++++++++++++++++++++++
    include/linux/i2c.h | 5 +++
    5 files changed, 130 insertions(+), 7 deletions(-)
    create mode 100644 Documentation/i2c/DMA-considerations

    --
    2.11.0

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