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Subject[PATCH v3 0/4] i2c: document DMA handling and add helpers for it
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:

The branch can be found here:

git:// renesas/topic/i2c-core-dma-v3

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



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


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