i2c: add helpers to ease DMA handling

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One helper checks if DMA is suitable and optionally creates a bounce
buffer, if not. The other function returns the bounce buffer and makes
sure the data is properly copied back to the message.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Wolfram Sang 2017-11-04 21:20:02 +01:00 • committed by Wolfram Sang

parent 521a72e1f2

commit e94bc5d18b

2 changed files with 49 additions and 0 deletions

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46

drivers/i2c/i2c-core-base.c

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3

include/linux/i2c.h

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