[PATCH v2 0/4] spi: introduce `struct spi_delay` data-type

From: Alexandru Ardelean
Date: Fri Sep 13 2019 - 04:56:08 EST

Discussion reference:

This changeset introduces an `spi_delay` struct/data-type and makes the
IIO ADIS driver library the first user of this.

The patchset base is Jonathan's `iio/togreg` branch, but it also applies on
Mark's `spi/for-next` branch.

The reasons for choosing `cs_change_delay`, is:
1. this change introduces delay units
2. it is not yet widely used, meaning it can still be changed

Some delays like `delay` from `spi_transfer` would require a longer
update-time change & discussion.

Alexandru Ardelean (4):
spi: move `cs_change_delay` backwards compat logic outside switch
spi: introduce spi_delay struct as "value + unit" & spi_delay_exec()
spi: make `cs_change_delay` the first user of the `spi_delay` logic
iio: imu: adis: convert cs_change_delay to spi_delay struct

drivers/iio/imu/adis.c | 24 +++++++--------
drivers/spi/spi.c | 68 +++++++++++++++++++++++++++++++----------
include/linux/spi/spi.h | 22 +++++++++----
3 files changed, 80 insertions(+), 34 deletions(-)


Changelog v1 -> v2:
* split away from the RFC patchset, which aims to be a broader explanation
for this changeset; parts of v1 are not 100% defined yet, and may require
some discussion and refinement.