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Subject[PATCH v4 00/19] spi: introduce `struct spi_delay` data-type
Initially, I started this patchset thinking: "we need a new delay for
something-something" (in case someone is curios, we needed a CS-hold-time
when CS is asserted, because the CS wakes a chip from sleep-mode).

Then I added the delay, and felt a bit dirty-inside about adding a new one
(just like that), and decided to look at maybe cleaning things up a bit,
and a few days/weeks later, I got here.

It's based on top of Jonathan's `iio/togreg` branch which also includes the
ADIS driver library changes for `cs_change_delay`.

The current v4 tries to be a complete change as possible about converting
all delays to the `struct delay` data-type; at least in the scope of the
SPI subsystem. Many external users of the SPI subsystem use the
`delay_usecs` field to specify delays for transfers; which is why this
field is still kept temporarily for backwards compatibility until all other
delays are switched to `delay`.


Changelog v3 -> v4:
* re-unify all `spi_delay` changes into a single big series spanning SPI &
IIO subsystems; patches are based on top of IIO, so patch
`drivers/iio/imu/adis.c` does not apply on top of SPI/for-next tree

Changelog v2 -> v3:
* squash patches 3 & 4 into a single patch; otherwise the kernel is in
broken state between those 2 patches

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.

Alexandru Ardelean (19):
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
spi: sprd: convert transfer word delay to spi_delay struct
spi: orion: use new `word_delay` field for SPI transfers
spi: spidev: use new `word_delay` field for spi transfers
spi: core,atmel: convert `word_delay_usecs` -> `word_delay` for
spi: introduce `delay` field for `spi_transfer` +
spi: use new `spi_transfer_delay_exec` helper where straightforward
spi: tegra114: use `spi_transfer_delay_exec` helper
spi: tegra20-sflash: use to new `spi_transfer_delay_exec`
spi: spi-loopback-test: use new `delay` field
spi: spidev: use new `delay` field for spi transfers
spi: tegra114: change format for `spi_set_cs_timing()` function
spi: implement SW control for CS times
spi: spi-fsl-espi: convert transfer delay to `spi_delay` format
spi: spi-falcon: extend warning to `delay` as well
spi: bcm63xx: extend error condition to `delay` as well
spi: spi-axi: extend support for the `delay` field

drivers/iio/imu/adis.c | 24 ++---
drivers/spi/spi-atmel.c | 29 +++++-
drivers/spi/spi-axi-spi-engine.c | 16 +++-
drivers/spi/spi-bcm63xx-hsspi.c | 3 +-
drivers/spi/spi-bcm63xx.c | 2 +-
drivers/spi/spi-cavium.c | 3 +-
drivers/spi/spi-falcon.c | 2 +-
drivers/spi/spi-fsl-dspi.c | 3 +-
drivers/spi/spi-fsl-espi.c | 19 +++-
drivers/spi/spi-fsl-spi.c | 3 +-
drivers/spi/spi-loopback-test.c | 12 ++-
drivers/spi/spi-mpc512x-psc.c | 3 +-
drivers/spi/spi-mpc52xx-psc.c | 3 +-
drivers/spi/spi-omap-100k.c | 3 +-
drivers/spi/spi-orion.c | 6 +-
drivers/spi/spi-pl022.c | 25 +++--
drivers/spi/spi-sc18is602.c | 3 +-
drivers/spi/spi-sh-hspi.c | 3 +-
drivers/spi/spi-sprd.c | 15 ++-
drivers/spi/spi-tegra114.c | 39 ++++----
drivers/spi/spi-tegra20-sflash.c | 5 +-
drivers/spi/spi-topcliff-pch.c | 7 +-
drivers/spi/spi-txx9.c | 3 +-
drivers/spi/spi-xcomm.c | 3 +-
drivers/spi/spi.c | 158 +++++++++++++++++++++++++------
drivers/spi/spidev.c | 6 +-
include/linux/spi/spi.h | 66 +++++++++----
27 files changed, 323 insertions(+), 141 deletions(-)


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