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spi: introduce delay field for spi_transfer + spi_transfer_delay_exec()

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The change introduces the `delay` field to the `spi_transfer` struct as an
`struct spi_delay` type.
This intends to eventually replace `delay_usecs`.

But, since there are many users of `delay_usecs`, this needs some
intermediate work.
A helper called `spi_transfer_delay_exec()` is also added, which maintains
backwards compatibility with `delay_usecs`, by assigning the value to
`delay` if non-zero.
This should maintain backwards compatibility with current users of
`udelay_usecs`.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-9-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexandru Ardelean
2019-09-26 13:51:36 +03:00
committed by Mark Brown
parent 6c613f68aa
commit bebcfd272d
2 changed files with 21 additions and 3 deletions
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6
drivers/spi/spi.c
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@ -1248,8 +1248,7 @@ static int spi_transfer_one_message(struct spi_controller *ctlr,
if (msg->status != -EINPROGRESS)
goto out;
if (xfer->delay_usecs)
_spi_transfer_delay_ns(xfer->delay_usecs * 1000);
spi_transfer_delay_exec(xfer);
if (xfer->cs_change) {
if (list_is_last(&xfer->transfer_list,
@ -3026,10 +3025,11 @@ struct spi_replaced_transfers *spi_replace_transfers(
/* add to list */
list_add(&xfer->transfer_list, rxfer->replaced_after);
/* clear cs_change and delay_usecs for all but the last */
/* clear cs_change and delay for all but the last */
if (i) {
xfer->cs_change = false;
xfer->delay_usecs = 0;
xfer->delay.value = 0;
}
}