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spi: docs: update info about 'delay_usecs'

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The 'delay_usecs' field is no longer present on the spi_transfer struct.
This change updates the doc to mention the usage of the (relatively) new
'delay' field.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210308145502.1075689-11-aardelean@deviqon.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Alexandru Ardelean 2021-03-08 16:55:02 +02:00 committed by Mark Brown
parent 3ab1cce553
commit 05d8a019eb
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1 changed files with 5 additions and 2 deletions
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7
Documentation/spi/spi-summary.rst
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@ -411,8 +411,11 @@ any more such messages.
duplex (one pointer is NULL) transfers;
+ optionally defining short delays after transfers ... using
the spi_transfer.delay_usecs setting (this delay can be the
only protocol effect, if the buffer length is zero);
the spi_transfer.delay.value setting (this delay can be the
only protocol effect, if the buffer length is zero) ...
when specifying this delay the default spi_transfer.delay.unit
is microseconds, however this can be adjusted to clock cycles
or nanoseconds if needed;
+ whether the chipselect becomes inactive after a transfer and
any delay ... by using the spi_transfer.cs_change flag;