Messages in this thread | | | From | Jonas Bonn <> | Subject | [PATCH v6 0/2] spi: support inter-word delays | Date | Wed, 30 Jan 2019 09:40:03 +0100 |
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Changed in v6: * Changed name of field word_delay_us to word_delay_usecs as per suggestion in patch review * Add Nicolas' ACK to spi-atmel patch
Changed in v5: * Rebased on linux-next * Fixed up Atmel patch to simplify register setting
Changed in v4: * Rename word_delay to word_delay_us and slot it in _beside_ the existing word_delay parameter in spi_transfer (see commit message for more info). * Add code to __spi_validate to make sure transfer and device align with respect to the word_delay_us parameter
Changed in v3: * Drop setting of inter-word delay via device tree
Changed in v2: * Fix atmel-spi driver to not unconditionally set minimal delay if no delay is required (erroneous clamping)
This short series adds support for SPI inter-word delays and configures the spi-atmel driver to honour the setting.
Some SPI slaves are so slow that they are unable to keep up even at the SPI controller's lowest available clock frequency. I have such a configuration where an AVR-based SPI slave is unable to feed the SPI bus fast enough even the SPI master runs at the lowest possible clock speed.
Jonas Bonn (2): spi: support inter-word delay requirement for devices spi-atmel: support inter-word delay
drivers/spi/spi-atmel.c | 11 ++++++----- drivers/spi/spi.c | 5 +++++ include/linux/spi/spi.h | 6 ++++++ 3 files changed, 17 insertions(+), 5 deletions(-)
-- 2.19.1
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