diff options
| author | David Lechner <dlechner@baylibre.com> | 2025-02-07 14:08:59 -0600 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-02-07 20:17:08 +0000 |
| commit | d7231be4b4657e5f922a4c6dc11e8dffc71fee87 (patch) | |
| tree | 7d05466ee5f89c58b6ccaca2cfe61f4b65bfd342 /include/linux/spi/offload/consumer.h | |
| parent | 8e02d188698851436f76038ea998b726193d1b10 (diff) | |
spi: offload: add support for hardware triggers
Extend SPI offloading to support hardware triggers.
This allows an arbitrary hardware trigger to be used to start a SPI
transfer that was previously set up with spi_optimize_message().
A new struct spi_offload_trigger is introduced that can be used to
configure any type of trigger. It has a type discriminator and a union
to allow it to be extended in the future. Two trigger types are defined
to start with. One is a trigger that indicates that the SPI peripheral
is ready to read or write data. The other is a periodic trigger to
repeat a SPI message at a fixed rate.
There is also a spi_offload_hw_trigger_validate() function that works
similar to clk_round_rate(). It basically asks the question of if we
enabled the hardware trigger what would the actual parameters be. This
can be used to test if the requested trigger type is actually supported
by the hardware and for periodic triggers, it can be used to find the
actual rate that the hardware is capable of.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250207-dlech-mainline-spi-engine-offload-2-v8-2-e48a489be48c@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi/offload/consumer.h')
| -rw-r--r-- | include/linux/spi/offload/consumer.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/spi/offload/consumer.h b/include/linux/spi/offload/consumer.h index 05543dbedf30..5a0ec5303d60 100644 --- a/include/linux/spi/offload/consumer.h +++ b/include/linux/spi/offload/consumer.h @@ -19,4 +19,16 @@ struct spi_device; struct spi_offload *devm_spi_offload_get(struct device *dev, struct spi_device *spi, const struct spi_offload_config *config); +struct spi_offload_trigger +*devm_spi_offload_trigger_get(struct device *dev, + struct spi_offload *offload, + enum spi_offload_trigger_type type); +int spi_offload_trigger_validate(struct spi_offload_trigger *trigger, + struct spi_offload_trigger_config *config); +int spi_offload_trigger_enable(struct spi_offload *offload, + struct spi_offload_trigger *trigger, + struct spi_offload_trigger_config *config); +void spi_offload_trigger_disable(struct spi_offload *offload, + struct spi_offload_trigger *trigger); + #endif /* __LINUX_SPI_OFFLOAD_CONSUMER_H */ |