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spi: offload: Add offset parameter 

Merge series from From git@z Thu Jan  1 00:00:00 1970
Axel Haslam <ahaslam@baylibre.com>:

Add an offset parameter that can be passed in the periodic trigger.
This is useful for example when ADC drivers implement a separate periodic
signal to trigger conversion and need offload to read the result with
some delay. While at it, add some documentation to offload periodic trigger
parameters.
This commit is contained in:
Mark Brown 2025-10-15 11:32:47 +01:00
parent 4412ab5016 b83fb1b14c
commit a758314f71
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GPG Key ID: 24D68B725D5487D0
2 changed files with 12 additions and 0 deletions
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3
drivers/spi/spi-offload-trigger-pwm.c
View File

@ -51,12 +51,14 @@ static int spi_offload_trigger_pwm_validate(struct spi_offload_trigger *trigger,
wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz);
/* REVISIT: 50% duty-cycle for now - may add config parameter later */
wf.duty_length_ns = wf.period_length_ns / 2;
wf.duty_offset_ns = periodic->offset_ns;
ret = pwm_round_waveform_might_sleep(st->pwm, &wf);
if (ret < 0)
return ret;
periodic->frequency_hz = DIV_ROUND_UP_ULL(NSEC_PER_SEC, wf.period_length_ns);
periodic->offset_ns = wf.duty_offset_ns;
return 0;
}
@ -77,6 +79,7 @@ static int spi_offload_trigger_pwm_enable(struct spi_offload_trigger *trigger,
wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz);
/* REVISIT: 50% duty-cycle for now - may add config parameter later */
wf.duty_length_ns = wf.period_length_ns / 2;
wf.duty_offset_ns = periodic->offset_ns;
return pwm_set_waveform_might_sleep(st->pwm, &wf, false);
}

9
include/linux/spi/offload/types.h
View File

@ -57,8 +57,17 @@ enum spi_offload_trigger_type {
SPI_OFFLOAD_TRIGGER_PERIODIC,
};
/**
* spi_offload_trigger_periodic - configuration parameters for periodic triggers
* @frequency_hz: The rate that the trigger should fire in Hz.
* @offset_ns: A delay in nanoseconds between when this trigger fires
* compared to another trigger. This requires specialized hardware
* that supports such synchronization with a delay between two or
* more triggers. Set to 0 when not needed.
*/
struct spi_offload_trigger_periodic {
u64 frequency_hz;
u64 offset_ns;
};
struct spi_offload_trigger_config {