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drivers: adc: nrf_saadc: add pm device support

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Extend nrf saadc device driver with pm device runtime support.

To preserve previous behavior:

* if pm device is disabled, saadc is resumed on sampling start
  and suspended when sampling done.
* if pm device is enabled only, saadc does nothing on
  sampling start/stop. its resumed on init.
* if pm device runtime is enabled, saadc is got on
  sampling start, and put on sampling stop.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>
This commit is contained in:
Bjarki Arge Andreasen 2025-02-10 10:40:55 +01:00 • committed by Benjamin Cabé
commit 96c3cd6cd3
1 changed files with 34 additions and 2 deletions
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36
drivers/adc/adc_nrfx_saadc.c
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@ -10,6 +10,8 @@
#include <zephyr/dt-bindings/adc/nrf-saadc-v3.h>
#include <zephyr/dt-bindings/adc/nrf-saadc-nrf54l.h>
#include <zephyr/linker/devicetree_regions.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
#include <zephyr/logging/log.h>
@ -168,6 +170,26 @@ static int adc_convert_acq_time(uint16_t acquisition_time, nrf_saadc_acqtime_t *
return result;
}
static int saadc_pm_hook(const struct device *dev, enum pm_device_action action)
{
ARG_UNUSED(dev);
switch (action) {
case PM_DEVICE_ACTION_SUSPEND:
nrf_saadc_disable(NRF_SAADC);
return 0;
case PM_DEVICE_ACTION_RESUME:
nrf_saadc_enable(NRF_SAADC);
return 0;
default:
break;
}
return -ENOTSUP;
}
/* Implementation of the ADC driver API function: adc_channel_setup. */
static int adc_nrfx_channel_setup(const struct device *dev,
const struct adc_channel_cfg *channel_cfg)
@ -320,7 +342,11 @@ static int adc_nrfx_channel_setup(const struct device *dev,
static void adc_context_start_sampling(struct adc_context *ctx)
{
#if defined(CONFIG_PM_DEVICE_RUNTIME)
pm_device_runtime_get(DEVICE_DT_INST_GET(0));
#else
nrf_saadc_enable(NRF_SAADC);
#endif
if (ctx->sequence.calibrate) {
nrf_saadc_task_trigger(NRF_SAADC,
@ -623,7 +649,12 @@ static void saadc_irq_handler(const struct device *dev)
nrf_saadc_event_clear(NRF_SAADC, NRF_SAADC_EVENT_END);
nrf_saadc_task_trigger(NRF_SAADC, NRF_SAADC_TASK_STOP);
#if defined(CONFIG_PM_DEVICE_RUNTIME)
pm_device_runtime_put(DEVICE_DT_INST_GET(0));
#else
nrf_saadc_disable(NRF_SAADC);
#endif
if (has_single_ended(&m_data.ctx.sequence)) {
correct_single_ended(&m_data.ctx.sequence);
@ -663,7 +694,7 @@ static int init_saadc(const struct device *dev)
adc_context_unlock_unconditionally(&m_data.ctx);
return 0;
return pm_device_driver_init(dev, saadc_pm_hook);
}
static DEVICE_API(adc, adc_nrfx_driver_api) = {
@ -693,9 +724,10 @@ static DEVICE_API(adc, adc_nrfx_driver_api) = {
#define SAADC_INIT(inst) \
BUILD_ASSERT((inst) == 0, \
"multiple instances not supported"); \
PM_DEVICE_DT_INST_DEFINE(0, saadc_pm_hook, 1); \
DEVICE_DT_INST_DEFINE(0, \
init_saadc, \
NULL, \
PM_DEVICE_DT_INST_GET(0), \
NULL, \
NULL, \
POST_KERNEL, \