Commit b01ced2b authored by Fabrice Gasnier's avatar Fabrice Gasnier Committed by Lee Jones

iio: trigger: Add STM32 LPTimer trigger driver

Add support for LPTIMx_OUT triggers that can be found on some STM32
devices. These triggers can be used then by ADC or DAC.
Typical usage is to configure LPTimer as PWM output (via pwm-stm32-lp)
and have synchronised analog conversions with these triggers.
Signed-off-by: default avatarFabrice Gasnier <>
Reviewed-by: default avatarJonathan Cameron <>
Signed-off-by: default avatarLee Jones <>
parent 5dae3c90
......@@ -24,6 +24,17 @@ config IIO_INTERRUPT_TRIGGER
To compile this driver as a module, choose M here: the
module will be called iio-trig-interrupt.
tristate "STM32 Low-Power Timer Trigger"
Select this option to enable STM32 Low-Power Timer Trigger.
This can be used as trigger source for STM32 internal ADC
and/or DAC.
To compile this driver as a module, choose M here: the
module will be called stm32-lptimer-trigger.
tristate "STM32 Timer Trigger"
depends on (ARCH_STM32 && OF && MFD_STM32_TIMERS) || COMPILE_TEST
......@@ -6,6 +6,7 @@
obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
obj-$(CONFIG_IIO_STM32_LPTIMER_TRIGGER) += stm32-lptimer-trigger.o
obj-$(CONFIG_IIO_STM32_TIMER_TRIGGER) += stm32-timer-trigger.o
obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o
obj-$(CONFIG_IIO_TIGHTLOOP_TRIGGER) += iio-trig-loop.o
* STM32 Low-Power Timer Trigger driver
* Copyright (C) STMicroelectronics 2017
* Author: Fabrice Gasnier <>.
* License terms: GNU General Public License (GPL), version 2
* Inspired by Benjamin Gaignard's stm32-timer-trigger driver
#include <linux/iio/timer/stm32-lptim-trigger.h>
#include <linux/mfd/stm32-lptimer.h>
#include <linux/module.h>
#include <linux/platform_device.h>
/* List Low-Power Timer triggers */
static const char * const stm32_lptim_triggers[] = {
struct stm32_lptim_trigger {
struct device *dev;
const char *trg;
static int stm32_lptim_validate_device(struct iio_trigger *trig,
struct iio_dev *indio_dev)
if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
return 0;
return -EINVAL;
static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
.owner = THIS_MODULE,
.validate_device = stm32_lptim_validate_device,
* is_stm32_lptim_trigger
* @trig: trigger to be checked
* return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
* either return false
bool is_stm32_lptim_trigger(struct iio_trigger *trig)
return (trig->ops == &stm32_lptim_trigger_ops);
static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
struct iio_trigger *trig;
trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
if (!trig)
return -ENOMEM;
trig->dev.parent = priv->dev->parent;
trig->ops = &stm32_lptim_trigger_ops;
iio_trigger_set_drvdata(trig, priv);
return devm_iio_trigger_register(priv->dev, trig);
static int stm32_lptim_trigger_probe(struct platform_device *pdev)
struct stm32_lptim_trigger *priv;
u32 index;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
return -EINVAL;
if (index >= ARRAY_SIZE(stm32_lptim_triggers))
return -EINVAL;
priv->dev = &pdev->dev;
priv->trg = stm32_lptim_triggers[index];
ret = stm32_lptim_setup_trig(priv);
if (ret)
return ret;
platform_set_drvdata(pdev, priv);
return 0;
static const struct of_device_id stm32_lptim_trig_of_match[] = {
{ .compatible = "st,stm32-lptimer-trigger", },
MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
static struct platform_driver stm32_lptim_trigger_driver = {
.probe = stm32_lptim_trigger_probe,
.driver = {
.name = "stm32-lptimer-trigger",
.of_match_table = stm32_lptim_trig_of_match,
MODULE_AUTHOR("Fabrice Gasnier <>");
MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
* Copyright (C) STMicroelectronics 2017
* Author: Fabrice Gasnier <>
* License terms: GNU General Public License (GPL), version 2
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#define LPTIM1_OUT "lptim1_out"
#define LPTIM2_OUT "lptim2_out"
#define LPTIM3_OUT "lptim3_out"
bool is_stm32_lptim_trigger(struct iio_trigger *trig);
static inline bool is_stm32_lptim_trigger(struct iio_trigger *trig)
return false;
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