Message-Id: <1481027929-13704-7-git-send-email-benjamin.gaignard@st.com>
Date:   Tue,  6 Dec 2016 13:38:48 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        alexandre.torgue@...com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, thierry.reding@...il.com,
        linux-pwm@...r.kernel.org, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     fabrice.gasnier@...com, gerald.baeza@...com,
        arnaud.pouliquen@...com, linus.walleij@...aro.org,
        linaro-kernel@...ts.linaro.org, benjamin.gaignard@...aro.org,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: [PATCH v4 6/7] IIO: add STM32 timer trigger driver

Timers IPs can be used to generate triggers for other IPs like
DAC, ADC or other timers.
Each trigger may result of timer internals signals like counter enable,
reset or edge, this configuration could be done through "master_mode"
device attribute.

A timer device could be triggered by other timers, we use the trigger
name and is_stm32_iio_timer_trigger() function to distinguish them
and configure IP input switch.

Timer may also decide on which event (edge, level) they could
be activated by a trigger, this configuration is done by writing in
"slave_mode" device attribute.

Since triggers could also be used by DAC or ADC their names are defined
in include/ nux/iio/timer/stm32-timer-trigger.h so those IPs will be able
to configure themselves in valid_trigger function

Trigger have a "sampling_frequency" attribute which allow to configure
timer sampling frequency without using PWM interface

version 4:
- get triggers configuration from "reg" in DT
- add tables of triggers
- sampling frequency is enable/disable when writing in trigger
  sampling_frequency attribute
- no more use of interruptions

version 3:
- change compatible to "st,stm32-timer-trigger"
- fix attributes access right
- use string instead of int for master_mode and slave_mode
- document device attributes in sysfs-bus-iio-timer-stm32

version 2:
- keep only one compatible
- use st,input-triggers-names and st,output-triggers-names
  to know which triggers are accepted and/or create by the device

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
---
 .../ABI/testing/sysfs-bus-iio-timer-stm32          |  55 +++
 drivers/iio/Kconfig                                |   2 +-
 drivers/iio/Makefile                               |   1 +
 drivers/iio/timer/Kconfig                          |  15 +
 drivers/iio/timer/Makefile                         |   1 +
 drivers/iio/timer/stm32-timer-trigger.c            | 526 +++++++++++++++++++++
 drivers/iio/trigger/Kconfig                        |   1 -
 include/linux/iio/timer/stm32-timer-trigger.h      |  61 +++
 8 files changed, 660 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
 create mode 100644 drivers/iio/timer/Kconfig
 create mode 100644 drivers/iio/timer/Makefile
 create mode 100644 drivers/iio/timer/stm32-timer-trigger.c
 create mode 100644 include/linux/iio/timer/stm32-timer-trigger.h

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
new file mode 100644
index 0000000..26583dd
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
@@ -0,0 +1,55 @@
+What:		/sys/bus/iio/devices/iio:deviceX/master_mode_available
+KernelVersion:	4.10
+Contact:	benjamin.gaignard@...com
+Description:
+		Reading returns the list possible master modes which are:
+		- "reset"     :	The UG bit from the TIMx_EGR register is used as trigger output (TRGO).
+		- "enable"    : The Counter Enable signal CNT_EN is used as trigger output.
+		- "update"    : The update event is selected as trigger output.
+				For instance a master timer can then be used as a prescaler for a slave timer.
+		- "compare_pulse" : The trigger output send a positive pulse when the CC1IF flag is to be set.
+		- "OC1REF"    : OC1REF signal is used as trigger output.
+		- "OC2REF"    : OC2REF signal is used as trigger output.
+		- "OC3REF"    : OC3REF signal is used as trigger output.
+		- "OC4REF"    : OC4REF signal is used as trigger output.
+
+What:		/sys/bus/iio/devices/iio:deviceX/master_mode
+KernelVersion:	4.10
+Contact:	benjamin.gaignard@...com
+Description:
+		Reading returns the current master modes.
+		Writing set the master mode
+
+What:		/sys/bus/iio/devices/iio:deviceX/slave_mode_available
+KernelVersion:	4.10
+Contact:	benjamin.gaignard@...com
+Description:
+		Reading returns the list possible slave modes which are:
+		- "disabled"  : The prescaler is clocked directly by the internal clock.
+		- "encoder_1" : Counter counts up/down on TI2FP1 edge depending on TI1FP2 level.
+		- "encoder_2" : Counter counts up/down on TI1FP2 edge depending on TI2FP1 level.
+		- "encoder_3" : Counter counts up/down on both TI1FP1 and TI2FP2 edges depending
+				on the level of the other input.
+		- "reset"     : Rising edge of the selected trigger input reinitializes the counter
+				and generates an update of the registers.
+		- "gated"     : The counter clock is enabled when the trigger input is high.
+				The counter stops (but is not reset) as soon as the trigger becomes low.
+				Both start and stop of the counter are controlled.
+		- "trigger"   : The counter starts at a rising edge of the trigger TRGI (but it is not
+				reset). Only the start of the counter is controlled.
+		- "external_clock": Rising edges of the selected trigger (TRGI) clock the counter.
+
+What:		/sys/bus/iio/devices/iio:deviceX/slave_mode
+KernelVersion:	4.10
+Contact:	benjamin.gaignard@...com
+Description:
+		Reading returns the current slave mode.
+		Writing set the slave mode
+
+What:		/sys/bus/iio/devices/triggerX/sampling_frequency
+KernelVersion:	4.10
+Contact:	benjamin.gaignard@...com
+Description:
+		Reading returns the current sampling frequency.
+		Writing an value different of 0 set and start sampling.
+		Writing 0 stop sampling.
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 6743b18..2de2a80 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -90,5 +90,5 @@ source "drivers/iio/potentiometer/Kconfig"
 source "drivers/iio/pressure/Kconfig"
 source "drivers/iio/proximity/Kconfig"
 source "drivers/iio/temperature/Kconfig"
-
+source "drivers/iio/timer/Kconfig"
 endif # IIO
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index 87e4c43..b797c08 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -32,4 +32,5 @@ obj-y += potentiometer/
 obj-y += pressure/
 obj-y += proximity/
 obj-y += temperature/
+obj-y += timer/
 obj-y += trigger/
diff --git a/drivers/iio/timer/Kconfig b/drivers/iio/timer/Kconfig
new file mode 100644
index 0000000..3033869
--- /dev/null
+++ b/drivers/iio/timer/Kconfig
@@ -0,0 +1,15 @@
+#
+# Timers drivers
+
+menu "Timers"
+
+config IIO_STM32_TIMER_TRIGGER
+	tristate "STM32 Timer Trigger"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on OF
+	depends on MFD_STM32_GP_TIMER
+	select IIO_TRIGGERED_EVENT
+	help
+	  Select this option to enable STM32 Timer Trigger
+
+endmenu
diff --git a/drivers/iio/timer/Makefile b/drivers/iio/timer/Makefile
new file mode 100644
index 0000000..4ad95ec9
--- /dev/null
+++ b/drivers/iio/timer/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_IIO_STM32_TIMER_TRIGGER) += stm32-timer-trigger.o
diff --git a/drivers/iio/timer/stm32-timer-trigger.c b/drivers/iio/timer/stm32-timer-trigger.c
new file mode 100644
index 0000000..58fba33
--- /dev/null
+++ b/drivers/iio/timer/stm32-timer-trigger.c
@@ -0,0 +1,526 @@
+/*
+ * Copyright (C) STMicroelectronics 2016
+ *
+ * Author: Benjamin Gaignard <benjamin.gaignard@...com>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/timer/stm32-timer-trigger.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_event.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/stm32-gptimer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static const char * const triggers0[] = {
+	TIM1_TRGO, TIM1_CH1, TIM1_CH2, TIM1_CH3, TIM1_CH4, NULL,
+};
+
+static const char * const triggers1[] = {
+	TIM2_TRGO, TIM2_CH1, TIM2_CH2, TIM2_CH3, TIM2_CH4, NULL,
+};
+
+static const char * const triggers2[] = {
+	TIM3_TRGO, TIM3_CH1, TIM3_CH2, TIM3_CH3, TIM3_CH4, NULL,
+};
+
+static const char * const triggers3[] = {
+	TIM4_TRGO, TIM4_CH1, TIM4_CH2, TIM4_CH3, TIM4_CH4, NULL,
+};
+
+static const char * const triggers4[] = {
+	TIM5_TRGO, TIM5_CH1, TIM5_CH2, TIM5_CH3, TIM5_CH4, NULL,
+};
+
+static const char * const triggers5[] = {
+	TIM6_TRGO, NULL,
+};
+
+static const char * const triggers6[] = {
+	TIM7_TRGO, NULL,
+};
+
+static const char * const triggers7[] = {
+	TIM8_TRGO, TIM8_CH1, TIM8_CH2, TIM8_CH3, TIM8_CH4, NULL,
+};
+
+static const char * const triggers8[] = {
+	TIM9_TRGO, TIM9_CH1, TIM9_CH2, NULL,
+};
+
+static const char * const triggers9[] = {
+	TIM12_TRGO, TIM12_CH1, TIM12_CH2, NULL,
+};
+
+static const void *triggers_table[] = {
+	triggers0,
+	triggers1,
+	triggers2,
+	triggers3,
+	triggers4,
+	triggers5,
+	triggers6,
+	triggers7,
+	triggers8,
+	triggers9,
+};
+
+static const char * const valids0[] = {
+	TIM5_TRGO, TIM2_TRGO, TIM4_TRGO, TIM3_TRGO, NULL,
+};
+
+static const char * const valids1[] = {
+	TIM1_TRGO, TIM8_TRGO, TIM3_TRGO, TIM4_TRGO, NULL,
+};
+
+static const char * const valids2[] = {
+	TIM1_TRGO, TIM8_TRGO, TIM5_TRGO, TIM4_TRGO, NULL,
+};
+
+static const char * const valids3[] = {
+	TIM1_TRGO, TIM2_TRGO, TIM3_TRGO, TIM8_TRGO, NULL,
+};
+
+static const char *const valids4[] = {
+	TIM2_TRGO, TIM3_TRGO, TIM4_TRGO, TIM8_TRGO, NULL,
+};
+
+static const char * const valids7[] = {
+	TIM1_TRGO, TIM2_TRGO, TIM4_TRGO, TIM5_TRGO, NULL,
+};
+
+static const char * const valids8[] = {
+	TIM2_TRGO, TIM3_TRGO, NULL,
+};
+
+static const char * const valids9[] = {
+	TIM4_TRGO, TIM5_TRGO, NULL,
+};
+
+static const void *valids_table[] = {
+	valids0,
+	valids1,
+	valids2,
+	valids3,
+	valids4,
+	NULL,
+	NULL,
+	valids7,
+	valids8,
+	valids9,
+};
+
+struct stm32_timer_trigger {
+	struct device *dev;
+	struct regmap *regmap;
+	struct clk *clk;
+	u32 max_arr;
+	const void *triggers;
+	const void *valids;
+};
+
+static int stm32_timer_start(struct stm32_timer_trigger *priv,
+			     unsigned int frequency)
+{
+	unsigned long long prd, div;
+	int prescaler = 0;
+	u32 ccer, cr1;
+
+	/* Period and prescaler values depends of clock rate */
+	div = (unsigned long long)clk_get_rate(priv->clk);
+
+	do_div(div, frequency);
+
+	prd = div;
+
+	/*
+	 * Increase prescaler value until we get a result that fit
+	 * with auto reload register maximum value.
+	 */
+	while (div > priv->max_arr) {
+		prescaler++;
+		div = prd;
+		do_div(div, (prescaler + 1));
+	}
+	prd = div;
+
+	if (prescaler > MAX_TIM_PSC) {
+		dev_err(priv->dev, "prescaler exceeds the maximum value\n");
+		return -EINVAL;
+	}
+
+	/* Check if nobody else use the timer */
+	regmap_read(priv->regmap, TIM_CCER, &ccer);
+	if (ccer & TIM_CCER_CCXE)
+		return -EBUSY;
+
+	regmap_read(priv->regmap, TIM_CR1, &cr1);
+	if (!(cr1 & TIM_CR1_CEN))
+		clk_enable(priv->clk);
+
+	regmap_write(priv->regmap, TIM_PSC, prescaler);
+	regmap_write(priv->regmap, TIM_ARR, prd - 1);
+	regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, TIM_CR1_ARPE);
+
+	/* Force master mode to update mode */
+	regmap_update_bits(priv->regmap, TIM_CR2, TIM_CR2_MMS, 0x20);
+
+	/* Make sure that registers are updated */
+	regmap_update_bits(priv->regmap, TIM_EGR, TIM_EGR_UG, TIM_EGR_UG);
+
+	/* Enable controller */
+	regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN, TIM_CR1_CEN);
+
+	return 0;
+}
+
+static void stm32_timer_stop(struct stm32_timer_trigger *priv)
+{
+	u32 ccer, cr1;
+
+	regmap_read(priv->regmap, TIM_CCER, &ccer);
+	if (ccer & TIM_CCER_CCXE)
+		return;
+
+	regmap_read(priv->regmap, TIM_CR1, &cr1);
+	if (cr1 & TIM_CR1_CEN)
+		clk_disable(priv->clk);
+
+	/* Stop timer */
+	regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN, 0);
+	regmap_write(priv->regmap, TIM_PSC, 0);
+	regmap_write(priv->regmap, TIM_ARR, 0);
+}
+
+static ssize_t stm32_tt_store_frequency(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	struct iio_trigger *trig = to_iio_trigger(dev);
+	struct stm32_timer_trigger *priv = iio_trigger_get_drvdata(trig);
+	unsigned int freq;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &freq);
+	if (ret)
+		return ret;
+
+	if (freq == 0) {
+		stm32_timer_stop(priv);
+	} else {
+		ret = stm32_timer_start(priv, freq);
+		if (ret)
+			return ret;
+	}
+
+	return len;
+}
+
+static ssize_t stm32_tt_read_frequency(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct iio_trigger *trig = to_iio_trigger(dev);
+	struct stm32_timer_trigger *priv = iio_trigger_get_drvdata(trig);
+	u32 psc, arr, cr1;
+	unsigned long long freq = 0;
+
+	regmap_read(priv->regmap, TIM_CR1, &cr1);
+	regmap_read(priv->regmap, TIM_PSC, &psc);
+	regmap_read(priv->regmap, TIM_ARR, &arr);
+
+	if (psc && arr && (cr1 & TIM_CR1_CEN)) {
+		freq = (unsigned long long)clk_get_rate(priv->clk);
+		do_div(freq, psc);
+		do_div(freq, arr);
+	}
+
+	return sprintf(buf, "%d\n", (unsigned int)freq);
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ(0660,
+			      stm32_tt_read_frequency,
+			      stm32_tt_store_frequency);
+
+static struct attribute *stm32_trigger_attrs[] = {
+	&iio_dev_attr_sampling_frequency.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group stm32_trigger_attr_group = {
+	.attrs = stm32_trigger_attrs,
+};
+
+static const struct attribute_group *stm32_trigger_attr_groups[] = {
+	&stm32_trigger_attr_group,
+	NULL,
+};
+
+static char *master_mode_table[] = {
+	"reset",
+	"enable",
+	"update",
+	"compare_pulse",
+	"OC1REF",
+	"OC2REF",
+	"OC3REF",
+	"OC4REF"
+};
+
+static ssize_t stm32_tt_show_master_mode(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+	u32 cr2;
+
+	regmap_read(priv->regmap, TIM_CR2, &cr2);
+	cr2 = (cr2 & TIM_CR2_MMS) >> TIM_CR2_MMS_SHIFT;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", master_mode_table[cr2]);
+}
+
+static ssize_t stm32_tt_store_master_mode(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(master_mode_table); i++) {
+		if (!strncmp(master_mode_table[i], buf,
+			     strlen(master_mode_table[i]))) {
+			regmap_update_bits(priv->regmap, TIM_CR2,
+					   TIM_CR2_MMS, i << TIM_CR2_MMS_SHIFT);
+			return len;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static IIO_CONST_ATTR(master_mode_available,
+	"reset enable update compare_pulse OC1REF OC2REF OC3REF OC4REF");
+
+static IIO_DEVICE_ATTR(master_mode, 0660,
+		       stm32_tt_show_master_mode,
+		       stm32_tt_store_master_mode,
+		       0);
+
+static char *slave_mode_table[] = {
+	"disabled",
+	"encoder_1",
+	"encoder_2",
+	"encoder_3",
+	"reset",
+	"gated",
+	"trigger",
+	"external_clock",
+};
+
+static ssize_t stm32_tt_show_slave_mode(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+	u32 smcr;
+
+	regmap_read(priv->regmap, TIM_SMCR, &smcr);
+	smcr &= TIM_SMCR_SMS;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", slave_mode_table[smcr]);
+}
+
+static ssize_t stm32_tt_store_slave_mode(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf, size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(slave_mode_table); i++) {
+		if (!strncmp(slave_mode_table[i], buf,
+			     strlen(slave_mode_table[i]))) {
+			regmap_update_bits(priv->regmap,
+					   TIM_SMCR, TIM_SMCR_SMS, i);
+			return len;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static IIO_CONST_ATTR(slave_mode_available,
+"disabled encoder_1 encoder_2 encoder_3 reset gated trigger external_clock");
+
+static IIO_DEVICE_ATTR(slave_mode, 0660,
+		       stm32_tt_show_slave_mode,
+		       stm32_tt_store_slave_mode,
+		       0);
+
+static struct attribute *stm32_timer_attrs[] = {
+	&iio_dev_attr_master_mode.dev_attr.attr,
+	&iio_const_attr_master_mode_available.dev_attr.attr,
+	&iio_dev_attr_slave_mode.dev_attr.attr,
+	&iio_const_attr_slave_mode_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group stm32_timer_attr_group = {
+	.attrs = stm32_timer_attrs,
+};
+
+static const struct iio_trigger_ops timer_trigger_ops = {
+	.owner = THIS_MODULE,
+};
+
+static int stm32_setup_iio_triggers(struct stm32_timer_trigger *priv)
+{
+	int ret;
+	const char * const *cur = priv->triggers;
+
+	while (cur && *cur) {
+		struct iio_trigger *trig;
+
+		trig = devm_iio_trigger_alloc(priv->dev, "%s", *cur);
+		if  (!trig)
+			return -ENOMEM;
+
+		trig->dev.parent = priv->dev->parent;
+		trig->ops = &timer_trigger_ops;
+		trig->dev.groups = stm32_trigger_attr_groups;
+		iio_trigger_set_drvdata(trig, priv);
+
+		ret = devm_iio_trigger_register(priv->dev, trig);
+		if (ret)
+			return ret;
+		cur++;
+	}
+
+	return 0;
+}
+
+/**
+ * is_stm32_timer_trigger
+ * @trig: trigger to be checked
+ *
+ * return true if the trigger is a valid stm32 iio timer trigger
+ * either return false
+ */
+bool is_stm32_timer_trigger(struct iio_trigger *trig)
+{
+	return (trig->ops == &timer_trigger_ops);
+}
+EXPORT_SYMBOL(is_stm32_timer_trigger);
+
+static int stm32_validate_trigger(struct iio_dev *indio_dev,
+				  struct iio_trigger *trig)
+{
+	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+	const char * const *cur = priv->valids;
+	unsigned int i = 0;
+
+	if (!is_stm32_timer_trigger(trig))
+		return -EINVAL;
+
+	while (cur && *cur) {
+		if (!strncmp(trig->name, *cur, strlen(trig->name))) {
+			regmap_update_bits(priv->regmap,
+					   TIM_SMCR, TIM_SMCR_TS,
+					   i << TIM_SMCR_TS_SHIFT);
+			return 0;
+		}
+		cur++;
+		i++;
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info stm32_trigger_info = {
+	.driver_module = THIS_MODULE,
+	.validate_trigger = stm32_validate_trigger,
+	.attrs = &stm32_timer_attr_group,
+};
+
+static struct stm32_timer_trigger *stm32_setup_iio_device(struct device *dev)
+{
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev,
+					  sizeof(struct stm32_timer_trigger));
+	if (!indio_dev)
+		return NULL;
+
+	indio_dev->name = dev_name(dev);
+	indio_dev->dev.parent = dev;
+	indio_dev->info = &stm32_trigger_info;
+	indio_dev->modes = INDIO_EVENT_TRIGGERED;
+	indio_dev->num_channels = 0;
+	indio_dev->dev.of_node = dev->of_node;
+
+	ret = devm_iio_device_register(dev, indio_dev);
+	if (ret)
+		return NULL;
+
+	return iio_priv(indio_dev);
+}
+
+static int stm32_timer_trigger_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct stm32_timer_trigger *priv;
+	struct stm32_gptimer *ddata = dev_get_drvdata(pdev->dev.parent);
+	unsigned int index;
+	int ret;
+
+	if (of_property_read_u32(dev->of_node, "reg", &index))
+		return -EINVAL;
+
+	if (index >= ARRAY_SIZE(triggers_table))
+		return -EINVAL;
+
+	priv = stm32_setup_iio_device(dev);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->regmap = ddata->regmap;
+	priv->clk = ddata->clk;
+	priv->max_arr = ddata->max_arr;
+	priv->triggers = triggers_table[index];
+	priv->valids = valids_table[index];
+
+	ret = stm32_setup_iio_triggers(priv);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static const struct of_device_id stm32_trig_of_match[] = {
+	{ .compatible = "st,stm32-timer-trigger" }
+};
+MODULE_DEVICE_TABLE(of, stm32_trig_of_match);
+
+static struct platform_driver stm32_timer_trigger_driver = {
+	.probe = stm32_timer_trigger_probe,
+	.driver = {
+		.name = "stm32-timer-trigger",
+		.of_match_table = stm32_trig_of_match,
+	},
+};
+module_platform_driver(stm32_timer_trigger_driver);
+
+MODULE_ALIAS("platform: stm32-timer-trigger");
+MODULE_DESCRIPTION("STMicroelectronics STM32 Timer Trigger driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig
index 809b2e7..f2af4fe 100644
--- a/drivers/iio/trigger/Kconfig
+++ b/drivers/iio/trigger/Kconfig
@@ -46,5 +46,4 @@ config IIO_SYSFS_TRIGGER
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called iio-trig-sysfs.
-
 endmenu
diff --git a/include/linux/iio/timer/stm32-timer-trigger.h b/include/linux/iio/timer/stm32-timer-trigger.h
new file mode 100644
index 0000000..06bbaea
--- /dev/null
+++ b/include/linux/iio/timer/stm32-timer-trigger.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) STMicroelectronics 2016
+ *
+ * Author: Benjamin Gaignard <benjamin.gaignard@...com>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _STM32_TIMER_TRIGGER_H_
+#define _STM32_TIMER_TRIGGER_H_
+
+#define TIM1_TRGO	"tim1_trgo"
+#define TIM1_CH1	"tim1_ch1"
+#define TIM1_CH2	"tim1_ch2"
+#define TIM1_CH3	"tim1_ch3"
+#define TIM1_CH4	"tim1_ch4"
+
+#define TIM2_TRGO	"tim2_trgo"
+#define TIM2_CH1	"tim2_ch1"
+#define TIM2_CH2	"tim2_ch2"
+#define TIM2_CH3	"tim2_ch3"
+#define TIM2_CH4	"tim2_ch4"
+
+#define TIM3_TRGO	"tim3_trgo"
+#define TIM3_CH1	"tim3_ch1"
+#define TIM3_CH2	"tim3_ch2"
+#define TIM3_CH3	"tim3_ch3"
+#define TIM3_CH4	"tim3_ch4"
+
+#define TIM4_TRGO	"tim4_trgo"
+#define TIM4_CH1	"tim4_ch1"
+#define TIM4_CH2	"tim4_ch2"
+#define TIM4_CH3	"tim4_ch3"
+#define TIM4_CH4	"tim4_ch4"
+
+#define TIM5_TRGO	"tim5_trgo"
+#define TIM5_CH1	"tim5_ch1"
+#define TIM5_CH2	"tim5_ch2"
+#define TIM5_CH3	"tim5_ch3"
+#define TIM5_CH4	"tim5_ch4"
+
+#define TIM6_TRGO	"tim6_trgo"
+
+#define TIM7_TRGO	"tim7_trgo"
+
+#define TIM8_TRGO	"tim8_trgo"
+#define TIM8_CH1	"tim8_ch1"
+#define TIM8_CH2	"tim8_ch2"
+#define TIM8_CH3	"tim8_ch3"
+#define TIM8_CH4	"tim8_ch4"
+
+#define TIM9_TRGO	"tim9_trgo"
+#define TIM9_CH1	"tim9_ch1"
+#define TIM9_CH2	"tim9_ch2"
+
+#define TIM12_TRGO	"tim12_trgo"
+#define TIM12_CH1	"tim12_ch1"
+#define TIM12_CH2	"tim12_ch2"
+
+bool is_stm32_timer_trigger(struct iio_trigger *trig);
+
+#endif
-- 
1.9.1

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