Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 917 insertions, 0 deletions

diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
new file mode 100644
index 000000000..aa452acb6
--- /dev/null
+++ b/drivers/thermal/imx_thermal.c
@@ -0,0 +1,917 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright 2013 Freescale Semiconductor, Inc.
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/cpu_cooling.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+#include <linux/types.h>
+#include <linux/nvmem-consumer.h>
+
+#define REG_SET		0x4
+#define REG_CLR		0x8
+#define REG_TOG		0xc
+
+/* i.MX6 specific */
+#define IMX6_MISC0				0x0150
+#define IMX6_MISC0_REFTOP_SELBIASOFF		(1 << 3)
+#define IMX6_MISC1				0x0160
+#define IMX6_MISC1_IRQ_TEMPHIGH			(1 << 29)
+/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
+#define IMX6_MISC1_IRQ_TEMPLOW			(1 << 28)
+#define IMX6_MISC1_IRQ_TEMPPANIC		(1 << 27)
+
+#define IMX6_TEMPSENSE0				0x0180
+#define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT	20
+#define IMX6_TEMPSENSE0_ALARM_VALUE_MASK	(0xfff << 20)
+#define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT		8
+#define IMX6_TEMPSENSE0_TEMP_CNT_MASK		(0xfff << 8)
+#define IMX6_TEMPSENSE0_FINISHED		(1 << 2)
+#define IMX6_TEMPSENSE0_MEASURE_TEMP		(1 << 1)
+#define IMX6_TEMPSENSE0_POWER_DOWN		(1 << 0)
+
+#define IMX6_TEMPSENSE1				0x0190
+#define IMX6_TEMPSENSE1_MEASURE_FREQ		0xffff
+#define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT	0
+
+#define OCOTP_MEM0			0x0480
+#define OCOTP_ANA1			0x04e0
+
+/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
+#define IMX6_TEMPSENSE2				0x0290
+#define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT		0
+#define IMX6_TEMPSENSE2_LOW_VALUE_MASK		0xfff
+#define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT	16
+#define IMX6_TEMPSENSE2_PANIC_VALUE_MASK	0xfff0000
+
+/* i.MX7 specific */
+#define IMX7_ANADIG_DIGPROG			0x800
+#define IMX7_TEMPSENSE0				0x300
+#define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT	18
+#define IMX7_TEMPSENSE0_PANIC_ALARM_MASK	(0x1ff << 18)
+#define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT	9
+#define IMX7_TEMPSENSE0_HIGH_ALARM_MASK		(0x1ff << 9)
+#define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT		0
+#define IMX7_TEMPSENSE0_LOW_ALARM_MASK		0x1ff
+
+#define IMX7_TEMPSENSE1				0x310
+#define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT	16
+#define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK	(0xffff << 16)
+#define IMX7_TEMPSENSE1_FINISHED		(1 << 11)
+#define IMX7_TEMPSENSE1_MEASURE_TEMP		(1 << 10)
+#define IMX7_TEMPSENSE1_POWER_DOWN		(1 << 9)
+#define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT	0
+#define IMX7_TEMPSENSE1_TEMP_VALUE_MASK		0x1ff
+
+/* The driver supports 1 passive trip point and 1 critical trip point */
+enum imx_thermal_trip {
+	IMX_TRIP_PASSIVE,
+	IMX_TRIP_CRITICAL,
+	IMX_TRIP_NUM,
+};
+
+#define IMX_POLLING_DELAY		2000 /* millisecond */
+#define IMX_PASSIVE_DELAY		1000
+
+#define TEMPMON_IMX6Q			1
+#define TEMPMON_IMX6SX			2
+#define TEMPMON_IMX7D			3
+
+struct thermal_soc_data {
+	u32 version;
+
+	u32 sensor_ctrl;
+	u32 power_down_mask;
+	u32 measure_temp_mask;
+
+	u32 measure_freq_ctrl;
+	u32 measure_freq_mask;
+	u32 measure_freq_shift;
+
+	u32 temp_data;
+	u32 temp_value_mask;
+	u32 temp_value_shift;
+	u32 temp_valid_mask;
+
+	u32 panic_alarm_ctrl;
+	u32 panic_alarm_mask;
+	u32 panic_alarm_shift;
+
+	u32 high_alarm_ctrl;
+	u32 high_alarm_mask;
+	u32 high_alarm_shift;
+
+	u32 low_alarm_ctrl;
+	u32 low_alarm_mask;
+	u32 low_alarm_shift;
+};
+
+static struct thermal_soc_data thermal_imx6q_data = {
+	.version = TEMPMON_IMX6Q,
+
+	.sensor_ctrl = IMX6_TEMPSENSE0,
+	.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
+	.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
+
+	.measure_freq_ctrl = IMX6_TEMPSENSE1,
+	.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
+	.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
+
+	.temp_data = IMX6_TEMPSENSE0,
+	.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
+	.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
+	.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
+
+	.high_alarm_ctrl = IMX6_TEMPSENSE0,
+	.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
+	.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
+};
+
+static struct thermal_soc_data thermal_imx6sx_data = {
+	.version = TEMPMON_IMX6SX,
+
+	.sensor_ctrl = IMX6_TEMPSENSE0,
+	.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
+	.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
+
+	.measure_freq_ctrl = IMX6_TEMPSENSE1,
+	.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
+	.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
+
+	.temp_data = IMX6_TEMPSENSE0,
+	.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
+	.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
+	.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
+
+	.high_alarm_ctrl = IMX6_TEMPSENSE0,
+	.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
+	.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
+
+	.panic_alarm_ctrl = IMX6_TEMPSENSE2,
+	.panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
+	.panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
+
+	.low_alarm_ctrl = IMX6_TEMPSENSE2,
+	.low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
+	.low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
+};
+
+static struct thermal_soc_data thermal_imx7d_data = {
+	.version = TEMPMON_IMX7D,
+
+	.sensor_ctrl = IMX7_TEMPSENSE1,
+	.power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
+	.measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
+
+	.measure_freq_ctrl = IMX7_TEMPSENSE1,
+	.measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
+	.measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
+
+	.temp_data = IMX7_TEMPSENSE1,
+	.temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
+	.temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
+	.temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
+
+	.panic_alarm_ctrl = IMX7_TEMPSENSE1,
+	.panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
+	.panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
+
+	.high_alarm_ctrl = IMX7_TEMPSENSE0,
+	.high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
+	.high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
+
+	.low_alarm_ctrl = IMX7_TEMPSENSE0,
+	.low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
+	.low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
+};
+
+struct imx_thermal_data {
+	struct cpufreq_policy *policy;
+	struct thermal_zone_device *tz;
+	struct thermal_cooling_device *cdev;
+	enum thermal_device_mode mode;
+	struct regmap *tempmon;
+	u32 c1, c2; /* See formula in imx_init_calib() */
+	int temp_passive;
+	int temp_critical;
+	int temp_max;
+	int alarm_temp;
+	int last_temp;
+	bool irq_enabled;
+	int irq;
+	struct clk *thermal_clk;
+	const struct thermal_soc_data *socdata;
+	const char *temp_grade;
+};
+
+static void imx_set_panic_temp(struct imx_thermal_data *data,
+			       int panic_temp)
+{
+	const struct thermal_soc_data *soc_data = data->socdata;
+	struct regmap *map = data->tempmon;
+	int critical_value;
+
+	critical_value = (data->c2 - panic_temp) / data->c1;
+
+	regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
+		     soc_data->panic_alarm_mask);
+	regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
+		     critical_value << soc_data->panic_alarm_shift);
+}
+
+static void imx_set_alarm_temp(struct imx_thermal_data *data,
+			       int alarm_temp)
+{
+	struct regmap *map = data->tempmon;
+	const struct thermal_soc_data *soc_data = data->socdata;
+	int alarm_value;
+
+	data->alarm_temp = alarm_temp;
+
+	if (data->socdata->version == TEMPMON_IMX7D)
+		alarm_value = alarm_temp / 1000 + data->c1 - 25;
+	else
+		alarm_value = (data->c2 - alarm_temp) / data->c1;
+
+	regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
+		     soc_data->high_alarm_mask);
+	regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
+		     alarm_value << soc_data->high_alarm_shift);
+}
+
+static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+	struct imx_thermal_data *data = tz->devdata;
+	const struct thermal_soc_data *soc_data = data->socdata;
+	struct regmap *map = data->tempmon;
+	unsigned int n_meas;
+	bool wait;
+	u32 val;
+
+	if (data->mode == THERMAL_DEVICE_ENABLED) {
+		/* Check if a measurement is currently in progress */
+		regmap_read(map, soc_data->temp_data, &val);
+		wait = !(val & soc_data->temp_valid_mask);
+	} else {
+		/*
+		 * Every time we measure the temperature, we will power on the
+		 * temperature sensor, enable measurements, take a reading,
+		 * disable measurements, power off the temperature sensor.
+		 */
+		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
+			    soc_data->power_down_mask);
+		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
+			    soc_data->measure_temp_mask);
+
+		wait = true;
+	}
+
+	/*
+	 * According to the temp sensor designers, it may require up to ~17us
+	 * to complete a measurement.
+	 */
+	if (wait)
+		usleep_range(20, 50);
+
+	regmap_read(map, soc_data->temp_data, &val);
+
+	if (data->mode != THERMAL_DEVICE_ENABLED) {
+		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
+			     soc_data->measure_temp_mask);
+		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
+			     soc_data->power_down_mask);
+	}
+
+	if ((val & soc_data->temp_valid_mask) == 0) {
+		dev_dbg(&tz->device, "temp measurement never finished\n");
+		return -EAGAIN;
+	}
+
+	n_meas = (val & soc_data->temp_value_mask)
+		>> soc_data->temp_value_shift;
+
+	/* See imx_init_calib() for formula derivation */
+	if (data->socdata->version == TEMPMON_IMX7D)
+		*temp = (n_meas - data->c1 + 25) * 1000;
+	else
+		*temp = data->c2 - n_meas * data->c1;
+
+	/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
+	if (data->socdata->version == TEMPMON_IMX6Q) {
+		if (data->alarm_temp == data->temp_passive &&
+			*temp >= data->temp_passive)
+			imx_set_alarm_temp(data, data->temp_critical);
+		if (data->alarm_temp == data->temp_critical &&
+			*temp < data->temp_passive) {
+			imx_set_alarm_temp(data, data->temp_passive);
+			dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
+				data->alarm_temp / 1000);
+		}
+	}
+
+	if (*temp != data->last_temp) {
+		dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
+		data->last_temp = *temp;
+	}
+
+	/* Reenable alarm IRQ if temperature below alarm temperature */
+	if (!data->irq_enabled && *temp < data->alarm_temp) {
+		data->irq_enabled = true;
+		enable_irq(data->irq);
+	}
+
+	return 0;
+}
+
+static int imx_get_mode(struct thermal_zone_device *tz,
+			enum thermal_device_mode *mode)
+{
+	struct imx_thermal_data *data = tz->devdata;
+
+	*mode = data->mode;
+
+	return 0;
+}
+
+static int imx_set_mode(struct thermal_zone_device *tz,
+			enum thermal_device_mode mode)
+{
+	struct imx_thermal_data *data = tz->devdata;
+	struct regmap *map = data->tempmon;
+	const struct thermal_soc_data *soc_data = data->socdata;
+
+	if (mode == THERMAL_DEVICE_ENABLED) {
+		tz->polling_delay = IMX_POLLING_DELAY;
+		tz->passive_delay = IMX_PASSIVE_DELAY;
+
+		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
+			     soc_data->power_down_mask);
+		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
+			     soc_data->measure_temp_mask);
+
+		if (!data->irq_enabled) {
+			data->irq_enabled = true;
+			enable_irq(data->irq);
+		}
+	} else {
+		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
+			     soc_data->measure_temp_mask);
+		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
+			     soc_data->power_down_mask);
+
+		tz->polling_delay = 0;
+		tz->passive_delay = 0;
+
+		if (data->irq_enabled) {
+			disable_irq(data->irq);
+			data->irq_enabled = false;
+		}
+	}
+
+	data->mode = mode;
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
+
+	return 0;
+}
+
+static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
+			     enum thermal_trip_type *type)
+{
+	*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
+					     THERMAL_TRIP_CRITICAL;
+	return 0;
+}
+
+static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
+{
+	struct imx_thermal_data *data = tz->devdata;
+
+	*temp = data->temp_critical;
+	return 0;
+}
+
+static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
+			     int *temp)
+{
+	struct imx_thermal_data *data = tz->devdata;
+
+	*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
+					     data->temp_critical;
+	return 0;
+}
+
+static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
+			     int temp)
+{
+	struct imx_thermal_data *data = tz->devdata;
+
+	/* do not allow changing critical threshold */
+	if (trip == IMX_TRIP_CRITICAL)
+		return -EPERM;
+
+	/* do not allow passive to be set higher than critical */
+	if (temp < 0 || temp > data->temp_critical)
+		return -EINVAL;
+
+	data->temp_passive = temp;
+
+	imx_set_alarm_temp(data, temp);
+
+	return 0;
+}
+
+static int imx_bind(struct thermal_zone_device *tz,
+		    struct thermal_cooling_device *cdev)
+{
+	int ret;
+
+	ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
+					       THERMAL_NO_LIMIT,
+					       THERMAL_NO_LIMIT,
+					       THERMAL_WEIGHT_DEFAULT);
+	if (ret) {
+		dev_err(&tz->device,
+			"binding zone %s with cdev %s failed:%d\n",
+			tz->type, cdev->type, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int imx_unbind(struct thermal_zone_device *tz,
+		      struct thermal_cooling_device *cdev)
+{
+	int ret;
+
+	ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
+	if (ret) {
+		dev_err(&tz->device,
+			"unbinding zone %s with cdev %s failed:%d\n",
+			tz->type, cdev->type, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct thermal_zone_device_ops imx_tz_ops = {
+	.bind = imx_bind,
+	.unbind = imx_unbind,
+	.get_temp = imx_get_temp,
+	.get_mode = imx_get_mode,
+	.set_mode = imx_set_mode,
+	.get_trip_type = imx_get_trip_type,
+	.get_trip_temp = imx_get_trip_temp,
+	.get_crit_temp = imx_get_crit_temp,
+	.set_trip_temp = imx_set_trip_temp,
+};
+
+static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
+{
+	struct imx_thermal_data *data = platform_get_drvdata(pdev);
+	int n1;
+	u64 temp64;
+
+	if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
+		dev_err(&pdev->dev, "invalid sensor calibration data\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * On i.MX7D, we only use the calibration data at 25C to get the temp,
+	 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
+	 */
+	if (data->socdata->version == TEMPMON_IMX7D) {
+		data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
+		return 0;
+	}
+
+	/*
+	 * The sensor is calibrated at 25 °C (aka T1) and the value measured
+	 * (aka N1) at this temperature is provided in bits [31:20] in the
+	 * i.MX's OCOTP value ANA1.
+	 * To find the actual temperature T, the following formula has to be used
+	 * when reading value n from the sensor:
+	 *
+	 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
+	 *   = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
+	 *   = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
+	 *   = c2 - c1 * N
+	 *
+	 * with
+	 *
+	 *  T1' = 28.580661 °C
+	 *   c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
+	 *   c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
+	 *      = T1' + N1 * c1
+	 */
+	n1 = ocotp_ana1 >> 20;
+
+	temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
+	temp64 *= 1000; /* to get result in °mC */
+	do_div(temp64, 15423 * n1 - 4148468);
+	data->c1 = temp64;
+	data->c2 = n1 * data->c1 + 28581;
+
+	return 0;
+}
+
+static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
+{
+	struct imx_thermal_data *data = platform_get_drvdata(pdev);
+
+	/* The maximum die temp is specified by the Temperature Grade */
+	switch ((ocotp_mem0 >> 6) & 0x3) {
+	case 0: /* Commercial (0 to 95 °C) */
+		data->temp_grade = "Commercial";
+		data->temp_max = 95000;
+		break;
+	case 1: /* Extended Commercial (-20 °C to 105 °C) */
+		data->temp_grade = "Extended Commercial";
+		data->temp_max = 105000;
+		break;
+	case 2: /* Industrial (-40 °C to 105 °C) */
+		data->temp_grade = "Industrial";
+		data->temp_max = 105000;
+		break;
+	case 3: /* Automotive (-40 °C to 125 °C) */
+		data->temp_grade = "Automotive";
+		data->temp_max = 125000;
+		break;
+	}
+
+	/*
+	 * Set the critical trip point at 5 °C under max
+	 * Set the passive trip point at 10 °C under max (changeable via sysfs)
+	 */
+	data->temp_critical = data->temp_max - (1000 * 5);
+	data->temp_passive = data->temp_max - (1000 * 10);
+}
+
+static int imx_init_from_tempmon_data(struct platform_device *pdev)
+{
+	struct regmap *map;
+	int ret;
+	u32 val;
+
+	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+					      "fsl,tempmon-data");
+	if (IS_ERR(map)) {
+		ret = PTR_ERR(map);
+		dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_read(map, OCOTP_ANA1, &val);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
+		return ret;
+	}
+	ret = imx_init_calib(pdev, val);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(map, OCOTP_MEM0, &val);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
+		return ret;
+	}
+	imx_init_temp_grade(pdev, val);
+
+	return 0;
+}
+
+static int imx_init_from_nvmem_cells(struct platform_device *pdev)
+{
+	int ret;
+	u32 val;
+
+	ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
+	if (ret)
+		return ret;
+
+	ret = imx_init_calib(pdev, val);
+	if (ret)
+		return ret;
+
+	ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
+	if (ret)
+		return ret;
+	imx_init_temp_grade(pdev, val);
+
+	return 0;
+}
+
+static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
+{
+	struct imx_thermal_data *data = dev;
+
+	disable_irq_nosync(irq);
+	data->irq_enabled = false;
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
+{
+	struct imx_thermal_data *data = dev;
+
+	dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
+		data->alarm_temp / 1000);
+
+	thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
+
+	return IRQ_HANDLED;
+}
+
+static const struct of_device_id of_imx_thermal_match[] = {
+	{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
+	{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
+	{ .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
+	{ /* end */ }
+};
+MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
+
+/*
+ * Create cooling device in case no #cooling-cells property is available in
+ * CPU node
+ */
+static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
+{
+	struct device_node *np = of_get_cpu_node(data->policy->cpu, NULL);
+	int ret;
+
+	if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
+		data->cdev = cpufreq_cooling_register(data->policy);
+		if (IS_ERR(data->cdev)) {
+			ret = PTR_ERR(data->cdev);
+			cpufreq_cpu_put(data->policy);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int imx_thermal_probe(struct platform_device *pdev)
+{
+	struct imx_thermal_data *data;
+	struct regmap *map;
+	int measure_freq;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
+	if (IS_ERR(map)) {
+		ret = PTR_ERR(map);
+		dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
+		return ret;
+	}
+	data->tempmon = map;
+
+	data->socdata = of_device_get_match_data(&pdev->dev);
+	if (!data->socdata) {
+		dev_err(&pdev->dev, "no device match found\n");
+		return -ENODEV;
+	}
+
+	/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
+	if (data->socdata->version == TEMPMON_IMX6SX) {
+		regmap_write(map, IMX6_MISC1 + REG_CLR,
+			IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
+			| IMX6_MISC1_IRQ_TEMPPANIC);
+		/*
+		 * reset value of LOW ALARM is incorrect, set it to lowest
+		 * value to avoid false trigger of low alarm.
+		 */
+		regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
+			     data->socdata->low_alarm_mask);
+	}
+
+	data->irq = platform_get_irq(pdev, 0);
+	if (data->irq < 0)
+		return data->irq;
+
+	platform_set_drvdata(pdev, data);
+
+	if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
+		ret = imx_init_from_nvmem_cells(pdev);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+		if (ret) {
+			dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
+				ret);
+			return ret;
+		}
+	} else {
+		ret = imx_init_from_tempmon_data(pdev);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
+			return ret;
+		}
+	}
+
+	/* Make sure sensor is in known good state for measurements */
+	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
+		     data->socdata->power_down_mask);
+	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
+		     data->socdata->measure_temp_mask);
+	regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
+		     data->socdata->measure_freq_mask);
+	if (data->socdata->version != TEMPMON_IMX7D)
+		regmap_write(map, IMX6_MISC0 + REG_SET,
+			IMX6_MISC0_REFTOP_SELBIASOFF);
+	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
+		     data->socdata->power_down_mask);
+
+	data->policy = cpufreq_cpu_get(0);
+	if (!data->policy) {
+		pr_debug("%s: CPUFreq policy not found\n", __func__);
+		return -EPROBE_DEFER;
+	}
+
+	ret = imx_thermal_register_legacy_cooling(data);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"failed to register cpufreq cooling device: %d\n", ret);
+		return ret;
+	}
+
+	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(data->thermal_clk)) {
+		ret = PTR_ERR(data->thermal_clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"failed to get thermal clk: %d\n", ret);
+		cpufreq_cooling_unregister(data->cdev);
+		cpufreq_cpu_put(data->policy);
+		return ret;
+	}
+
+	/*
+	 * Thermal sensor needs clk on to get correct value, normally
+	 * we should enable its clk before taking measurement and disable
+	 * clk after measurement is done, but if alarm function is enabled,
+	 * hardware will auto measure the temperature periodically, so we
+	 * need to keep the clk always on for alarm function.
+	 */
+	ret = clk_prepare_enable(data->thermal_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
+		cpufreq_cooling_unregister(data->cdev);
+		cpufreq_cpu_put(data->policy);
+		return ret;
+	}
+
+	data->tz = thermal_zone_device_register("imx_thermal_zone",
+						IMX_TRIP_NUM,
+						BIT(IMX_TRIP_PASSIVE), data,
+						&imx_tz_ops, NULL,
+						IMX_PASSIVE_DELAY,
+						IMX_POLLING_DELAY);
+	if (IS_ERR(data->tz)) {
+		ret = PTR_ERR(data->tz);
+		dev_err(&pdev->dev,
+			"failed to register thermal zone device %d\n", ret);
+		clk_disable_unprepare(data->thermal_clk);
+		cpufreq_cooling_unregister(data->cdev);
+		cpufreq_cpu_put(data->policy);
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
+		 " critical:%dC passive:%dC\n", data->temp_grade,
+		 data->temp_max / 1000, data->temp_critical / 1000,
+		 data->temp_passive / 1000);
+
+	/* Enable measurements at ~ 10 Hz */
+	regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
+		     data->socdata->measure_freq_mask);
+	measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
+	regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
+		     measure_freq << data->socdata->measure_freq_shift);
+	imx_set_alarm_temp(data, data->temp_passive);
+
+	if (data->socdata->version == TEMPMON_IMX6SX)
+		imx_set_panic_temp(data, data->temp_critical);
+
+	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
+		     data->socdata->power_down_mask);
+	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
+		     data->socdata->measure_temp_mask);
+
+	data->irq_enabled = true;
+	data->mode = THERMAL_DEVICE_ENABLED;
+
+	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
+			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
+			0, "imx_thermal", data);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
+		clk_disable_unprepare(data->thermal_clk);
+		thermal_zone_device_unregister(data->tz);
+		cpufreq_cooling_unregister(data->cdev);
+		cpufreq_cpu_put(data->policy);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int imx_thermal_remove(struct platform_device *pdev)
+{
+	struct imx_thermal_data *data = platform_get_drvdata(pdev);
+	struct regmap *map = data->tempmon;
+
+	/* Disable measurements */
+	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
+		     data->socdata->power_down_mask);
+	if (!IS_ERR(data->thermal_clk))
+		clk_disable_unprepare(data->thermal_clk);
+
+	thermal_zone_device_unregister(data->tz);
+	cpufreq_cooling_unregister(data->cdev);
+	cpufreq_cpu_put(data->policy);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int imx_thermal_suspend(struct device *dev)
+{
+	struct imx_thermal_data *data = dev_get_drvdata(dev);
+	struct regmap *map = data->tempmon;
+
+	/*
+	 * Need to disable thermal sensor, otherwise, when thermal core
+	 * try to get temperature before thermal sensor resume, a wrong
+	 * temperature will be read as the thermal sensor is powered
+	 * down.
+	 */
+	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
+		     data->socdata->measure_temp_mask);
+	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
+		     data->socdata->power_down_mask);
+	data->mode = THERMAL_DEVICE_DISABLED;
+	clk_disable_unprepare(data->thermal_clk);
+
+	return 0;
+}
+
+static int imx_thermal_resume(struct device *dev)
+{
+	struct imx_thermal_data *data = dev_get_drvdata(dev);
+	struct regmap *map = data->tempmon;
+	int ret;
+
+	ret = clk_prepare_enable(data->thermal_clk);
+	if (ret)
+		return ret;
+	/* Enabled thermal sensor after resume */
+	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
+		     data->socdata->power_down_mask);
+	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
+		     data->socdata->measure_temp_mask);
+	data->mode = THERMAL_DEVICE_ENABLED;
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
+			 imx_thermal_suspend, imx_thermal_resume);
+
+static struct platform_driver imx_thermal = {
+	.driver = {
+		.name	= "imx_thermal",
+		.pm	= &imx_thermal_pm_ops,
+		.of_match_table = of_imx_thermal_match,
+	},
+	.probe		= imx_thermal_probe,
+	.remove		= imx_thermal_remove,
+};
+module_platform_driver(imx_thermal);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:imx-thermal");