drivers/thermal/uniphier_thermal.c - linux-imx - Git at Google

 /**
  * uniphier_thermal.c - Socionext UniPhier thermal driver
  *
  * Copyright 2014      Panasonic Corporation
  * Copyright 2016-2017 Socionext Inc.
  * All rights reserved.
  *
  * Author:
  *	Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2  of
  * the License as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/bitops.h>
 #include <linux/interrupt.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/thermal.h>

 #include "thermal_core.h"

 /*
  * block registers
  * addresses are the offset from .block_base
  */
 #define PVTCTLEN			0x0000
 #define PVTCTLEN_EN			BIT(0)

 #define PVTCTLMODE			0x0004
 #define PVTCTLMODE_MASK			0xf
 #define PVTCTLMODE_TEMPMON		0x5

 #define EMONREPEAT			0x0040
 #define EMONREPEAT_ENDLESS		BIT(24)
 #define EMONREPEAT_PERIOD		GENMASK(3, 0)
 #define EMONREPEAT_PERIOD_1000000	0x9

 /*
  * common registers
  * addresses are the offset from .map_base
  */
 #define PVTCTLSEL			0x0900
 #define PVTCTLSEL_MASK			GENMASK(2, 0)
 #define PVTCTLSEL_MONITOR		0

 #define SETALERT0			0x0910
 #define SETALERT1			0x0914
 #define SETALERT2			0x0918
 #define SETALERT_TEMP_OVF		(GENMASK(7, 0) << 16)
 #define SETALERT_TEMP_OVF_VALUE(val)	(((val) & GENMASK(7, 0)) << 16)
 #define SETALERT_EN			BIT(0)

 #define PMALERTINTCTL			0x0920
 #define PMALERTINTCTL_CLR(ch)		BIT(4 * (ch) + 2)
 #define PMALERTINTCTL_SET(ch)		BIT(4 * (ch) + 1)
 #define PMALERTINTCTL_EN(ch)		BIT(4 * (ch) + 0)
 #define PMALERTINTCTL_MASK		(GENMASK(10, 8) | GENMASK(6, 4) | \
 					 GENMASK(2, 0))

 #define TMOD				0x0928
 #define TMOD_WIDTH			9

 #define TMODCOEF			0x0e5c

 #define TMODSETUP0_EN			BIT(30)
 #define TMODSETUP0_VAL(val)		(((val) & GENMASK(13, 0)) << 16)
 #define TMODSETUP1_EN			BIT(15)
 #define TMODSETUP1_VAL(val)		((val) & GENMASK(14, 0))

 /* SoC critical temperature */
 #define CRITICAL_TEMP_LIMIT		(120 * 1000)

 /* Max # of alert channels */
 #define ALERT_CH_NUM			3

 /* SoC specific thermal sensor data */
 struct uniphier_tm_soc_data {
 	u32 map_base;
 	u32 block_base;
 	u32 tmod_setup_addr;
 };

 struct uniphier_tm_dev {
 	struct regmap *regmap;
 	struct device *dev;
 	bool alert_en[ALERT_CH_NUM];
 	struct thermal_zone_device *tz_dev;
 	const struct uniphier_tm_soc_data *data;
 };

 static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev)
 {
 	struct regmap *map = tdev->regmap;
 	u32 val;
 	u32 tmod_calib[2];
 	int ret;

 	/* stop PVT */
 	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
 			  PVTCTLEN_EN, 0);

 	/*
 	 * Since SoC has a calibrated value that was set in advance,
 	 * TMODCOEF shows non-zero and PVT refers the value internally.
 	 *
 	 * If TMODCOEF shows zero, the boards don't have the calibrated
 	 * value, and the driver has to set default value from DT.
 	 */
 	ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val);
 	if (ret)
 		return ret;
 	if (!val) {
 		/* look for the default values in DT */
 		ret = of_property_read_u32_array(tdev->dev->of_node,
 						 "socionext,tmod-calibration",
 						 tmod_calib,
 						 ARRAY_SIZE(tmod_calib));
 		if (ret)
 			return ret;

 		regmap_write(map, tdev->data->tmod_setup_addr,
 			TMODSETUP0_EN | TMODSETUP0_VAL(tmod_calib[0]) |
 			TMODSETUP1_EN | TMODSETUP1_VAL(tmod_calib[1]));
 	}

 	/* select temperature mode */
 	regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
 			  PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);

 	/* set monitoring period */
 	regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
 			  EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD,
 			  EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD_1000000);

 	/* set monitor mode */
 	regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
 			  PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);

 	return 0;
 }

 static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch,
 				  u32 temp)
 {
 	struct regmap *map = tdev->regmap;

 	/* set alert temperature */
 	regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2),
 			  SETALERT_EN | SETALERT_TEMP_OVF,
 			  SETALERT_EN |
 			  SETALERT_TEMP_OVF_VALUE(temp / 1000));
 }

 static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
 {
 	struct regmap *map = tdev->regmap;
 	int i;
 	u32 bits = 0;

 	for (i = 0; i < ALERT_CH_NUM; i++)
 		if (tdev->alert_en[i])
 			bits |= PMALERTINTCTL_EN(i);

 	/* enable alert interrupt */
 	regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
 			  PMALERTINTCTL_MASK, bits);

 	/* start PVT */
 	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
 			  PVTCTLEN_EN, PVTCTLEN_EN);

 	usleep_range(700, 1500);	/* The spec note says at least 700us */
 }

 static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
 {
 	struct regmap *map = tdev->regmap;

 	/* disable alert interrupt */
 	regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
 			  PMALERTINTCTL_MASK, 0);

 	/* stop PVT */
 	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
 			  PVTCTLEN_EN, 0);

 	usleep_range(1000, 2000);	/* The spec note says at least 1ms */
 }

 static int uniphier_tm_get_temp(void *data, int *out_temp)
 {
 	struct uniphier_tm_dev *tdev = data;
 	struct regmap *map = tdev->regmap;
 	int ret;
 	u32 temp;

 	ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
 	if (ret)
 		return ret;

 	/* MSB of the TMOD field is a sign bit */
 	*out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000;

 	return 0;
 }

 static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = {
 	.get_temp = uniphier_tm_get_temp,
 };

 static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
 {
 	u32 mask = 0, bits = 0;
 	int i;

 	for (i = 0; i < ALERT_CH_NUM; i++) {
 		mask |= (PMALERTINTCTL_CLR(i) | PMALERTINTCTL_SET(i));
 		bits |= PMALERTINTCTL_CLR(i);
 	}

 	/* clear alert interrupt */
 	regmap_write_bits(tdev->regmap,
 			  tdev->data->map_base + PMALERTINTCTL, mask, bits);
 }

 static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
 {
 	struct uniphier_tm_dev *tdev = _tdev;

 	disable_irq_nosync(irq);
 	uniphier_tm_irq_clear(tdev);

 	return IRQ_WAKE_THREAD;
 }

 static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev)
 {
 	struct uniphier_tm_dev *tdev = _tdev;

 	thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED);

 	return IRQ_HANDLED;
 }

 static int uniphier_tm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct regmap *regmap;
 	struct device_node *parent;
 	struct uniphier_tm_dev *tdev;
 	const struct thermal_trip *trips;
 	int i, ret, irq, ntrips, crit_temp = INT_MAX;

 	tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
 	if (!tdev)
 		return -ENOMEM;
 	tdev->dev = dev;

 	tdev->data = of_device_get_match_data(dev);
 	if (WARN_ON(!tdev->data))
 		return -EINVAL;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	/* get regmap from syscon node */
 	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
 	regmap = syscon_node_to_regmap(parent);
 	of_node_put(parent);
 	if (IS_ERR(regmap)) {
 		dev_err(dev, "failed to get regmap (error %ld)\n",
 			PTR_ERR(regmap));
 		return PTR_ERR(regmap);
 	}
 	tdev->regmap = regmap;

 	ret = uniphier_tm_initialize_sensor(tdev);
 	if (ret) {
 		dev_err(dev, "failed to initialize sensor\n");
 		return ret;
 	}

 	ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq,
 					uniphier_tm_alarm_irq_thread,
 					0, "thermal", tdev);
 	if (ret)
 		return ret;

 	platform_set_drvdata(pdev, tdev);

 	tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev,
 						&uniphier_of_thermal_ops);
 	if (IS_ERR(tdev->tz_dev)) {
 		dev_err(dev, "failed to register sensor device\n");
 		return PTR_ERR(tdev->tz_dev);
 	}

 	/* get trip points */
 	trips = of_thermal_get_trip_points(tdev->tz_dev);
 	ntrips = of_thermal_get_ntrips(tdev->tz_dev);
 	if (ntrips > ALERT_CH_NUM) {
 		dev_err(dev, "thermal zone has too many trips\n");
 		return -E2BIG;
 	}

 	/* set alert temperatures */
 	for (i = 0; i < ntrips; i++) {
 		if (trips[i].type == THERMAL_TRIP_CRITICAL &&
 		    trips[i].temperature < crit_temp)
 			crit_temp = trips[i].temperature;
 		uniphier_tm_set_alert(tdev, i, trips[i].temperature);
 		tdev->alert_en[i] = true;
 	}
 	if (crit_temp > CRITICAL_TEMP_LIMIT) {
 		dev_err(dev, "critical trip is over limit(>%d), or not set\n",
 			CRITICAL_TEMP_LIMIT);
 		return -EINVAL;
 	}

 	uniphier_tm_enable_sensor(tdev);

 	return 0;
 }

 static int uniphier_tm_remove(struct platform_device *pdev)
 {
 	struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);

 	/* disable sensor */
 	uniphier_tm_disable_sensor(tdev);

 	return 0;
 }

 static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
 	.map_base        = 0xe000,
 	.block_base      = 0xe000,
 	.tmod_setup_addr = 0xe904,
 };

 static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
 	.map_base        = 0xe000,
 	.block_base      = 0xe800,
 	.tmod_setup_addr = 0xe938,
 };

 static const struct of_device_id uniphier_tm_dt_ids[] = {
 	{
 		.compatible = "socionext,uniphier-pxs2-thermal",
 		.data       = &uniphier_pxs2_tm_data,
 	},
 	{
 		.compatible = "socionext,uniphier-ld20-thermal",
 		.data       = &uniphier_ld20_tm_data,
 	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);

 static struct platform_driver uniphier_tm_driver = {
 	.probe = uniphier_tm_probe,
 	.remove = uniphier_tm_remove,
 	.driver = {
 		.name = "uniphier-thermal",
 		.of_match_table = uniphier_tm_dt_ids,
 	},
 };
 module_platform_driver(uniphier_tm_driver);

 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
 MODULE_DESCRIPTION("UniPhier thermal driver");
 MODULE_LICENSE("GPL v2");
	/**
	* uniphier_thermal.c - Socionext UniPhier thermal driver
	*
	* Copyright 2014 Panasonic Corporation
	* Copyright 2016-2017 Socionext Inc.
	* All rights reserved.
	*
	* Author:
	* Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 of
	* the License as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/bitops.h>
	#include <linux/interrupt.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/thermal.h>

	#include "thermal_core.h"

	/*
	* block registers
	* addresses are the offset from .block_base
	*/
	#define PVTCTLEN 0x0000
	#define PVTCTLEN_EN BIT(0)

	#define PVTCTLMODE 0x0004
	#define PVTCTLMODE_MASK 0xf
	#define PVTCTLMODE_TEMPMON 0x5

	#define EMONREPEAT 0x0040
	#define EMONREPEAT_ENDLESS BIT(24)
	#define EMONREPEAT_PERIOD GENMASK(3, 0)
	#define EMONREPEAT_PERIOD_1000000 0x9

	/*
	* common registers
	* addresses are the offset from .map_base
	*/
	#define PVTCTLSEL 0x0900
	#define PVTCTLSEL_MASK GENMASK(2, 0)
	#define PVTCTLSEL_MONITOR 0

	#define SETALERT0 0x0910
	#define SETALERT1 0x0914
	#define SETALERT2 0x0918
	#define SETALERT_TEMP_OVF (GENMASK(7, 0) << 16)
	#define SETALERT_TEMP_OVF_VALUE(val) (((val) & GENMASK(7, 0)) << 16)
	#define SETALERT_EN BIT(0)

	#define PMALERTINTCTL 0x0920
	#define PMALERTINTCTL_CLR(ch) BIT(4 * (ch) + 2)
	#define PMALERTINTCTL_SET(ch) BIT(4 * (ch) + 1)
	#define PMALERTINTCTL_EN(ch) BIT(4 * (ch) + 0)
	#define PMALERTINTCTL_MASK (GENMASK(10, 8) \| GENMASK(6, 4) \| \
	GENMASK(2, 0))

	#define TMOD 0x0928
	#define TMOD_WIDTH 9

	#define TMODCOEF 0x0e5c

	#define TMODSETUP0_EN BIT(30)
	#define TMODSETUP0_VAL(val) (((val) & GENMASK(13, 0)) << 16)
	#define TMODSETUP1_EN BIT(15)
	#define TMODSETUP1_VAL(val) ((val) & GENMASK(14, 0))

	/* SoC critical temperature */
	#define CRITICAL_TEMP_LIMIT (120 * 1000)

	/* Max # of alert channels */
	#define ALERT_CH_NUM 3

	/* SoC specific thermal sensor data */
	struct uniphier_tm_soc_data {
	u32 map_base;
	u32 block_base;
	u32 tmod_setup_addr;
	};

	struct uniphier_tm_dev {
	struct regmap *regmap;
	struct device *dev;
	bool alert_en[ALERT_CH_NUM];
	struct thermal_zone_device *tz_dev;
	const struct uniphier_tm_soc_data *data;
	};

	static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev)
	{
	struct regmap *map = tdev->regmap;
	u32 val;
	u32 tmod_calib[2];
	int ret;

	/* stop PVT */
	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
	PVTCTLEN_EN, 0);

	/*
	* Since SoC has a calibrated value that was set in advance,
	* TMODCOEF shows non-zero and PVT refers the value internally.
	*
	* If TMODCOEF shows zero, the boards don't have the calibrated
	* value, and the driver has to set default value from DT.
	*/
	ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val);
	if (ret)
	return ret;
	if (!val) {
	/* look for the default values in DT */
	ret = of_property_read_u32_array(tdev->dev->of_node,
	"socionext,tmod-calibration",
	tmod_calib,
	ARRAY_SIZE(tmod_calib));
	if (ret)
	return ret;

	regmap_write(map, tdev->data->tmod_setup_addr,
	TMODSETUP0_EN \| TMODSETUP0_VAL(tmod_calib[0]) \|
	TMODSETUP1_EN \| TMODSETUP1_VAL(tmod_calib[1]));
	}

	/* select temperature mode */
	regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
	PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);

	/* set monitoring period */
	regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
	EMONREPEAT_ENDLESS \| EMONREPEAT_PERIOD,
	EMONREPEAT_ENDLESS \| EMONREPEAT_PERIOD_1000000);

	/* set monitor mode */
	regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
	PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);

	return 0;
	}

	static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch,
	u32 temp)
	{
	struct regmap *map = tdev->regmap;

	/* set alert temperature */
	regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2),
	SETALERT_EN \| SETALERT_TEMP_OVF,
	SETALERT_EN \|
	SETALERT_TEMP_OVF_VALUE(temp / 1000));
	}

	static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
	{
	struct regmap *map = tdev->regmap;
	int i;
	u32 bits = 0;

	for (i = 0; i < ALERT_CH_NUM; i++)
	if (tdev->alert_en[i])
	bits \|= PMALERTINTCTL_EN(i);

	/* enable alert interrupt */
	regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
	PMALERTINTCTL_MASK, bits);

	/* start PVT */
	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
	PVTCTLEN_EN, PVTCTLEN_EN);

	usleep_range(700, 1500); /* The spec note says at least 700us */
	}

	static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
	{
	struct regmap *map = tdev->regmap;

	/* disable alert interrupt */
	regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
	PMALERTINTCTL_MASK, 0);

	/* stop PVT */
	regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
	PVTCTLEN_EN, 0);

	usleep_range(1000, 2000); /* The spec note says at least 1ms */
	}

	static int uniphier_tm_get_temp(void data, int out_temp)
	{
	struct uniphier_tm_dev *tdev = data;
	struct regmap *map = tdev->regmap;
	int ret;
	u32 temp;

	ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
	if (ret)
	return ret;

	/* MSB of the TMOD field is a sign bit */
	out_temp = sign_extend32(temp, TMOD_WIDTH - 1) 1000;

	return 0;
	}

	static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = {
	.get_temp = uniphier_tm_get_temp,
	};

	static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
	{
	u32 mask = 0, bits = 0;
	int i;

	for (i = 0; i < ALERT_CH_NUM; i++) {
	mask \|= (PMALERTINTCTL_CLR(i) \| PMALERTINTCTL_SET(i));
	bits \|= PMALERTINTCTL_CLR(i);
	}

	/* clear alert interrupt */
	regmap_write_bits(tdev->regmap,
	tdev->data->map_base + PMALERTINTCTL, mask, bits);
	}

	static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
	{
	struct uniphier_tm_dev *tdev = _tdev;

	disable_irq_nosync(irq);
	uniphier_tm_irq_clear(tdev);

	return IRQ_WAKE_THREAD;
	}

	static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev)
	{
	struct uniphier_tm_dev *tdev = _tdev;

	thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED);

	return IRQ_HANDLED;
	}

	static int uniphier_tm_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct regmap *regmap;
	struct device_node *parent;
	struct uniphier_tm_dev *tdev;
	const struct thermal_trip *trips;
	int i, ret, irq, ntrips, crit_temp = INT_MAX;

	tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
	if (!tdev)
	return -ENOMEM;
	tdev->dev = dev;

	tdev->data = of_device_get_match_data(dev);
	if (WARN_ON(!tdev->data))
	return -EINVAL;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	/* get regmap from syscon node */
	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
	regmap = syscon_node_to_regmap(parent);
	of_node_put(parent);
	if (IS_ERR(regmap)) {
	dev_err(dev, "failed to get regmap (error %ld)\n",
	PTR_ERR(regmap));
	return PTR_ERR(regmap);
	}
	tdev->regmap = regmap;

	ret = uniphier_tm_initialize_sensor(tdev);
	if (ret) {
	dev_err(dev, "failed to initialize sensor\n");
	return ret;
	}

	ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq,
	uniphier_tm_alarm_irq_thread,
	0, "thermal", tdev);
	if (ret)
	return ret;

	platform_set_drvdata(pdev, tdev);

	tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev,
	&uniphier_of_thermal_ops);
	if (IS_ERR(tdev->tz_dev)) {
	dev_err(dev, "failed to register sensor device\n");
	return PTR_ERR(tdev->tz_dev);
	}

	/* get trip points */
	trips = of_thermal_get_trip_points(tdev->tz_dev);
	ntrips = of_thermal_get_ntrips(tdev->tz_dev);
	if (ntrips > ALERT_CH_NUM) {
	dev_err(dev, "thermal zone has too many trips\n");
	return -E2BIG;
	}

	/* set alert temperatures */
	for (i = 0; i < ntrips; i++) {
	if (trips[i].type == THERMAL_TRIP_CRITICAL &&
	trips[i].temperature < crit_temp)
	crit_temp = trips[i].temperature;
	uniphier_tm_set_alert(tdev, i, trips[i].temperature);
	tdev->alert_en[i] = true;
	}
	if (crit_temp > CRITICAL_TEMP_LIMIT) {
	dev_err(dev, "critical trip is over limit(>%d), or not set\n",
	CRITICAL_TEMP_LIMIT);
	return -EINVAL;
	}

	uniphier_tm_enable_sensor(tdev);

	return 0;
	}

	static int uniphier_tm_remove(struct platform_device *pdev)
	{
	struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);

	/* disable sensor */
	uniphier_tm_disable_sensor(tdev);

	return 0;
	}

	static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
	.map_base = 0xe000,
	.block_base = 0xe000,
	.tmod_setup_addr = 0xe904,
	};

	static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
	.map_base = 0xe000,
	.block_base = 0xe800,
	.tmod_setup_addr = 0xe938,
	};

	static const struct of_device_id uniphier_tm_dt_ids[] = {
	{
	.compatible = "socionext,uniphier-pxs2-thermal",
	.data = &uniphier_pxs2_tm_data,
	},
	{
	.compatible = "socionext,uniphier-ld20-thermal",
	.data = &uniphier_ld20_tm_data,
	},
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);

	static struct platform_driver uniphier_tm_driver = {
	.probe = uniphier_tm_probe,
	.remove = uniphier_tm_remove,
	.driver = {
	.name = "uniphier-thermal",
	.of_match_table = uniphier_tm_dt_ids,
	},
	};
	module_platform_driver(uniphier_tm_driver);

	MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
	MODULE_DESCRIPTION("UniPhier thermal driver");
	MODULE_LICENSE("GPL v2");