Subject: [PATCH v7 4/4] thermal: Add Tegra SOCTHERM thermal management driver

From: [email-masked] (Mikko Perttunen)
Date: Sat, 08 Nov 2014 03:11:23 +0200

On 11/07/2014 05:54 PM, Eduardo Valentin wrote:
> Terve Mikko,
>
> On Wed, Oct 15, 2014 at 01:05:19PM +0300, Mikko Perttunen wrote:
>> Eduardo: ping
>>
>
>
> I had no objections with the driver at this point. Neither with the DT
> part. I decided to include it in my -linus queue, which means, it will
> hopefully be queued in the next major merge windown (v3.19).
>
> I also merged it to my -next branch, for linux-next testing.

Great! Thanks.

>
>
>> Cheers,
>> Mikko
>>
>> On 09/29/2014 05:17 PM, Mikko Perttunen wrote:
>>> From: Mikko Perttunen <[email-masked]>
>
> BTW, this nvidia address is bouncing. I noticed because my automated
> 'I applied it on queue xyz' notification message has returned.

Yeah, I'm working at NVIDIA only during summer. Looks like this time 
they decided to deactivate my email there.

>
>>>
>>> This adds support for the Tegra SOCTHERM thermal sensing and management
>>> system found in the Tegra124 system-on-chip. This initial driver supports
>>> temperature polling for four thermal zones.
>>>
>>> Signed-off-by: Mikko Perttunen <[email-masked]>
>>> ---
>>> v7: bunch of style fixes
>>>
>>>    drivers/thermal/Kconfig          |  10 +
>>>    drivers/thermal/Makefile         |   1 +
>>>    drivers/thermal/tegra_soctherm.c | 473 +++++++++++++++++++++++++++++++++++++++
>>>    3 files changed, 484 insertions(+)
>>>    create mode 100644 drivers/thermal/tegra_soctherm.c
>>>
>>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>>> index 693208e..fd9d049 100644
>>> --- a/drivers/thermal/Kconfig
>>> +++ b/drivers/thermal/Kconfig
>>> @@ -175,6 +175,16 @@ config ARMADA_THERMAL
>>>    	  Enable this option if you want to have support for thermal management
>>>    	  controller present in Armada 370 and Armada XP SoC.
>>>
>>> +config TEGRA_SOCTHERM
>>> +	tristate "Tegra SOCTHERM thermal management"
>>> +	depends on ARCH_TEGRA
>>> +	help
>>> +	  Enable this option for integrated thermal management support on NVIDIA
>>> +	  Tegra124 systems-on-chip. The driver supports four thermal zones
>>> +	  (CPU, GPU, MEM, PLLX). Cooling devices can be bound to the thermal
>>> +	  zones to manage temperatures. This option is also required for the
>>> +	  emergency thermal reset (thermtrip) feature to function.
>>> +
>>>    config DB8500_CPUFREQ_COOLING
>>>    	tristate "DB8500 cpufreq cooling"
>>>    	depends on ARCH_U8500
>>> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
>>> index 31e232f..f0b94d5 100644
>>> --- a/drivers/thermal/Makefile
>>> +++ b/drivers/thermal/Makefile
>>> @@ -33,3 +33,4 @@ obj-$(CONFIG_INTEL_SOC_DTS_THERMAL)	+= intel_soc_dts_thermal.o
>>>    obj-$(CONFIG_TI_SOC_THERMAL)	+= ti-soc-thermal/
>>>    obj-$(CONFIG_ACPI_INT3403_THERMAL)	+= int3403_thermal.o
>>>    obj-$(CONFIG_ST_THERMAL)	+= st/
>>> +obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
>>> diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c
>>> new file mode 100644
>>> index 0000000..70f7e9e
>>> --- /dev/null
>>> +++ b/drivers/thermal/tegra_soctherm.c
>>> @@ -0,0 +1,473 @@
>>> +/*
>>> + * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
>>> + *
>>> + * Author:
>>> + *	Mikko Perttunen <[email-masked]>
>>> + *
>
> Might be time to send a patch on top of my -linus queue to update the
> above with a valid email address.
>
> Thanks,
>
>>> + * This software is licensed under the terms of the GNU General Public
>>> + * License version 2, as published by the Free Software Foundation, and
>>> + * may be copied, distributed, and modified under those terms.
>>> + *
>>> + * 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/clk.h>
>>> +#include <linux/delay.h>
>>> +#include <linux/err.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/io.h>
>>> +#include <linux/module.h>
>>> +#include <linux/of.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/reset.h>
>>> +#include <linux/thermal.h>
>>> +
>>> +#include <soc/tegra/fuse.h>
>>> +
>>> +#define SENSOR_CONFIG0				0
>>> +#define SENSOR_CONFIG0_STOP			BIT(0)
>>> +#define SENSOR_CONFIG0_TALL_SHIFT		8
>>> +#define SENSOR_CONFIG0_TCALC_OVER		BIT(4)
>>> +#define SENSOR_CONFIG0_OVER			BIT(3)
>>> +#define SENSOR_CONFIG0_CPTR_OVER		BIT(2)
>>> +
>>> +#define SENSOR_CONFIG1				4
>>> +#define SENSOR_CONFIG1_TSAMPLE_SHIFT		0
>>> +#define SENSOR_CONFIG1_TIDDQ_EN_SHIFT		15
>>> +#define SENSOR_CONFIG1_TEN_COUNT_SHIFT		24
>>> +#define SENSOR_CONFIG1_TEMP_ENABLE		BIT(31)
>>> +
>>> +#define SENSOR_CONFIG2				8
>>> +#define SENSOR_CONFIG2_THERMA_SHIFT		16
>>> +#define SENSOR_CONFIG2_THERMB_SHIFT		0
>>> +
>>> +#define SENSOR_PDIV				0x1c0
>>> +#define SENSOR_PDIV_T124			0x8888
>>> +#define SENSOR_HOTSPOT_OFF			0x1c4
>>> +#define SENSOR_HOTSPOT_OFF_T124			0x00060600
>>> +#define SENSOR_TEMP1				0x1c8
>>> +#define SENSOR_TEMP2				0x1cc
>>> +
>>> +#define SENSOR_TEMP_MASK			0xffff
>>> +#define READBACK_VALUE_MASK			0xff00
>>> +#define READBACK_VALUE_SHIFT			8
>>> +#define READBACK_ADD_HALF			BIT(7)
>>> +#define READBACK_NEGATE				BIT(1)
>>> +
>>> +#define FUSE_TSENSOR8_CALIB			0x180
>>> +#define FUSE_SPARE_REALIGNMENT_REG_0		0x1fc
>>> +
>>> +#define FUSE_TSENSOR_CALIB_CP_TS_BASE_MASK	0x1fff
>>> +#define FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK	(0x1fff << 13)
>>> +#define FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT	13
>>> +
>>> +#define FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK	0x3ff
>>> +#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK	(0x7ff << 10)
>>> +#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT	10
>>> +
>>> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_CP_MASK 0x3f
>>> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK (0x1f << 21)
>>> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT 21
>>> +
>>> +#define NOMINAL_CALIB_FT_T124			105
>>> +#define NOMINAL_CALIB_CP_T124			25
>>> +
>>> +struct tegra_tsensor_configuration {
>>> +	u32 tall, tsample, tiddq_en, ten_count, pdiv, tsample_ate, pdiv_ate;
>>> +};
>>> +
>>> +struct tegra_tsensor {
>>> +	const struct tegra_tsensor_configuration *config;
>>> +	u32 base, calib_fuse_offset;
>>> +	/* Correction values used to modify values read from calibration fuses */
>>> +	s32 fuse_corr_alpha, fuse_corr_beta;
>>> +};
>>> +
>>> +struct tegra_thermctl_zone {
>>> +	void __iomem *reg;
>>> +	unsigned int shift;
>>> +};
>>> +
>>> +static const struct tegra_tsensor_configuration t124_tsensor_config = {
>>> +	.tall = 16300,
>>> +	.tsample = 120,
>>> +	.tiddq_en = 1,
>>> +	.ten_count = 1,
>>> +	.pdiv = 8,
>>> +	.tsample_ate = 480,
>>> +	.pdiv_ate = 8
>>> +};
>>> +
>>> +static const struct tegra_tsensor t124_tsensors[] = {
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0xc0,
>>> +		.calib_fuse_offset = 0x098,
>>> +		.fuse_corr_alpha = 1135400,
>>> +		.fuse_corr_beta = -6266900,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0xe0,
>>> +		.calib_fuse_offset = 0x084,
>>> +		.fuse_corr_alpha = 1122220,
>>> +		.fuse_corr_beta = -5700700,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x100,
>>> +		.calib_fuse_offset = 0x088,
>>> +		.fuse_corr_alpha = 1127000,
>>> +		.fuse_corr_beta = -6768200,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x120,
>>> +		.calib_fuse_offset = 0x12c,
>>> +		.fuse_corr_alpha = 1110900,
>>> +		.fuse_corr_beta = -6232000,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x140,
>>> +		.calib_fuse_offset = 0x158,
>>> +		.fuse_corr_alpha = 1122300,
>>> +		.fuse_corr_beta = -5936400,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x160,
>>> +		.calib_fuse_offset = 0x15c,
>>> +		.fuse_corr_alpha = 1145700,
>>> +		.fuse_corr_beta = -7124600,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x180,
>>> +		.calib_fuse_offset = 0x154,
>>> +		.fuse_corr_alpha = 1120100,
>>> +		.fuse_corr_beta = -6000500,
>>> +	},
>>> +	{
>>> +		.config = &t124_tsensor_config,
>>> +		.base = 0x1a0,
>>> +		.calib_fuse_offset = 0x160,
>>> +		.fuse_corr_alpha = 1106500,
>>> +		.fuse_corr_beta = -6729300,
>>> +	},
>>> +};
>>> +
>>> +struct tegra_soctherm {
>>> +	struct reset_control *reset;
>>> +	struct clk *clock_tsensor;
>>> +	struct clk *clock_soctherm;
>>> +	void __iomem *regs;
>>> +
>>> +	struct thermal_zone_device *thermctl_tzs[4];
>>> +};
>>> +
>>> +struct tsensor_shared_calibration {
>>> +	u32 base_cp, base_ft;
>>> +	u32 actual_temp_cp, actual_temp_ft;
>>> +};
>>> +
>>> +static int calculate_shared_calibration(struct tsensor_shared_calibration *r)
>>> +{
>>> +	u32 val, shifted_cp, shifted_ft;
>>> +	int err;
>>> +
>>> +	err = tegra_fuse_readl(FUSE_TSENSOR8_CALIB, &val);
>>> +	if (err)
>>> +		return err;
>>> +	r->base_cp = val & FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK;
>>> +	r->base_ft = (val & FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK)
>>> +		>> FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT;
>>> +	val = ((val & FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK)
>>> +		>> FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT);
>>> +	shifted_ft = sign_extend32(val, 4);
>>> +
>>> +	err = tegra_fuse_readl(FUSE_SPARE_REALIGNMENT_REG_0, &val);
>>> +	if (err)
>>> +		return err;
>>> +	shifted_cp = sign_extend32(val, 5);
>>> +
>>> +	r->actual_temp_cp = 2 * NOMINAL_CALIB_CP_T124 + shifted_cp;
>>> +	r->actual_temp_ft = 2 * NOMINAL_CALIB_FT_T124 + shifted_ft;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static s64 div64_s64_precise(s64 a, s64 b)
>>> +{
>>> +	s64 r, al;
>>> +
>>> +	/* Scale up for increased precision division */
>>> +	al = a << 16;
>>> +
>>> +	r = div64_s64(al * 2 + 1, 2 * b);
>>> +	return r >> 16;
>>> +}
>>> +
>>> +static int
>>> +calculate_tsensor_calibration(const struct tegra_tsensor *sensor,
>>> +			      const struct tsensor_shared_calibration *shared,
>>> +			      u32 *calib)
>>> +{
>>> +	u32 val;
>>> +	s32 actual_tsensor_ft, actual_tsensor_cp, delta_sens, delta_temp,
>>> +	    mult, div;
>>> +	s16 therma, thermb;
>>> +	s64 tmp;
>>> +	int err;
>>> +
>>> +	err = tegra_fuse_readl(sensor->calib_fuse_offset, &val);
>>> +	if (err)
>>> +		return err;
>>> +
>>> +	actual_tsensor_cp = (shared->base_cp * 64) + sign_extend32(val, 12);
>>> +	val = (val & FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK)
>>> +		>> FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT;
>>> +	actual_tsensor_ft = (shared->base_ft * 32) + sign_extend32(val, 12);
>>> +
>>> +	delta_sens = actual_tsensor_ft - actual_tsensor_cp;
>>> +	delta_temp = shared->actual_temp_ft - shared->actual_temp_cp;
>>> +
>>> +	mult = sensor->config->pdiv * sensor->config->tsample_ate;
>>> +	div = sensor->config->tsample * sensor->config->pdiv_ate;
>>> +
>>> +	therma = div64_s64_precise((s64) delta_temp * (1LL << 13) * mult,
>>> +				   (s64) delta_sens * div);
>>> +
>>> +	tmp = (s64)actual_tsensor_ft * shared->actual_temp_cp -
>>> +	      (s64)actual_tsensor_cp * shared->actual_temp_ft;
>>> +	thermb = div64_s64_precise(tmp, (s64)delta_sens);
>>> +
>>> +	therma = div64_s64_precise((s64)therma * sensor->fuse_corr_alpha,
>>> +				   (s64)1000000LL);
>>> +	thermb = div64_s64_precise((s64)thermb * sensor->fuse_corr_alpha +
>>> +				   sensor->fuse_corr_beta, (s64)1000000LL);
>>> +
>>> +	*calib = ((u16)therma << SENSOR_CONFIG2_THERMA_SHIFT) |
>>> +		 ((u16)thermb << SENSOR_CONFIG2_THERMB_SHIFT);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int enable_tsensor(struct tegra_soctherm *tegra,
>>> +			  const struct tegra_tsensor *sensor,
>>> +			  const struct tsensor_shared_calibration *shared)
>>> +{
>>> +	void __iomem *base = tegra->regs + sensor->base;
>>> +	unsigned int val;
>>> +	u32 calib;
>>> +	int err;
>>> +
>>> +	err = calculate_tsensor_calibration(sensor, shared, &calib);
>>> +	if (err)
>>> +		return err;
>>> +
>>> +	val = sensor->config->tall << SENSOR_CONFIG0_TALL_SHIFT;
>>> +	writel(val, base + SENSOR_CONFIG0);
>>> +
>>> +	val  = (sensor->config->tsample - 1) << SENSOR_CONFIG1_TSAMPLE_SHIFT;
>>> +	val |= sensor->config->tiddq_en << SENSOR_CONFIG1_TIDDQ_EN_SHIFT;
>>> +	val |= sensor->config->ten_count << SENSOR_CONFIG1_TEN_COUNT_SHIFT;
>>> +	val |= SENSOR_CONFIG1_TEMP_ENABLE;
>>> +	writel(val, base + SENSOR_CONFIG1);
>>> +
>>> +	writel(calib, base + SENSOR_CONFIG2);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +/*
>>> + * Translate from soctherm readback format to millicelsius.
>>> + * The soctherm readback format in bits is as follows:
>>> + *   TTTTTTTT H______N
>>> + * where T's contain the temperature in Celsius,
>>> + * H denotes an addition of 0.5 Celsius and N denotes negation
>>> + * of the final value.
>>> + */
>>> +static long translate_temp(u16 val)
>>> +{
>>> +	long t;
>>> +
>>> +	t = ((val & READBACK_VALUE_MASK) >> READBACK_VALUE_SHIFT) * 1000;
>>> +	if (val & READBACK_ADD_HALF)
>>> +		t += 500;
>>> +	if (val & READBACK_NEGATE)
>>> +		t *= -1;
>>> +
>>> +	return t;
>>> +}
>>> +
>>> +static int tegra_thermctl_get_temp(void *data, long *out_temp)
>>> +{
>>> +	struct tegra_thermctl_zone *zone = data;
>>> +	u32 val;
>>> +
>>> +	val = (readl(zone->reg) >> zone->shift) & SENSOR_TEMP_MASK;
>>> +	*out_temp = translate_temp(val);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static const struct of_device_id tegra_soctherm_of_match[] = {
>>> +	{ .compatible = "nvidia,tegra124-soctherm" },
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, tegra_soctherm_of_match);
>>> +
>>> +struct thermctl_zone_desc {
>>> +	unsigned int offset;
>>> +	unsigned int shift;
>>> +};
>>> +
>>> +static const struct thermctl_zone_desc t124_thermctl_temp_zones[] = {
>>> +	{ SENSOR_TEMP1, 16 },
>>> +	{ SENSOR_TEMP2, 16 },
>>> +	{ SENSOR_TEMP1, 0 },
>>> +	{ SENSOR_TEMP2, 0 }
>>> +};
>>> +
>>> +static int tegra_soctherm_probe(struct platform_device *pdev)
>>> +{
>>> +	struct tegra_soctherm *tegra;
>>> +	struct thermal_zone_device *tz;
>>> +	struct tsensor_shared_calibration shared_calib;
>>> +	struct resource *res;
>>> +	unsigned int i;
>>> +	int err;
>>> +
>>> +	const struct tegra_tsensor *tsensors = t124_tsensors;
>>> +
>>> +	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
>>> +	if (!tegra)
>>> +		return -ENOMEM;
>>> +
>>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +	tegra->regs = devm_ioremap_resource(&pdev->dev, res);
>>> +	if (IS_ERR(tegra->regs))
>>> +		return PTR_ERR(tegra->regs);
>>> +
>>> +	tegra->reset = devm_reset_control_get(&pdev->dev, "soctherm");
>>> +	if (IS_ERR(tegra->reset)) {
>>> +		dev_err(&pdev->dev, "can't get soctherm reset\n");
>>> +		return PTR_ERR(tegra->reset);
>>> +	}
>>> +
>>> +	tegra->clock_tsensor = devm_clk_get(&pdev->dev, "tsensor");
>>> +	if (IS_ERR(tegra->clock_tsensor)) {
>>> +		dev_err(&pdev->dev, "can't get tsensor clock\n");
>>> +		return PTR_ERR(tegra->clock_tsensor);
>>> +	}
>>> +
>>> +	tegra->clock_soctherm = devm_clk_get(&pdev->dev, "soctherm");
>>> +	if (IS_ERR(tegra->clock_soctherm)) {
>>> +		dev_err(&pdev->dev, "can't get soctherm clock\n");
>>> +		return PTR_ERR(tegra->clock_soctherm);
>>> +	}
>>> +
>>> +	reset_control_assert(tegra->reset);
>>> +
>>> +	err = clk_prepare_enable(tegra->clock_soctherm);
>>> +	if (err)
>>> +		return err;
>>> +
>>> +	err = clk_prepare_enable(tegra->clock_tsensor);
>>> +	if (err) {
>>> +		clk_disable_unprepare(tegra->clock_soctherm);
>>> +		return err;
>>> +	}
>>> +
>>> +	reset_control_deassert(tegra->reset);
>>> +
>>> +	/* Initialize raw sensors */
>>> +
>>> +	err = calculate_shared_calibration(&shared_calib);
>>> +	if (err)
>>> +		goto disable_clocks;
>>> +
>>> +	for (i = 0; i < ARRAY_SIZE(t124_tsensors); ++i) {
>>> +		err = enable_tsensor(tegra, tsensors + i, &shared_calib);
>>> +		if (err)
>>> +			goto disable_clocks;
>>> +	}
>>> +
>>> +	writel(SENSOR_PDIV_T124, tegra->regs + SENSOR_PDIV);
>>> +	writel(SENSOR_HOTSPOT_OFF_T124, tegra->regs + SENSOR_HOTSPOT_OFF);
>>> +
>>> +	/* Initialize thermctl sensors */
>>> +
>>> +	for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
>>> +		struct tegra_thermctl_zone *zone =
>>> +			devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
>>> +		if (!zone) {
>>> +			err = -ENOMEM;
>>> +			goto unregister_tzs;
>>> +		}
>>> +
>>> +		zone->reg = tegra->regs + t124_thermctl_temp_zones[i].offset;
>>> +		zone->shift = t124_thermctl_temp_zones[i].shift;
>>> +
>>> +		tz = thermal_zone_of_sensor_register(&pdev->dev, i, zone,
>>> +						     tegra_thermctl_get_temp,
>>> +						     NULL);
>>> +		if (IS_ERR(tz)) {
>>> +			err = PTR_ERR(tz);
>>> +			dev_err(&pdev->dev, "failed to register sensor: %d\n",
>>> +				err);
>>> +			goto unregister_tzs;
>>> +		}
>>> +
>>> +		tegra->thermctl_tzs[i] = tz;
>>> +	}
>>> +
>>> +	return 0;
>>> +
>>> +unregister_tzs:
>>> +	while (i--)
>>> +		thermal_zone_of_sensor_unregister(&pdev->dev,
>>> +						  tegra->thermctl_tzs[i]);
>>> +
>>> +disable_clocks:
>>> +	clk_disable_unprepare(tegra->clock_tsensor);
>>> +	clk_disable_unprepare(tegra->clock_soctherm);
>>> +
>>> +	return err;
>>> +}
>>> +
>>> +static int tegra_soctherm_remove(struct platform_device *pdev)
>>> +{
>>> +	struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
>>> +	unsigned int i;
>>> +
>>> +	for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
>>> +		thermal_zone_of_sensor_unregister(&pdev->dev,
>>> +						  tegra->thermctl_tzs[i]);
>>> +	}
>>> +
>>> +	clk_disable_unprepare(tegra->clock_tsensor);
>>> +	clk_disable_unprepare(tegra->clock_soctherm);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static struct platform_driver tegra_soctherm_driver = {
>>> +	.probe = tegra_soctherm_probe,
>>> +	.remove = tegra_soctherm_remove,
>>> +	.driver = {
>>> +		.name = "tegra-soctherm",
>>> +		.of_match_table = tegra_soctherm_of_match,
>>> +	},
>>> +};
>>> +module_platform_driver(tegra_soctherm_driver);
>>> +
>>> +MODULE_AUTHOR("Mikko Perttunen <[email-masked]>");
>>> +MODULE_DESCRIPTION("NVIDIA Tegra SOCTHERM thermal management driver");
>>> +MODULE_LICENSE("GPL v2");
>>>
>>