Message-Id: <1436783694-30717-3-git-send-email-s.hauer@pengutronix.de>
Date:	Mon, 13 Jul 2015 12:34:53 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	linux-pm@...r.kernel.org
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 2/3] thermal: Add Mediatek thermal controller support

This adds support for the Mediatek thermal controller found on MT8173
and likely other SoCs.
The controller is a bit special. It does not have its own ADC, instead
it controls the on-SoC AUXADC via AHB bus accesses. For this reason
we need the physical address of the AUXADC. Also it controls a mux
using AHB bus accesses, so we need the APMIXEDSYS physical address aswell.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/thermal/Kconfig       |   8 +
 drivers/thermal/Makefile      |   1 +
 drivers/thermal/mtk_thermal.c | 602 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 611 insertions(+)
 create mode 100644 drivers/thermal/mtk_thermal.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 118938e..07ad114 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -340,6 +340,14 @@ config ACPI_THERMAL_REL
 	tristate
 	depends on ACPI
 
+config MTK_THERMAL
+	tristate "Temperature sensor driver for mediatek SoCs"
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	default y
+	help
+	  Enable this option if you want to have support for thermal management
+	  controller present in Mediatek SoCs
+
 menu "Texas Instruments thermal drivers"
 source "drivers/thermal/ti-soc-thermal/Kconfig"
 endmenu
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 535dfee..cc1cab3 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -44,3 +44,4 @@ obj-$(CONFIG_INT340X_THERMAL)  += int340x_thermal/
 obj-$(CONFIG_ST_THERMAL)	+= st/
 obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
 obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
+obj-$(CONFIG_MTK_THERMAL)	+= mtk_thermal.o
diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
new file mode 100644
index 0000000..538e438
--- /dev/null
+++ b/drivers/thermal/mtk_thermal.c
@@ -0,0 +1,602 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Hanyi.Wu <hanyi.wu@...iatek.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 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/kernel.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/thermal.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/time.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/reset.h>
+
+/* AUXADC Registers */
+#define AUXADC_CON0_V		0x000
+#define AUXADC_CON1_V		0x004
+#define AUXADC_CON1_SET_V	0x008
+#define AUXADC_CON1_CLR_V	0x00c
+#define AUXADC_CON2_V		0x010
+#define AUXADC_DATA(channel)	(0x14 + (channel) * 4)
+#define AUXADC_MISC_V		0x094
+
+#define AUXADC_CON1_CHANNEL(x)	(1 << (x))
+
+/* Thermal Controller Registers */
+#define TEMPMONCTL0		0x000
+#define TEMPMONCTL1		0x004
+#define TEMPMONCTL2		0x008
+#define TEMPMONINT		0x00c
+#define TEMPMONINTSTS		0x010
+#define TEMPMONIDET0		0x014
+#define TEMPMONIDET1		0x018
+#define TEMPMONIDET2		0x01c
+#define TEMPH2NTHRE		0x024
+#define TEMPHTHRE		0x028
+#define TEMPCTHRE		0x02c
+#define TEMPOFFSETH		0x030
+#define TEMPOFFSETL		0x034
+#define TEMPMSRCTL0		0x038
+#define TEMPMSRCTL1		0x03c
+#define TEMPAHBPOLL		0x040
+#define TEMPAHBTO		0x044
+#define TEMPADCPNP0		0x048
+#define TEMPADCPNP1		0x04c
+#define TEMPADCPNP2		0x050
+#define TEMPADCPNP3		0x0b4
+
+#define TEMPADCMUX		0x054
+#define TEMPADCEXT		0x058
+#define TEMPADCEXT1		0x05c
+#define TEMPADCEN		0x060
+#define TEMPPNPMUXADDR		0x064
+#define TEMPADCMUXADDR		0x068
+#define TEMPADCEXTADDR		0x06c
+#define TEMPADCEXT1ADDR		0x070
+#define TEMPADCENADDR		0x074
+#define TEMPADCVALIDADDR	0x078
+#define TEMPADCVOLTADDR		0x07c
+#define TEMPRDCTRL		0x080
+#define TEMPADCVALIDMASK	0x084
+#define TEMPADCVOLTAGESHIFT	0x088
+#define TEMPADCWRITECTRL	0x08c
+#define TEMPMSR0		0x090
+#define TEMPMSR1		0x094
+#define TEMPMSR2		0x098
+#define TEMPMSR3		0x0B8
+
+#define TEMPIMMD0		0x0a0
+#define TEMPIMMD1		0x0a4
+#define TEMPIMMD2		0x0a8
+
+#define TEMPPROTCTL		0x0c0
+#define TEMPPROTTA		0x0c4
+#define TEMPPROTTB		0x0c8
+#define TEMPPROTTC		0x0cc
+
+#define TEMPSPARE0		0x0f0
+#define TEMPSPARE1		0x0f4
+#define TEMPSPARE2		0x0f8
+#define TEMPSPARE3		0x0fc
+
+#define PTPCORESEL		0x400
+#define THERMINTST		0x404
+#define PTPODINTST		0x408
+#define THSTAGE0ST		0x40c
+#define THSTAGE1ST		0x410
+#define THSTAGE2ST		0x414
+#define THAHBST0		0x418
+#define THAHBST1		0x41c	/* Only for DE debug */
+#define PTPSPARE0		0x420
+#define PTPSPARE1		0x424
+#define PTPSPARE2		0x428
+#define PTPSPARE3		0x42c
+#define THSLPEVEB		0x430
+
+#define TEMPMONINT_COLD(sp)			((1 << 0) << ((sp) * 5))
+#define TEMPMONINT_HOT(sp)			((1 << 1) << ((sp) * 5))
+#define TEMPMONINT_LOW_OFS(sp)			((1 << 2) << ((sp) * 5))
+#define TEMPMONINT_HIGH_OFS(sp)			((1 << 3) << ((sp) * 5))
+#define TEMPMONINT_HOT_TO_NORM(sp)		((1 << 4) << ((sp) * 5))
+#define TEMPMONINT_TIMEOUT			(1 << 15)
+#define TEMPMONINT_IMMEDIATE_SENSE(sp)		(1 << (16 + (sp)))
+#define TEMPMONINT_FILTER_SENSE(sp)		(1 << (19 + (sp)))
+
+#define TEMPADCWRITECTRL_ADC_PNP_WRITE		(1 << 0)
+#define TEMPADCWRITECTRL_ADC_MUX_WRITE		(1 << 1)
+#define TEMPADCWRITECTRL_ADC_EXTRA_WRITE	(1 << 2)
+#define TEMPADCWRITECTRL_ADC_EXTRA1_WRITE	(1 << 3)
+
+#define TEMPADCVALIDMASK_VALID_HIGH		(1 << 5)
+#define TEMPADCVALIDMASK_VALID_POS(bit)		(bit)
+
+#define TEMPPROTCTL_AVERAGE			(0 << 16)
+#define TEMPPROTCTL_MAXIMUM			(1 << 16)
+#define TEMPPROTCTL_SELECTED			(2 << 16)
+
+#define MT8173_THERMAL_ZONE_CA57		0
+#define MT8173_THERMAL_ZONE_CA53		1
+#define MT8173_THERMAL_ZONE_GPU			2
+#define MT8173_THERMAL_ZONE_CORE		3
+
+#define MT8173_TS1	0
+#define MT8173_TS2	1
+#define MT8173_TS3	2
+#define MT8173_TS4	3
+#define MT8173_TSABB	4
+
+/* AUXADC channel 11 is used for the temperature sensors */
+#define MT8173_TEMP_AUXADC_CHANNEL	11
+
+/* The total number of temperature sensors in the MT8173 */
+#define MT8173_NUM_SENSORS		5
+
+/* The number of banks in the MT8173 */
+#define MT8173_NUM_BANKS		4
+
+/* The number of sensing points per bank */
+#define MT8173_NUM_SENSING_POINTS	4
+
+#define THERMAL_NAME    "mtk-thermal"
+
+struct mtk_thermal;
+
+struct mtk_thermal_bank {
+	struct mtk_thermal *mt;
+	struct thermal_zone_device *tz;
+	int id;
+};
+
+struct mtk_thermal {
+	struct device *dev;
+	void __iomem *thermal_base;
+	void __iomem *auxadc_base;
+
+	u64 auxadc_phys_base;
+	u64 apmixed_phys_base;
+	struct reset_control *reset;
+	struct clk *clk_peri_therm;
+	struct clk *clk_auxadc;
+
+	struct mtk_thermal_bank banks[MT8173_NUM_BANKS];
+
+	struct mutex lock;
+
+	/* Calibration values */
+	s32 adc_ge;
+	s32 adc_oe;
+	s32 degc_cali;
+	s32 o_slope;
+	s32 vts;
+};
+
+struct mtk_thermal_bank_cfg {
+	unsigned int enable_mask;
+	unsigned int sensors[4];
+};
+
+static int sensor_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 };
+
+/*
+ * The MT8173 thermal controller has four banks. Each bank can read up to
+ * four temperature sensors simultaneously. The MT8173 has a total of 5
+ * temperature sensors. We use each bank to measure a certain area of the
+ * SoC. Since TS2 is located centrally in the SoC it is influenced by multiple
+ * areas, hence is used in different banks.
+ */
+static struct mtk_thermal_bank_cfg bank_data[] = {
+	{
+		.enable_mask = 3,
+		.sensors = { MT8173_TS2, MT8173_TS3 },
+	}, {
+		.enable_mask = 3,
+		.sensors = { MT8173_TS2, MT8173_TS4 },
+	}, {
+		.enable_mask = 7,
+		.sensors = { MT8173_TS1, MT8173_TS2, MT8173_TSABB },
+	}, {
+		.enable_mask = 1,
+		.sensors = { MT8173_TS2 },
+	},
+};
+
+static int tempmsr_ofs[MT8173_NUM_SENSING_POINTS] = {
+	TEMPMSR0, TEMPMSR1, TEMPMSR2, TEMPMSR3
+};
+
+static int tempadcpnp_ofs[MT8173_NUM_SENSING_POINTS] = {
+	TEMPADCPNP0, TEMPADCPNP1, TEMPADCPNP2, TEMPADCPNP3
+};
+
+/**
+ * raw_to_mcelsius - convert a raw ADC value to mcelsius
+ * @mt:		The thermal controller
+ * @raw:	raw ADC value
+ *
+ * This converts the raw ADC value to mcelsius using the SoC specific
+ * calibration constants
+ */
+static int raw_to_mcelsius(struct mtk_thermal *mt, u32 raw)
+{
+	s32 format_1, format_2, format_3, format_4;
+	s32 xtoomt;
+	s32 gain;
+
+	raw &= 0xfff;
+
+	gain = (10000 + mt->adc_ge);
+
+	xtoomt = ((((mt->vts + 3350 - mt->adc_oe) * 10000) / 4096) * 10000) /
+		gain;
+
+	format_1 = ((mt->degc_cali * 10) >> 1);
+	format_2 = (raw - mt->adc_oe);
+	format_3 = (((((format_2) * 10000) >> 12) * 10000) / gain) - xtoomt;
+	format_3 = format_3 * 15 / 18;
+	format_4 = ((format_3 * 100) / (165 + mt->o_slope));
+	format_4 = format_4 - (format_4 << 1);
+
+	return (format_1 + format_4) * 100;
+}
+
+/**
+ * mtk_thermal_get_bank - get bank
+ * @bank:	The bank
+ *
+ * The bank registers are banked, we have to select a bank in the
+ * PTPCORESEL register to access it.
+ */
+static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank)
+{
+	struct mtk_thermal *mt = bank->mt;
+	u32 val;
+
+	mutex_lock(&mt->lock);
+
+	val = readl(mt->thermal_base + PTPCORESEL);
+	val &= ~0xf;
+	val |= bank->id;
+	writel(val, mt->thermal_base + PTPCORESEL);
+}
+
+/**
+ * mtk_thermal_put_bank - release bank
+ * @bank:	The bank
+ *
+ * release a bank previously taken with mtk_thermal_get_bank,
+ */
+static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
+{
+	struct mtk_thermal *mt = bank->mt;
+
+	mutex_unlock(&mt->lock);
+}
+
+/**
+ * mtk_thermal_bank_temperature - get the temperature of a bank
+ * @bank:	The bank
+ *
+ * The temperature of a bank is considered the maximum temperature of
+ * the sensors associated to the bank.
+ */
+static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
+{
+	struct mtk_thermal *mt = bank->mt;
+	int temp, i, max;
+	u32 raw;
+
+	temp = max = -INT_MAX;
+
+	for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++) {
+		int sensno;
+
+		if (!(bank_data[bank->id].enable_mask & (1 << i)))
+			continue;
+
+		raw = readl(mt->thermal_base + tempmsr_ofs[i]);
+
+		sensno = bank_data[bank->id].sensors[i];
+		temp = raw_to_mcelsius(mt, raw);
+
+		if (temp > max)
+			max = temp;
+	}
+
+	return max;
+}
+
+static int mtk_read_temp(void *data, int *temp)
+{
+	struct mtk_thermal_bank *bank = data;
+
+	mtk_thermal_get_bank(bank);
+
+	*temp = mtk_thermal_bank_temperature(bank);
+
+	/*
+	 * The first read of a sensor often contains very high bogus temperature
+	 * value. Filter these out so that the system does not immediately shut
+	 * down.
+	 */
+	if (*temp > 200000)
+		*temp = 0;
+
+	mtk_thermal_put_bank(bank);
+
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops mtk_thermal_ops = {
+	.get_temp = mtk_read_temp,
+};
+
+static void mtk_thermal_init_bank(struct mtk_thermal_bank *bank)
+{
+	struct mtk_thermal *mt = bank->mt;
+	struct mtk_thermal_bank_cfg *cfg = &bank_data[bank->id];
+	int i;
+
+	mtk_thermal_get_bank(bank);
+
+	/* bus clock 66M counting unit is 12 * 15.15ns * 256 = 46.540us */
+	writel(0x0000000c, mt->thermal_base + TEMPMONCTL1);
+
+	/*
+	 * filt interval is 1 * 46.540us = 46.54us,
+	 * sen interval is 429 * 46.540us = 19.96ms
+	 */
+	writel(0x000101ad, mt->thermal_base + TEMPMONCTL2);
+
+	/* poll is set to 10u */
+	writel(0x00000300, mt->thermal_base + TEMPAHBPOLL);
+
+	/* temperature sampling control, 1 sample */
+	writel(0x00000000, mt->thermal_base + TEMPMSRCTL0);
+
+	/* exceed this polling time, IRQ would be inserted */
+	writel(0xffffffff, mt->thermal_base + TEMPAHBTO);
+
+	/* number of interrupts per event, 1 is enough */
+	writel(0x0, mt->thermal_base + TEMPMONIDET0);
+	writel(0x0, mt->thermal_base + TEMPMONIDET1);
+
+	/*
+	 * The MT8173 thermal controller does not have its own ADC. Instead it
+	 * uses AHB bus accesses to control the AUXADC. To do this the thermal
+	 * controller has to be programmed with the physical addresses of the
+	 * AUXADC registers and with the various bit positions in the AUXADC.
+	 * Also the thermal controller controls a mux in the APMIXEDSYS register
+	 * space.
+	 */
+
+	/*
+	 * this value will be stored to TEMPPNPMUXADDR (TEMPSPARE0)
+	 * automatically by hw
+	 */
+	writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCMUX);
+
+	/* AHB address for auxadc mux selection */
+	writel(mt->auxadc_phys_base + 0x00c,
+			mt->thermal_base + TEMPADCMUXADDR);
+
+	/* AHB address for pnp sensor mux selection */
+	writel(mt->apmixed_phys_base + 0x0604,
+			mt->thermal_base + TEMPPNPMUXADDR);
+
+	/* AHB value for auxadc enable */
+	writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCEN);
+
+	/* AHB address for auxadc enable (channel 0 immediate mode selected) */
+	writel(mt->auxadc_phys_base + AUXADC_CON1_SET_V,
+			mt->thermal_base + TEMPADCENADDR);
+
+	/* AHB address for auxadc valid bit */
+	writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
+			mt->thermal_base + TEMPADCVALIDADDR);
+
+	/* AHB address for auxadc voltage output */
+	writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
+			mt->thermal_base + TEMPADCVOLTADDR);
+
+	/* read valid & voltage are at the same register */
+	writel(0x0, mt->thermal_base + TEMPRDCTRL);
+
+	/* indicate where the valid bit is */
+	writel(TEMPADCVALIDMASK_VALID_HIGH | TEMPADCVALIDMASK_VALID_POS(12),
+			mt->thermal_base + TEMPADCVALIDMASK);
+
+	/* no shift */
+	writel(0x0, mt->thermal_base + TEMPADCVOLTAGESHIFT);
+
+	/* enable auxadc mux write transaction */
+	writel(TEMPADCWRITECTRL_ADC_MUX_WRITE,
+			mt->thermal_base + TEMPADCWRITECTRL);
+
+	for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++)
+		writel(sensor_mux_values[cfg->sensors[i]],
+				mt->thermal_base + tempadcpnp_ofs[i]);
+
+	writel(cfg->enable_mask, mt->thermal_base + TEMPMONCTL0);
+
+	writel(TEMPADCWRITECTRL_ADC_PNP_WRITE | TEMPADCWRITECTRL_ADC_MUX_WRITE,
+			mt->thermal_base + TEMPADCWRITECTRL);
+
+	mtk_thermal_put_bank(bank);
+}
+
+static u64 of_get_phys_base(struct device_node *np)
+{
+	u64 size64;
+	const __be32 *regaddr_p;
+
+	regaddr_p = of_get_address(np, 0, &size64, NULL);
+	if (!regaddr_p)
+		return OF_BAD_ADDR;
+
+	return of_translate_address(np, regaddr_p);
+}
+
+static int mtk_thermal_probe(struct platform_device *pdev)
+{
+	int ret, i;
+	struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node;
+	struct mtk_thermal *mt;
+	struct resource *res;
+
+	mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL);
+	if (!mt)
+		return -ENOMEM;
+
+	mt->clk_peri_therm = devm_clk_get(&pdev->dev, "therm");
+	if (IS_ERR(mt->clk_peri_therm))
+		return PTR_ERR(mt->clk_peri_therm);
+
+	mt->clk_auxadc = devm_clk_get(&pdev->dev, "auxadc");
+	if (IS_ERR(mt->clk_auxadc))
+		return PTR_ERR(mt->clk_auxadc);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mt->thermal_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mt->thermal_base))
+		return PTR_ERR(mt->thermal_base);
+
+	mt->reset = devm_reset_control_get(&pdev->dev, "therm");
+	if (IS_ERR(mt->reset)) {
+		ret = PTR_ERR(mt->reset);
+		dev_err(&pdev->dev, "cannot get reset: %d\n", ret);
+		return ret;
+	}
+
+	mutex_init(&mt->lock);
+
+	mt->dev = &pdev->dev;
+
+	auxadc = of_parse_phandle(np, "auxadc", 0);
+	if (!auxadc) {
+		dev_err(&pdev->dev, "missing auxadc node\n");
+		return -ENODEV;
+	}
+
+	mt->auxadc_phys_base = of_get_phys_base(auxadc);
+	if (mt->auxadc_phys_base == OF_BAD_ADDR) {
+		dev_err(&pdev->dev, "Can't get auxadc phys address\n");
+		return -EINVAL;
+	}
+
+	apmixedsys = of_parse_phandle(np, "apmixedsys", 0);
+	if (!apmixedsys) {
+		dev_err(&pdev->dev, "missing apmixedsys node\n");
+		return -ENODEV;
+	}
+
+	mt->apmixed_phys_base = of_get_phys_base(apmixedsys);
+	if (mt->apmixed_phys_base == OF_BAD_ADDR) {
+		dev_err(&pdev->dev, "Can't get auxadc phys address\n");
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(mt->clk_auxadc);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
+		return ret;
+	}
+
+	reset_control_reset(mt->reset);
+
+	ret = clk_prepare_enable(mt->clk_peri_therm);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
+		goto err_enable_clk;
+	}
+
+	/*
+	 * These calibration values should finally be provided by the
+	 * firmware or fuses. For now use default values.
+	 */
+	mt->adc_ge = ((512 - 512) * 10000) / 4096;
+	mt->adc_oe = 512 - 512;
+	mt->degc_cali = 40;
+	mt->o_slope = 0;
+	mt->vts = 260;
+
+	for (i = 0; i < MT8173_NUM_BANKS; i++) {
+		struct mtk_thermal_bank *bank = &mt->banks[i];
+
+		bank->id = i;
+		bank->mt = mt;
+		mtk_thermal_init_bank(&mt->banks[i]);
+	}
+
+	platform_set_drvdata(pdev, mt);
+
+	for (i = 0; i < MT8173_NUM_BANKS; i++) {
+		struct mtk_thermal_bank *bank = &mt->banks[i];
+
+		bank->tz = thermal_zone_of_sensor_register(&pdev->dev, i, bank,
+				&mtk_thermal_ops);
+	}
+
+	return 0;
+
+err_enable_clk:
+	clk_disable_unprepare(mt->clk_peri_therm);
+
+	return ret;
+}
+
+static int mtk_thermal_remove(struct platform_device *pdev)
+{
+	struct mtk_thermal *mt = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < MT8173_NUM_BANKS; i++) {
+		struct mtk_thermal_bank *bank = &mt->banks[i];
+
+		if (!IS_ERR(bank))
+			thermal_zone_of_sensor_unregister(&pdev->dev, bank->tz);
+	}
+
+	clk_disable_unprepare(mt->clk_peri_therm);
+	clk_disable_unprepare(mt->clk_auxadc);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_thermal_of_match[] = {
+	{
+		.compatible = "mediatek,mt8173-thermal",
+	}, {
+	},
+};
+
+static struct platform_driver mtk_thermal_driver = {
+	.probe = mtk_thermal_probe,
+	.remove = mtk_thermal_remove,
+	.driver = {
+		.name = THERMAL_NAME,
+		.of_match_table = mtk_thermal_of_match,
+	},
+};
+
+module_platform_driver(mtk_thermal_driver);
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@...gutronix.de");
+MODULE_DESCRIPTION("Mediatek thermal driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.4

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