kernel: backport Broadcom thermal drivers

This includes driver for Northstar and for Raspberry Pi.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

5 files changed, 801 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.4/086-0001-thermal-of-thermal-Add-devm-version-of-thermal_zone_.patch b/target/linux/generic/patches-4.4/086-0001-thermal-of-thermal-Add-devm-version-of-thermal_zone_.patch
new file mode 100644
index 0000000..b551bac
--- /dev/null
+++ b/target/linux/generic/patches-4.4/086-0001-thermal-of-thermal-Add-devm-version-of-thermal_zone_.patch
@@ -0,0 +1,143 @@
+From e498b4984db82b4ba3ceea7dba813222a31e9c2e Mon Sep 17 00:00:00 2001
+From: Laxman Dewangan <ldewangan@nvidia.com>
+Date: Wed, 9 Mar 2016 18:40:06 +0530
+Subject: [PATCH] thermal: of-thermal: Add devm version of
+ thermal_zone_of_sensor_register
+
+Add resource managed version of thermal_zone_of_sensor_register() and
+thermal_zone_of_sensor_unregister().
+
+This helps in reducing the code size in error path, remove of
+driver remove callbacks and making proper sequence for deallocations.
+
+Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
+Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
+---
+ drivers/thermal/of-thermal.c | 81 ++++++++++++++++++++++++++++++++++++++++++++
+ include/linux/thermal.h      | 18 ++++++++++
+ 2 files changed, 99 insertions(+)
+
+--- a/drivers/thermal/of-thermal.c
++++ b/drivers/thermal/of-thermal.c
+@@ -559,6 +559,87 @@ void thermal_zone_of_sensor_unregister(s
+ }
+ EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
+ 
++static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
++{
++	thermal_zone_of_sensor_unregister(dev,
++					  *(struct thermal_zone_device **)res);
++}
++
++static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
++					     void *data)
++{
++	struct thermal_zone_device **r = res;
++
++	if (WARN_ON(!r || !*r))
++		return 0;
++
++	return *r == data;
++}
++
++/**
++ * devm_thermal_zone_of_sensor_register - Resource managed version of
++ *				thermal_zone_of_sensor_register()
++ * @dev: a valid struct device pointer of a sensor device. Must contain
++ *       a valid .of_node, for the sensor node.
++ * @sensor_id: a sensor identifier, in case the sensor IP has more
++ *	       than one sensors
++ * @data: a private pointer (owned by the caller) that will be passed
++ *	  back, when a temperature reading is needed.
++ * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
++ *
++ * Refer thermal_zone_of_sensor_register() for more details.
++ *
++ * Return: On success returns a valid struct thermal_zone_device,
++ * otherwise, it returns a corresponding ERR_PTR(). Caller must
++ * check the return value with help of IS_ERR() helper.
++ * Registered hermal_zone_device device will automatically be
++ * released when device is unbounded.
++ */
++struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
++	struct device *dev, int sensor_id,
++	void *data, const struct thermal_zone_of_device_ops *ops)
++{
++	struct thermal_zone_device **ptr, *tzd;
++
++	ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
++			   GFP_KERNEL);
++	if (!ptr)
++		return ERR_PTR(-ENOMEM);
++
++	tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
++	if (IS_ERR(tzd)) {
++		devres_free(ptr);
++		return tzd;
++	}
++
++	*ptr = tzd;
++	devres_add(dev, ptr);
++
++	return tzd;
++}
++EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
++
++/**
++ * devm_thermal_zone_of_sensor_unregister - Resource managed version of
++ *				thermal_zone_of_sensor_unregister().
++ * @dev: Device for which which resource was allocated.
++ * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
++ *
++ * This function removes the sensor callbacks and private data from the
++ * thermal zone device registered with devm_thermal_zone_of_sensor_register()
++ * API. It will also silent the zone by remove the .get_temp() and .get_trend()
++ * thermal zone device callbacks.
++ * Normally this function will not need to be called and the resource
++ * management code will ensure that the resource is freed.
++ */
++void devm_thermal_zone_of_sensor_unregister(struct device *dev,
++					    struct thermal_zone_device *tzd)
++{
++	WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
++			       devm_thermal_zone_of_sensor_match, tzd));
++}
++EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
++
+ /***   functions parsing device tree nodes   ***/
+ 
+ /**
+--- a/include/linux/thermal.h
++++ b/include/linux/thermal.h
+@@ -364,6 +364,11 @@ thermal_zone_of_sensor_register(struct d
+ 				const struct thermal_zone_of_device_ops *ops);
+ void thermal_zone_of_sensor_unregister(struct device *dev,
+ 				       struct thermal_zone_device *tz);
++struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
++		struct device *dev, int id, void *data,
++		const struct thermal_zone_of_device_ops *ops);
++void devm_thermal_zone_of_sensor_unregister(struct device *dev,
++					    struct thermal_zone_device *tz);
+ #else
+ static inline struct thermal_zone_device *
+ thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
+@@ -378,6 +383,19 @@ void thermal_zone_of_sensor_unregister(s
+ {
+ }
+ 
++static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
++		struct device *dev, int id, void *data,
++		const struct thermal_zone_of_device_ops *ops)
++{
++	return ERR_PTR(-ENODEV);
++}
++
++static inline
++void devm_thermal_zone_of_sensor_unregister(struct device *dev,
++					    struct thermal_zone_device *tz)
++{
++}
++
+ #endif
+ 
+ #if IS_ENABLED(CONFIG_THERMAL)
diff --git a/target/linux/generic/patches-4.4/086-0002-thermal-core-export-apis-to-get-slope-and-offset.patch b/target/linux/generic/patches-4.4/086-0002-thermal-core-export-apis-to-get-slope-and-offset.patch
new file mode 100644
index 0000000..3fbe5f5
--- /dev/null
+++ b/target/linux/generic/patches-4.4/086-0002-thermal-core-export-apis-to-get-slope-and-offset.patch
@@ -0,0 +1,101 @@
+From 4a7069a32c99a81950de035535b0a064dcceaeba Mon Sep 17 00:00:00 2001
+From: Rajendra Nayak <rnayak@codeaurora.org>
+Date: Thu, 5 May 2016 14:21:42 +0530
+Subject: [PATCH] thermal: core: export apis to get slope and offset
+
+Add apis for platform thermal drivers to query for slope and offset
+attributes, which might be needed for temperature calculations.
+
+Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
+Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
+Signed-off-by: Zhang Rui <rui.zhang@intel.com>
+---
+ Documentation/thermal/sysfs-api.txt | 12 ++++++++++++
+ drivers/thermal/thermal_core.c      | 30 ++++++++++++++++++++++++++++++
+ include/linux/thermal.h             |  8 ++++++++
+ 3 files changed, 50 insertions(+)
+
+--- a/Documentation/thermal/sysfs-api.txt
++++ b/Documentation/thermal/sysfs-api.txt
+@@ -72,6 +72,18 @@ temperature) and throttle appropriate de
+     It deletes the corresponding entry form /sys/class/thermal folder and
+     unbind all the thermal cooling devices it uses.
+ 
++1.1.7 int thermal_zone_get_slope(struct thermal_zone_device *tz)
++
++	This interface is used to read the slope attribute value
++	for the thermal zone device, which might be useful for platform
++	drivers for temperature calculations.
++
++1.1.8 int thermal_zone_get_offset(struct thermal_zone_device *tz)
++
++	This interface is used to read the offset attribute value
++	for the thermal zone device, which might be useful for platform
++	drivers for temperature calculations.
++
+ 1.2 thermal cooling device interface
+ 1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
+ 		void *devdata, struct thermal_cooling_device_ops *)
+--- a/drivers/thermal/thermal_core.c
++++ b/drivers/thermal/thermal_core.c
+@@ -2061,6 +2061,36 @@ exit:
+ }
+ EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
+ 
++/**
++ * thermal_zone_get_slope - return the slope attribute of the thermal zone
++ * @tz: thermal zone device with the slope attribute
++ *
++ * Return: If the thermal zone device has a slope attribute, return it, else
++ * return 1.
++ */
++int thermal_zone_get_slope(struct thermal_zone_device *tz)
++{
++	if (tz && tz->tzp)
++		return tz->tzp->slope;
++	return 1;
++}
++EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
++
++/**
++ * thermal_zone_get_offset - return the offset attribute of the thermal zone
++ * @tz: thermal zone device with the offset attribute
++ *
++ * Return: If the thermal zone device has a offset attribute, return it, else
++ * return 0.
++ */
++int thermal_zone_get_offset(struct thermal_zone_device *tz)
++{
++	if (tz && tz->tzp)
++		return tz->tzp->offset;
++	return 0;
++}
++EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
++
+ #ifdef CONFIG_NET
+ static const struct genl_multicast_group thermal_event_mcgrps[] = {
+ 	{ .name = THERMAL_GENL_MCAST_GROUP_NAME, },
+--- a/include/linux/thermal.h
++++ b/include/linux/thermal.h
+@@ -432,6 +432,8 @@ thermal_of_cooling_device_register(struc
+ void thermal_cooling_device_unregister(struct thermal_cooling_device *);
+ struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
+ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
++int thermal_zone_get_slope(struct thermal_zone_device *tz);
++int thermal_zone_get_offset(struct thermal_zone_device *tz);
+ 
+ int get_tz_trend(struct thermal_zone_device *, int);
+ struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
+@@ -489,6 +491,12 @@ static inline struct thermal_zone_device
+ static inline int thermal_zone_get_temp(
+ 		struct thermal_zone_device *tz, int *temp)
+ { return -ENODEV; }
++static inline int thermal_zone_get_slope(
++		struct thermal_zone_device *tz)
++{ return -ENODEV; }
++static inline int thermal_zone_get_offset(
++		struct thermal_zone_device *tz)
++{ return -ENODEV; }
+ static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
+ { return -ENODEV; }
+ static inline struct thermal_instance *
diff --git a/target/linux/generic/patches-4.4/086-0003-thermal-bcm2835-add-thermal-driver-for-bcm2835-SoC.patch b/target/linux/generic/patches-4.4/086-0003-thermal-bcm2835-add-thermal-driver-for-bcm2835-SoC.patch
new file mode 100644
index 0000000..d606804
--- /dev/null
+++ b/target/linux/generic/patches-4.4/086-0003-thermal-bcm2835-add-thermal-driver-for-bcm2835-SoC.patch
@@ -0,0 +1,365 @@
+From bcb7dd9ef206f7d646ed8dac6fe7772083714253 Mon Sep 17 00:00:00 2001
+From: Stefan Wahren <stefan.wahren@i2se.com>
+Date: Fri, 31 Mar 2017 20:03:06 +0000
+Subject: [PATCH] thermal: bcm2835: add thermal driver for bcm2835 SoC
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Add basic thermal driver for bcm2835 SoC.
+
+This driver currently make sure that tsense HW block is set up
+correctly.
+
+Tested-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
+Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
+Acked-by: Eric Anholt <eric@anholt.net>
+Acked-by: Eduardo Valentin <edubezval@gmail.com>
+Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
+---
+ drivers/thermal/Kconfig           |   8 +
+ drivers/thermal/Makefile          |   1 +
+ drivers/thermal/bcm2835_thermal.c | 314 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 323 insertions(+)
+ create mode 100644 drivers/thermal/bcm2835_thermal.c
+
+--- a/drivers/thermal/Kconfig
++++ b/drivers/thermal/Kconfig
+@@ -391,4 +391,12 @@ config QCOM_SPMI_TEMP_ALARM
+ 	  real time die temperature if an ADC is present or an estimate of the
+ 	  temperature based upon the over temperature stage value.
+ 
++config BCM2835_THERMAL
++	tristate "Thermal sensors on bcm2835 SoC"
++	depends on ARCH_BCM2835 || COMPILE_TEST
++	depends on HAS_IOMEM
++	depends on THERMAL_OF
++	help
++	  Support for thermal sensors on Broadcom bcm2835 SoCs.
++
+ endif
+--- a/drivers/thermal/Makefile
++++ b/drivers/thermal/Makefile
+@@ -48,3 +48,4 @@ obj-$(CONFIG_INTEL_PCH_THERMAL)	+= intel
+ obj-$(CONFIG_ST_THERMAL)	+= st/
+ obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
+ obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
++obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o
+--- /dev/null
++++ b/drivers/thermal/bcm2835_thermal.c
+@@ -0,0 +1,314 @@
++/*
++ * Driver for Broadcom BCM2835 SoC temperature sensor
++ *
++ * Copyright (C) 2016 Martin Sperl
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * 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/clk.h>
++#include <linux/debugfs.h>
++#include <linux/device.h>
++#include <linux/err.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_address.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/thermal.h>
++
++#define BCM2835_TS_TSENSCTL			0x00
++#define BCM2835_TS_TSENSSTAT			0x04
++
++#define BCM2835_TS_TSENSCTL_PRWDW		BIT(0)
++#define BCM2835_TS_TSENSCTL_RSTB		BIT(1)
++
++/*
++ * bandgap reference voltage in 6 mV increments
++ * 000b = 1178 mV, 001b = 1184 mV, ... 111b = 1220 mV
++ */
++#define BCM2835_TS_TSENSCTL_CTRL_BITS		3
++#define BCM2835_TS_TSENSCTL_CTRL_SHIFT		2
++#define BCM2835_TS_TSENSCTL_CTRL_MASK		    \
++	GENMASK(BCM2835_TS_TSENSCTL_CTRL_BITS +     \
++		BCM2835_TS_TSENSCTL_CTRL_SHIFT - 1, \
++		BCM2835_TS_TSENSCTL_CTRL_SHIFT)
++#define BCM2835_TS_TSENSCTL_CTRL_DEFAULT	1
++#define BCM2835_TS_TSENSCTL_EN_INT		BIT(5)
++#define BCM2835_TS_TSENSCTL_DIRECT		BIT(6)
++#define BCM2835_TS_TSENSCTL_CLR_INT		BIT(7)
++#define BCM2835_TS_TSENSCTL_THOLD_SHIFT		8
++#define BCM2835_TS_TSENSCTL_THOLD_BITS		10
++#define BCM2835_TS_TSENSCTL_THOLD_MASK		     \
++	GENMASK(BCM2835_TS_TSENSCTL_THOLD_BITS +     \
++		BCM2835_TS_TSENSCTL_THOLD_SHIFT - 1, \
++		BCM2835_TS_TSENSCTL_THOLD_SHIFT)
++/*
++ * time how long the block to be asserted in reset
++ * which based on a clock counter (TSENS clock assumed)
++ */
++#define BCM2835_TS_TSENSCTL_RSTDELAY_SHIFT	18
++#define BCM2835_TS_TSENSCTL_RSTDELAY_BITS	8
++#define BCM2835_TS_TSENSCTL_REGULEN		BIT(26)
++
++#define BCM2835_TS_TSENSSTAT_DATA_BITS		10
++#define BCM2835_TS_TSENSSTAT_DATA_SHIFT		0
++#define BCM2835_TS_TSENSSTAT_DATA_MASK		     \
++	GENMASK(BCM2835_TS_TSENSSTAT_DATA_BITS +     \
++		BCM2835_TS_TSENSSTAT_DATA_SHIFT - 1, \
++		BCM2835_TS_TSENSSTAT_DATA_SHIFT)
++#define BCM2835_TS_TSENSSTAT_VALID		BIT(10)
++#define BCM2835_TS_TSENSSTAT_INTERRUPT		BIT(11)
++
++struct bcm2835_thermal_data {
++	struct thermal_zone_device *tz;
++	void __iomem *regs;
++	struct clk *clk;
++	struct dentry *debugfsdir;
++};
++
++static int bcm2835_thermal_adc2temp(u32 adc, int offset, int slope)
++{
++	return offset + slope * adc;
++}
++
++static int bcm2835_thermal_temp2adc(int temp, int offset, int slope)
++{
++	temp -= offset;
++	temp /= slope;
++
++	if (temp < 0)
++		temp = 0;
++	if (temp >= BIT(BCM2835_TS_TSENSSTAT_DATA_BITS))
++		temp = BIT(BCM2835_TS_TSENSSTAT_DATA_BITS) - 1;
++
++	return temp;
++}
++
++static int bcm2835_thermal_get_temp(void *d, int *temp)
++{
++	struct bcm2835_thermal_data *data = d;
++	u32 val = readl(data->regs + BCM2835_TS_TSENSSTAT);
++
++	if (!(val & BCM2835_TS_TSENSSTAT_VALID))
++		return -EIO;
++
++	val &= BCM2835_TS_TSENSSTAT_DATA_MASK;
++
++	*temp = bcm2835_thermal_adc2temp(
++		val,
++		thermal_zone_get_offset(data->tz),
++		thermal_zone_get_slope(data->tz));
++
++	return 0;
++}
++
++static const struct debugfs_reg32 bcm2835_thermal_regs[] = {
++	{
++		.name = "ctl",
++		.offset = 0
++	},
++	{
++		.name = "stat",
++		.offset = 4
++	}
++};
++
++static void bcm2835_thermal_debugfs(struct platform_device *pdev)
++{
++	struct thermal_zone_device *tz = platform_get_drvdata(pdev);
++	struct bcm2835_thermal_data *data = tz->devdata;
++	struct debugfs_regset32 *regset;
++
++	data->debugfsdir = debugfs_create_dir("bcm2835_thermal", NULL);
++	if (!data->debugfsdir)
++		return;
++
++	regset = devm_kzalloc(&pdev->dev, sizeof(*regset), GFP_KERNEL);
++	if (!regset)
++		return;
++
++	regset->regs = bcm2835_thermal_regs;
++	regset->nregs = ARRAY_SIZE(bcm2835_thermal_regs);
++	regset->base = data->regs;
++
++	debugfs_create_regset32("regset", 0444, data->debugfsdir, regset);
++}
++
++static struct thermal_zone_of_device_ops bcm2835_thermal_ops = {
++	.get_temp = bcm2835_thermal_get_temp,
++};
++
++/*
++ * Note: as per Raspberry Foundation FAQ
++ * (https://www.raspberrypi.org/help/faqs/#performanceOperatingTemperature)
++ * the recommended temperature range for the SoC -40C to +85C
++ * so the trip limit is set to 80C.
++ * this applies to all the BCM283X SoC
++ */
++
++static const struct of_device_id bcm2835_thermal_of_match_table[] = {
++	{
++		.compatible = "brcm,bcm2835-thermal",
++	},
++	{
++		.compatible = "brcm,bcm2836-thermal",
++	},
++	{
++		.compatible = "brcm,bcm2837-thermal",
++	},
++	{},
++};
++MODULE_DEVICE_TABLE(of, bcm2835_thermal_of_match_table);
++
++static int bcm2835_thermal_probe(struct platform_device *pdev)
++{
++	const struct of_device_id *match;
++	struct thermal_zone_device *tz;
++	struct bcm2835_thermal_data *data;
++	struct resource *res;
++	int err = 0;
++	u32 val;
++	unsigned long rate;
++
++	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
++	if (!data)
++		return -ENOMEM;
++
++	match = of_match_device(bcm2835_thermal_of_match_table,
++				&pdev->dev);
++	if (!match)
++		return -EINVAL;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	data->regs = devm_ioremap_resource(&pdev->dev, res);
++	if (IS_ERR(data->regs)) {
++		err = PTR_ERR(data->regs);
++		dev_err(&pdev->dev, "Could not get registers: %d\n", err);
++		return err;
++	}
++
++	data->clk = devm_clk_get(&pdev->dev, NULL);
++	if (IS_ERR(data->clk)) {
++		err = PTR_ERR(data->clk);
++		if (err != -EPROBE_DEFER)
++			dev_err(&pdev->dev, "Could not get clk: %d\n", err);
++		return err;
++	}
++
++	err = clk_prepare_enable(data->clk);
++	if (err)
++		return err;
++
++	rate = clk_get_rate(data->clk);
++	if ((rate < 1920000) || (rate > 5000000))
++		dev_warn(&pdev->dev,
++			 "Clock %pCn running at %pCr Hz is outside of the recommended range: 1.92 to 5MHz\n",
++			 data->clk, data->clk);
++
++	/* register of thermal sensor and get info from DT */
++	tz = thermal_zone_of_sensor_register(&pdev->dev, 0, data,
++					     &bcm2835_thermal_ops);
++	if (IS_ERR(tz)) {
++		err = PTR_ERR(tz);
++		dev_err(&pdev->dev,
++			"Failed to register the thermal device: %d\n",
++			err);
++		goto err_clk;
++	}
++
++	/*
++	 * right now the FW does set up the HW-block, so we are not
++	 * touching the configuration registers.
++	 * But if the HW is not enabled, then set it up
++	 * using "sane" values used by the firmware right now.
++	 */
++	val = readl(data->regs + BCM2835_TS_TSENSCTL);
++	if (!(val & BCM2835_TS_TSENSCTL_RSTB)) {
++		int trip_temp, offset, slope;
++
++		slope = thermal_zone_get_slope(tz);
++		offset = thermal_zone_get_offset(tz);
++		/*
++		 * For now we deal only with critical, otherwise
++		 * would need to iterate
++		 */
++		err = tz->ops->get_trip_temp(tz, 0, &trip_temp);
++		if (err < 0) {
++			err = PTR_ERR(tz);
++			dev_err(&pdev->dev,
++				"Not able to read trip_temp: %d\n",
++				err);
++			goto err_tz;
++		}
++
++		/* set bandgap reference voltage and enable voltage regulator */
++		val = (BCM2835_TS_TSENSCTL_CTRL_DEFAULT <<
++		       BCM2835_TS_TSENSCTL_CTRL_SHIFT) |
++		      BCM2835_TS_TSENSCTL_REGULEN;
++
++		/* use the recommended reset duration */
++		val |= (0xFE << BCM2835_TS_TSENSCTL_RSTDELAY_SHIFT);
++
++		/*  trip_adc value from info */
++		val |= bcm2835_thermal_temp2adc(trip_temp,
++						offset,
++						slope)
++			<< BCM2835_TS_TSENSCTL_THOLD_SHIFT;
++
++		/* write the value back to the register as 2 steps */
++		writel(val, data->regs + BCM2835_TS_TSENSCTL);
++		val |= BCM2835_TS_TSENSCTL_RSTB;
++		writel(val, data->regs + BCM2835_TS_TSENSCTL);
++	}
++
++	data->tz = tz;
++
++	platform_set_drvdata(pdev, tz);
++
++	bcm2835_thermal_debugfs(pdev);
++
++	return 0;
++err_tz:
++	thermal_zone_of_sensor_unregister(&pdev->dev, tz);
++err_clk:
++	clk_disable_unprepare(data->clk);
++
++	return err;
++}
++
++static int bcm2835_thermal_remove(struct platform_device *pdev)
++{
++	struct thermal_zone_device *tz = platform_get_drvdata(pdev);
++	struct bcm2835_thermal_data *data = tz->devdata;
++
++	debugfs_remove_recursive(data->debugfsdir);
++	thermal_zone_of_sensor_unregister(&pdev->dev, tz);
++	clk_disable_unprepare(data->clk);
++
++	return 0;
++}
++
++static struct platform_driver bcm2835_thermal_driver = {
++	.probe = bcm2835_thermal_probe,
++	.remove = bcm2835_thermal_remove,
++	.driver = {
++		.name = "bcm2835_thermal",
++		.of_match_table = bcm2835_thermal_of_match_table,
++	},
++};
++module_platform_driver(bcm2835_thermal_driver);
++
++MODULE_AUTHOR("Martin Sperl");
++MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
++MODULE_LICENSE("GPL");
diff --git a/target/linux/generic/patches-4.4/086-0004-thermal-broadcom-add-Northstar-thermal-driver.patch b/target/linux/generic/patches-4.4/086-0004-thermal-broadcom-add-Northstar-thermal-driver.patch
new file mode 100644
index 0000000..1821096
--- /dev/null
+++ b/target/linux/generic/patches-4.4/086-0004-thermal-broadcom-add-Northstar-thermal-driver.patch
@@ -0,0 +1,173 @@
+From a94cb7eeecc4104a6874339f90c5d0647359c102 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 3 Apr 2017 17:48:29 +0200
+Subject: [PATCH] thermal: broadcom: add Northstar thermal driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Northstar is a SoC family commonly used in home routers. This commit
+adds a driver for checking CPU temperature. As Northstar Plus seems to
+also have this IP block this new symbol gets ARCH_BCM_IPROC dependency.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Jon Mason <jon.mason@broadcom.com>
+Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
+---
+ drivers/thermal/Kconfig               |   5 ++
+ drivers/thermal/Makefile              |   1 +
+ drivers/thermal/broadcom/Kconfig      |   8 +++
+ drivers/thermal/broadcom/Makefile     |   1 +
+ drivers/thermal/broadcom/ns-thermal.c | 105 ++++++++++++++++++++++++++++++++++
+ 5 files changed, 120 insertions(+)
+ create mode 100644 drivers/thermal/broadcom/Kconfig
+ create mode 100644 drivers/thermal/broadcom/Makefile
+ create mode 100644 drivers/thermal/broadcom/ns-thermal.c
+
+--- a/drivers/thermal/Kconfig
++++ b/drivers/thermal/Kconfig
+@@ -365,6 +365,11 @@ config INTEL_PCH_THERMAL
+ 	  Thermal reporting device will provide temperature reading,
+ 	  programmable trip points and other information.
+ 
++menu "Broadcom thermal drivers"
++depends on ARCH_BCM || COMPILE_TEST
++source "drivers/thermal/broadcom/Kconfig"
++endmenu
++
+ menu "Texas Instruments thermal drivers"
+ depends on ARCH_HAS_BANDGAP || COMPILE_TEST
+ source "drivers/thermal/ti-soc-thermal/Kconfig"
+--- a/drivers/thermal/Makefile
++++ b/drivers/thermal/Makefile
+@@ -26,6 +26,7 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL)	+= c
+ thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
+ 
+ # platform thermal drivers
++obj-y				+= broadcom/
+ obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM)	+= qcom-spmi-temp-alarm.o
+ obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o
+ obj-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o
+--- /dev/null
++++ b/drivers/thermal/broadcom/Kconfig
+@@ -0,0 +1,8 @@
++config BCM_NS_THERMAL
++	tristate "Northstar thermal driver"
++	depends on ARCH_BCM_IPROC || COMPILE_TEST
++	help
++	  Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,
++	  BCM4709 and BCM47094. It contains DMU (Device Management Unit) block
++	  with a thermal sensor that allows checking CPU temperature. This
++	  driver provides support for it.
+--- /dev/null
++++ b/drivers/thermal/broadcom/Makefile
+@@ -0,0 +1 @@
++obj-$(CONFIG_BCM_NS_THERMAL)		+= ns-thermal.o
+--- /dev/null
++++ b/drivers/thermal/broadcom/ns-thermal.c
+@@ -0,0 +1,105 @@
++/*
++ * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
++ *
++ * 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.
++ */
++
++#include <linux/module.h>
++#include <linux/of_address.h>
++#include <linux/platform_device.h>
++#include <linux/thermal.h>
++
++#define PVTMON_CONTROL0					0x00
++#define PVTMON_CONTROL0_SEL_MASK			0x0000000e
++#define PVTMON_CONTROL0_SEL_TEMP_MONITOR		0x00000000
++#define PVTMON_CONTROL0_SEL_TEST_MODE			0x0000000e
++#define PVTMON_STATUS					0x08
++
++struct ns_thermal {
++	struct thermal_zone_device *tz;
++	void __iomem *pvtmon;
++};
++
++static int ns_thermal_get_temp(void *data, int *temp)
++{
++	struct ns_thermal *ns_thermal = data;
++	int offset = thermal_zone_get_offset(ns_thermal->tz);
++	int slope = thermal_zone_get_slope(ns_thermal->tz);
++	u32 val;
++
++	val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
++	if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
++		/* Clear current mode selection */
++		val &= ~PVTMON_CONTROL0_SEL_MASK;
++
++		/* Set temp monitor mode (it's the default actually) */
++		val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
++
++		writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
++	}
++
++	val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
++	*temp = slope * val + offset;
++
++	return 0;
++}
++
++static const struct thermal_zone_of_device_ops ns_thermal_ops = {
++	.get_temp = ns_thermal_get_temp,
++};
++
++static int ns_thermal_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	struct ns_thermal *ns_thermal;
++
++	ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
++	if (!ns_thermal)
++		return -ENOMEM;
++
++	ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
++	if (WARN_ON(!ns_thermal->pvtmon))
++		return -ENOENT;
++
++	ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
++							      ns_thermal,
++							      &ns_thermal_ops);
++	if (IS_ERR(ns_thermal->tz)) {
++		iounmap(ns_thermal->pvtmon);
++		return PTR_ERR(ns_thermal->tz);
++	}
++
++	platform_set_drvdata(pdev, ns_thermal);
++
++	return 0;
++}
++
++static int ns_thermal_remove(struct platform_device *pdev)
++{
++	struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
++
++	iounmap(ns_thermal->pvtmon);
++
++	return 0;
++}
++
++static const struct of_device_id ns_thermal_of_match[] = {
++	{ .compatible = "brcm,ns-thermal", },
++	{},
++};
++MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
++
++static struct platform_driver ns_thermal_driver = {
++	.probe		= ns_thermal_probe,
++	.remove		= ns_thermal_remove,
++	.driver = {
++		.name = "ns-thermal",
++		.of_match_table = ns_thermal_of_match,
++	},
++};
++module_platform_driver(ns_thermal_driver);
++
++MODULE_DESCRIPTION("Northstar thermal driver");
++MODULE_LICENSE("GPL v2");
diff --git a/target/linux/generic/patches-4.4/086-0005-thermal-broadcom-fix-compilation-of-Northstar-driver.patch b/target/linux/generic/patches-4.4/086-0005-thermal-broadcom-fix-compilation-of-Northstar-driver.patch
new file mode 100644
index 0000000..62bfffe
--- /dev/null
+++ b/target/linux/generic/patches-4.4/086-0005-thermal-broadcom-fix-compilation-of-Northstar-driver.patch
@@ -0,0 +1,19 @@
+From d44264c8735f79da3253520024841311c555ca31 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 14 Apr 2017 22:25:12 +0200
+Subject: [PATCH] thermal: broadcom: fix compilation of Northstar driver
+
+---
+ drivers/thermal/broadcom/ns-thermal.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/thermal/broadcom/ns-thermal.c
++++ b/drivers/thermal/broadcom/ns-thermal.c
+@@ -6,6 +6,7 @@
+  * published by the Free Software Foundation.
+  */
+ 
++#include <asm/io.h>
+ #include <linux/module.h>
+ #include <linux/of_address.h>
+ #include <linux/platform_device.h>