[PATCH v3 0/4] Rockchip soc theamal driver

[PATCH v3 0/4] Rockchip soc theamal driver

[Caesar Wang]

Changes in v3:(add dts configure)
        * address comments from Dmitry Torokhov and Arnd Bergmann:
        - fix clock-names in rockchip-thermal.txt
        - remove rockchip_thermal_control() in rockchip_set_mode()
        - fix some code style.
        - add dts configure.

Changes in v2:
        * address comments from Heiko Stubner:
        - fix dt-bindings in rockchip-thermal.txt
        - remove Author mark
        - rename TSADC_XXX->TSADCV2_XXX,it eill ready to merge compatible other SoCs.
        - fix a identation
        - remove clk_set_rate(),it's no necessary.
        - fix the SIMPLE_DEV_PM_OPS() function  style.

Tested On rk3288 SDK board.

Caesar Wang (4):
  thermal: rockchip: add driver for thermal
  dt-bindings: document Rockchip thermal
  ARM: dts: add main Thermal info to rk3288
  ARM: dts: enable Thermal on rk3288-evb board

 .../bindings/thermal/rockchip-thermal.txt          |  20 +
 arch/arm/boot/dts/rk3288-evb.dtsi                  |   7 +
 arch/arm/boot/dts/rk3288.dtsi                      |  18 +
 drivers/thermal/Kconfig                            |   9 +
 drivers/thermal/Makefile                           |   1 +
 drivers/thermal/rockchip_thermal.c                 | 669 +++++++++++++++++++++
 6 files changed, 724 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
 create mode 100644 drivers/thermal/rockchip_thermal.c

-- 
1.9.1

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Caesar Wang]

Thermal is TS-ADC Controller module supports user-defined mode and automatic mode.

User-defined mode refers,TSADC all the control signals entirely by software
writing to register for direct control.

Automaic mode refers to the module automatically poll TSADC output,and the results
Were checked.

If you find that the temperature High in a period of time, an interrupt is generated
to the processor down-measures taken;if the temperature over a period of time High,
the resulting TSHUT gave CRU module,let it reset the entire chip, or via GPIO give PMIC.

Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
---
 drivers/thermal/Kconfig            |   9 +
 drivers/thermal/Makefile           |   1 +
 drivers/thermal/rockchip_thermal.c | 669 +++++++++++++++++++++++++++++++++++++
 3 files changed, 679 insertions(+)
 create mode 100644 drivers/thermal/rockchip_thermal.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index f9a1386..a00aa1e 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -133,6 +133,15 @@ config SPEAR_THERMAL
 	  Enable this to plug the SPEAr thermal sensor driver into the Linux
 	  thermal framework.
 
+config ROCKCHIP_THERMAL
+	tristate "Rockchip thermal driver"
+	depends on ARCH_ROCKCHIP
+	help
+	  Support for Temperature Sensor ADC (TS-ADC) found on Rockchip SoCs.
+	  It supports one critical trip point and one passive trip point.  The
+	  cpufreq is used as the cooling device to throttle CPUs when the
+	  passive trip is crossed.
+
 config RCAR_THERMAL
 	tristate "Renesas R-Car thermal driver"
 	depends on ARCH_SHMOBILE || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index de0636a..b48b817 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -19,6 +19,7 @@ thermal_sys-$(CONFIG_CPU_THERMAL)	+= cpu_cooling.o
 
 # platform thermal drivers
 obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o
+obj-$(CONFIG_ROCKCHIP_THERMAL) 	+= rockchip_thermal.o
 obj-$(CONFIG_RCAR_THERMAL)	+= rcar_thermal.o
 obj-$(CONFIG_KIRKWOOD_THERMAL)  += kirkwood_thermal.o
 obj-y				+= samsung/
diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
new file mode 100644
index 0000000..011f387
--- /dev/null
+++ b/drivers/thermal/rockchip_thermal.c
@@ -0,0 +1,669 @@
+/*
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/cpu_cooling.h>
+#include "thermal_core.h"
+
+enum rockchip_thermal_trip {
+	ROCKCHIP_TRIP_PASSIVE,
+	ROCKCHIP_TRIP_CRITICAL,
+	ROCKCHIP_TRIP_NUM,
+};
+
+struct rockchip_thermal_data {
+	const struct rockchip_tsadc_platform_data *pdata;
+	struct thermal_zone_device *tz;
+	struct thermal_cooling_device *cdev;
+	enum thermal_device_mode mode;
+	void __iomem *regs;
+
+	signed long temp_passive;
+	signed long temp_critical;
+	signed long temp_force_shut;
+	signed long alarm_temp;
+	signed long last_temp;
+	bool irq_enabled;
+	int irq;
+	struct clk *clk;
+	struct clk *pclk;
+};
+
+struct rockchip_tsadc_platform_data {
+	u8 irq_en;
+	signed long temp_passive;
+	signed long temp_critical;
+	signed long temp_force_shut;
+	int passive_delay;
+	int polling_delay;
+
+	int (*irq_handle)(void __iomem *reg);
+	int (*initialize)(void __iomem *reg, signed long temp_force_shut);
+	int (*control)(void __iomem *reg, bool on);
+	u32 (*code_to_temp)(int temp);
+	u32 (*temp_to_code)(int temp);
+	void (*set_alarm_temp)(void __iomem *regs, signed long temp);
+};
+
+/*TSADC V2 Sensor info define:*/
+#define TSADCV2_AUTO_CON			0x04
+#define TSADCV2_INT_EN				0x08
+#define TSADCV2_INT_PD				0x0c
+#define TSADCV2_DATA1				0x24
+#define TSADCV2_COMP1_INT			0x34
+#define TSADCV2_COMP1_SHUT			0x44
+#define TSADCV2_AUTO_PERIOD			0x68
+#define TSADCV2_AUTO_PERIOD_HT			0x6c
+
+#define TSADCV2_AUTO_SRC1_EN			(1 << 5)
+#define TSADCV2_AUTO_EN				(1 << 0)
+#define TSADCV2_AUTO_DISABLE			~(1 << 0)
+#define TSADCV2_AUTO_STAS_BUSY			(1 << 16)
+#define TSADCV2_AUTO_STAS_BUSY_MASK		(1 << 16)
+#define TSADCV2_SHUT_2GPIO_SRC1_EN		(1 << 5)
+#define TSADCV2_INT_SRC1_EN			(1 << 1)
+#define TSADCV2_SHUT_SRC1_STATUS		(1 << 5)
+#define TSADCV2_INT_SRC1_STATUS			(1 << 1)
+
+#define TSADCV2_DATA_MASK			0xfff
+#define TSADCV2_HIGHT_INT_DEBOUNCE		0x60
+#define TSADCV2_HIGHT_TSHUT_DEBOUNCE		0x64
+#define TSADCV2_HIGHT_INT_DEBOUNCE_TIME		0x0a
+#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME	0x0a
+#define TSADCV2_AUTO_PERIOD_TIME		0x03e8
+#define TSADCV2_AUTO_PERIOD_HT_TIME		0x64
+
+struct tsadc_table {
+	int code;
+	int temp;
+};
+
+static const struct tsadc_table v2_code_table[] = {
+	{TSADCV2_DATA_MASK, -40},
+	{3800, -40},
+	{3792, -35},
+	{3783, -30},
+	{3774, -25},
+	{3765, -20},
+	{3756, -15},
+	{3747, -10},
+	{3737, -5},
+	{3728, 0},
+	{3718, 5},
+	{3708, 10},
+	{3698, 15},
+	{3688, 20},
+	{3678, 25},
+	{3667, 30},
+	{3656, 35},
+	{3645, 40},
+	{3634, 45},
+	{3623, 50},
+	{3611, 55},
+	{3600, 60},
+	{3588, 65},
+	{3575, 70},
+	{3563, 75},
+	{3550, 80},
+	{3537, 85},
+	{3524, 90},
+	{3510, 95},
+	{3496, 100},
+	{3482, 105},
+	{3467, 110},
+	{3452, 115},
+	{3437, 120},
+	{3421, 125},
+	{0, 125},
+};
+
+static int rk_tsadcv2_irq_handle(void __iomem *regs)
+{
+	u32 val;
+
+	val = readl_relaxed(regs + TSADCV2_INT_PD);
+	writel_relaxed(val & ~(1 << 8), regs + TSADCV2_INT_PD);
+
+	return 0;
+}
+
+static u32 rk_tsadcv2_temp_to_code(int temp)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(v2_code_table) - 1; i++) {
+		if (temp <= v2_code_table[i].temp && temp >
+		    v2_code_table[i - 1].temp)
+			return v2_code_table[i].code;
+	}
+
+	return 0;
+}
+
+static u32 rk_tsadcv2_code_to_temp(int code)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(v2_code_table) - 1; i++) {
+		if (code <= v2_code_table[i].code && code >
+		    v2_code_table[i + 1].code){
+			return v2_code_table[i].temp;
+		}
+	}
+
+	return 0;
+}
+
+static int rk_tsadcv2_initialize(void __iomem *regs,
+				 signed long temp_force_shut)
+{
+	int shutdown_value;
+
+	shutdown_value = rk_tsadcv2_temp_to_code(temp_force_shut);
+	/* Enable measurements at ~ 10 Hz */
+	writel_relaxed(0, regs + TSADCV2_AUTO_CON);
+	writel_relaxed(TSADCV2_AUTO_PERIOD_TIME, regs + TSADCV2_AUTO_PERIOD);
+	writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME, regs +
+		       TSADCV2_AUTO_PERIOD_HT);
+	writel_relaxed(shutdown_value, regs + TSADCV2_COMP1_SHUT);
+	writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_TIME, regs +
+		       TSADCV2_HIGHT_INT_DEBOUNCE);
+	writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME, regs +
+		       TSADCV2_HIGHT_TSHUT_DEBOUNCE);
+	writel_relaxed(TSADCV2_SHUT_2GPIO_SRC1_EN | TSADCV2_INT_SRC1_EN, regs +
+		       TSADCV2_INT_EN);
+	writel_relaxed(TSADCV2_AUTO_SRC1_EN | TSADCV2_AUTO_EN, regs +
+		       TSADCV2_AUTO_CON);
+
+	return 0;
+}
+
+static int rk_tsadcv2_control(void __iomem *regs, bool on)
+{
+	u32 val;
+
+	if (on) {
+		val = readl_relaxed(regs + TSADCV2_AUTO_CON);
+		writel_relaxed(val | TSADCV2_AUTO_EN, regs + TSADCV2_AUTO_CON);
+	} else {
+		val = readl_relaxed(regs + TSADCV2_AUTO_CON);
+		writel_relaxed(val & TSADCV2_AUTO_DISABLE,
+			       regs + TSADCV2_AUTO_CON);
+	}
+
+	return 0;
+}
+
+static void rk_tsadcv2_alarm_temp(void __iomem *regs, signed long alarm_temp)
+{
+	int alarm_value;
+
+	alarm_value = rk_tsadcv2_temp_to_code(alarm_temp);
+	writel_relaxed(alarm_value, regs + TSADCV2_COMP1_INT);
+}
+
+struct rockchip_tsadc_platform_data const rk3288_tsadc_data = {
+	.irq_en = 1,
+	.temp_passive = 85000,
+	.temp_critical = 100000,
+	.temp_force_shut = 120000,
+	.passive_delay = 2000,
+	.polling_delay = 1000,
+	.irq_handle = rk_tsadcv2_irq_handle,
+	.initialize = rk_tsadcv2_initialize,
+	.control = rk_tsadcv2_control,
+	.code_to_temp = rk_tsadcv2_code_to_temp,
+	.temp_to_code = rk_tsadcv2_temp_to_code,
+	.set_alarm_temp = rk_tsadcv2_alarm_temp,
+};
+
+static const struct of_device_id of_rockchip_thermal_match[] = {
+	{
+		.compatible = "rockchip,rk3288-tsadc",
+		.data = (void *)&rk3288_tsadc_data,
+	},
+	{ /* end */ },
+};
+MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
+
+static void rockchip_set_alarm_temp(struct rockchip_thermal_data *data,
+				    signed long alarm_temp)
+{
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+
+	data->alarm_temp = alarm_temp;
+	if (p_tsadc_data->set_alarm_temp)
+		p_tsadc_data->set_alarm_temp(data->regs, alarm_temp);
+}
+
+static int rockchip_get_temp(struct thermal_zone_device *tz,
+			     unsigned long *temp)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+	u32 val;
+
+	val = readl_relaxed(data->regs + TSADCV2_DATA1);
+	*temp = p_tsadc_data->code_to_temp(val);
+
+	/* Update alarm value to next higher trip point */
+	if (data->alarm_temp == data->temp_passive && *temp >=
+	    data->temp_passive)
+		rockchip_set_alarm_temp(data, data->temp_critical);
+
+	if (data->alarm_temp == data->temp_critical && *temp <
+	    data->temp_passive) {
+		rockchip_set_alarm_temp(data, data->temp_passive);
+		dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
+			data->alarm_temp / 1000);
+	}
+
+	if (*temp != data->last_temp) {
+		dev_dbg(&tz->device, "millicelsius: %ld\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 rockchip_thermal_initialize(struct rockchip_thermal_data *data)
+{
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+
+	if (p_tsadc_data->initialize)
+		p_tsadc_data->initialize(data->regs, data->temp_force_shut);
+	rockchip_set_alarm_temp(data, data->temp_passive);
+
+	return 0;
+}
+
+static void rockchip_thermal_control(struct rockchip_thermal_data *data,
+				     bool on)
+{
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+
+	if (p_tsadc_data->control)
+		p_tsadc_data->control(data->regs, on);
+
+	if (on) {
+		data->irq_enabled = true;
+		data->mode = THERMAL_DEVICE_ENABLED;
+	} else {
+		data->irq_enabled = false;
+		data->mode = THERMAL_DEVICE_DISABLED;
+	}
+}
+
+static int rockchip_get_mode(struct thermal_zone_device *tz,
+			     enum thermal_device_mode *mode)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+
+	*mode = data->mode;
+
+	return 0;
+}
+
+static int rockchip_set_mode(struct thermal_zone_device *tz,
+			     enum thermal_device_mode mode)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+
+	if (mode == THERMAL_DEVICE_ENABLED) {
+		tz->polling_delay = p_tsadc_data->polling_delay;
+		tz->passive_delay = p_tsadc_data->passive_delay;
+		if (!data->irq_enabled) {
+			data->irq_enabled = true;
+			enable_irq(data->irq);
+		}
+	} else {
+		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);
+
+	return 0;
+}
+
+static int rockchip_get_trip_type(struct thermal_zone_device *tz, int trip,
+				  enum thermal_trip_type *type)
+{
+	*type = (trip == ROCKCHIP_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
+		 THERMAL_TRIP_CRITICAL;
+
+	return 0;
+}
+
+static int rockchip_get_crit_temp(struct thermal_zone_device *tz,
+				  unsigned long *temp)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+
+	*temp = data->temp_critical;
+
+	return 0;
+}
+
+static int rockchip_get_trip_temp(struct thermal_zone_device *tz, int trip,
+				  unsigned long *temp)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+
+	*temp = (trip == ROCKCHIP_TRIP_PASSIVE) ? data->temp_passive :
+		 data->temp_critical;
+
+	return 0;
+}
+
+static int rockchip_set_trip_temp(struct thermal_zone_device *tz, int trip,
+				  unsigned long temp)
+{
+	struct rockchip_thermal_data *data = tz->devdata;
+
+	if (trip == ROCKCHIP_TRIP_CRITICAL)
+		return -EPERM;
+
+	data->temp_passive = temp;
+	rockchip_set_alarm_temp(data, temp);
+
+	return 0;
+}
+
+static int rockchip_bind(struct thermal_zone_device *tz,
+			 struct thermal_cooling_device *cdev)
+{
+	int ret;
+
+	ret = thermal_zone_bind_cooling_device(tz, ROCKCHIP_TRIP_PASSIVE, cdev,
+					       THERMAL_NO_LIMIT,
+					       THERMAL_NO_LIMIT);
+	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 rockchip_unbind(struct thermal_zone_device *tz,
+			   struct thermal_cooling_device *cdev)
+{
+	int ret;
+
+	ret = thermal_zone_unbind_cooling_device(tz,
+						 ROCKCHIP_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 rockchip_tz_ops = {
+	.bind = rockchip_bind,
+	.unbind = rockchip_unbind,
+	.get_temp = rockchip_get_temp,
+	.get_mode = rockchip_get_mode,
+	.set_mode = rockchip_set_mode,
+	.get_trip_type = rockchip_get_trip_type,
+	.get_trip_temp = rockchip_get_trip_temp,
+	.get_crit_temp = rockchip_get_crit_temp,
+	.set_trip_temp = rockchip_set_trip_temp,
+};
+
+static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
+{
+	struct rockchip_thermal_data *data = data;
+	const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
+
+	dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
+		data->alarm_temp / 1000);
+
+	if (p_tsadc_data->irq_en && p_tsadc_data->irq_handle)
+		p_tsadc_data->irq_handle(data->regs);
+
+	thermal_zone_device_update(data->tz);
+
+	return IRQ_HANDLED;
+}
+
+static int rockchip_thermal_probe(struct platform_device *pdev)
+{
+	struct rockchip_thermal_data *data;
+	const struct rockchip_tsadc_platform_data *p_tsadc_data;
+	struct cpumask clip_cpus;
+	struct resource *res;
+	const struct of_device_id *match;
+	int ret, temp;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(struct rockchip_thermal_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->regs)) {
+		dev_err(&pdev->dev, "Could not get tsadc source, %p\n",
+			data->regs);
+		return PTR_ERR(data->regs);
+	}
+
+	match = of_match_node(of_rockchip_thermal_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
+	data->pdata = (const struct rockchip_tsadc_platform_data *)match->data;
+	if (!data->pdata)
+		return -EINVAL;
+	p_tsadc_data = data->pdata;
+
+	data->clk = devm_clk_get(&pdev->dev, "tsadc");
+	if (IS_ERR(data->clk)) {
+		dev_err(&pdev->dev, "failed to get tsadc clock\n");
+		return PTR_ERR(data->clk);
+	}
+
+	data->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
+	if (IS_ERR(data->pclk)) {
+		dev_err(&pdev->dev, "failed to get tsadc pclk\n");
+		return PTR_ERR(data->pclk);
+	}
+
+	/*
+	* Use a default of 10KHz for the converter clock.
+	* This may become user-configurable in the future.
+	*/
+	ret = clk_set_rate(data->clk, 10000);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to set tsadc clk rate, %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(data->clk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to enable converter clock\n");
+		goto err_clk;
+	}
+
+	ret = clk_prepare_enable(data->pclk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to enable pclk\n");
+		goto err_pclk;
+	}
+
+	platform_set_drvdata(pdev, data);
+
+	if (of_property_read_u32(pdev->dev.of_node, "passive-temp", &temp)) {
+		dev_warn(&pdev->dev,
+			 "Missing default passive temp property in the DT.\n");
+		data->temp_passive = p_tsadc_data->temp_passive;
+	} else {
+		data->temp_passive = temp;
+	}
+
+	if (of_property_read_u32(pdev->dev.of_node, "critical-temp", &temp)) {
+		dev_warn(&pdev->dev,
+			 "Missing default critical temp property in the DT.\n");
+		data->temp_critical = p_tsadc_data->temp_critical;
+	} else {
+		data->temp_critical = temp;
+	}
+
+	if (of_property_read_u32(pdev->dev.of_node, "force-shut-temp", &temp)) {
+		dev_warn(&pdev->dev,
+			 "Missing default force shut down temp property in the DT.\n");
+		data->temp_force_shut = p_tsadc_data->temp_force_shut;
+	} else {
+		data->temp_force_shut = temp;
+	}
+
+	cpumask_set_cpu(0, &clip_cpus);
+	data->cdev = of_cpufreq_cooling_register(pdev->dev.of_node, &clip_cpus);
+	if (IS_ERR(data->cdev)) {
+		dev_err(&pdev->dev, "failed to register cpufreq cooling device\n");
+		goto disable_clk;
+	}
+
+	data->tz = thermal_zone_device_register("rockchip_thermal",
+						ROCKCHIP_TRIP_NUM,
+						0, data,
+						&rockchip_tz_ops, NULL,
+						p_tsadc_data->passive_delay,
+						p_tsadc_data->polling_delay);
+
+	if (IS_ERR(data->tz)) {
+		dev_err(&pdev->dev, "failed to register thermal zone device\n");
+		goto fail_cpufreq_register;
+	}
+
+	if (p_tsadc_data->irq_en) {
+		data->irq = platform_get_irq(pdev, 0);
+		if (data->irq < 0) {
+			dev_err(&pdev->dev, "no irq resource?\n");
+			goto fail_irq;
+		}
+
+		ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
+				rockchip_thermal_alarm_irq_thread,
+				IRQF_ONESHOT, "rockchip_thermal", data);
+		if (ret < 0) {
+			dev_err(&pdev->dev,
+				"failed to request tsadc irq: %d\n", ret);
+			goto fail_thermal_unregister;
+		}
+	}
+
+	rockchip_thermal_initialize(data);
+	rockchip_thermal_control(data, true);
+
+	return 0;
+
+fail_thermal_unregister:
+	thermal_zone_device_unregister(data->tz);
+fail_irq:
+fail_cpufreq_register:
+	cpufreq_cooling_unregister(data->cdev);
+disable_clk:
+err_pclk:
+	clk_disable_unprepare(data->pclk);
+err_clk:
+	clk_disable_unprepare(data->clk);
+
+	return ret;
+}
+
+static int rockchip_thermal_remove(struct platform_device *pdev)
+{
+	struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
+
+	rockchip_thermal_control(data, false);
+
+	thermal_zone_device_unregister(data->tz);
+	cpufreq_cooling_unregister(data->cdev);
+	cpufreq_cooling_unregister(data->cdev);
+
+	clk_disable_unprepare(data->clk);
+	clk_disable_unprepare(data->pclk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_thermal_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
+
+	rockchip_thermal_control(data, false);
+
+	return 0;
+}
+
+static int rockchip_thermal_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
+
+	rockchip_thermal_initialize(data);
+	rockchip_thermal_control(data, true);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rockchip_thermal_pm_ops,
+			 rockchip_thermal_suspend, rockchip_thermal_resume);
+
+static struct platform_driver rockchip_thermal_driver = {
+	.driver = {
+		   .name = "rockchip-thermal",
+		   .owner = THIS_MODULE,
+		   .pm = &rockchip_thermal_pm_ops,
+		   .of_match_table = of_rockchip_thermal_match,
+		   },
+	.probe = rockchip_thermal_probe,
+	.remove = rockchip_thermal_remove,
+};
+
+module_platform_driver(rockchip_thermal_driver);
+
+MODULE_DESCRIPTION("ROCKCHIP THERMAL Driver");
+MODULE_AUTHOR("Rockchip, Inc.");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rockchip-thermal");
-- 
1.9.1

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Arnd Bergmann]

On Thursday 28 August 2014 08:59:19 Caesar Wang wrote:
> Thermal is TS-ADC Controller module supports user-defined mode and automatic mode.
> 
> User-defined mode refers,TSADC all the control signals entirely by software
> writing to register for direct control.
> 
> Automaic mode refers to the module automatically poll TSADC output,and the results
> Were checked.
> 
> If you find that the temperature High in a period of time, an interrupt is generated
> to the processor down-measures taken;if the temperature over a period of time High,
> the resulting TSHUT gave CRU module,let it reset the entire chip, or via GPIO give PMIC.
> 
> Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
> Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>

Hi Caesar,

After looking at the driver (last time I only received the patch for
the binding), I have a more general comment:

This looks like a general-purpose ADC device, not an IP block that is
specific to thermal management. The binding looks ok for that purpose
but should probably be moved into Documentation/devicetree/bindings/iio/adc/
as a minor change.

On the driver side, I believe the correct way to deal with this setup
is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
file, and a smaller thermal driver that uses the iio in-kernel interfaces,
ideally one that is independent of the underlying hardware and can
work on any ADC implementation.

I've put the IIO maintainer on Cc in this mail, maybe Jonathan or someone
else on the linux-iio mailing list has some extra insight.

	Arnd

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Eduardo Valentin]

Ceasar and Arnd,

On Thu, Aug 28, 2014 at 10:48:23AM +0200, Arnd Bergmann wrote:
> On Thursday 28 August 2014 08:59:19 Caesar Wang wrote:
> > Thermal is TS-ADC Controller module supports user-defined mode and automatic mode.
> > 
> > User-defined mode refers,TSADC all the control signals entirely by software
> > writing to register for direct control.
> > 
> > Automaic mode refers to the module automatically poll TSADC output,and the results
> > Were checked.
> > 
> > If you find that the temperature High in a period of time, an interrupt is generated
> > to the processor down-measures taken;if the temperature over a period of time High,
> > the resulting TSHUT gave CRU module,let it reset the entire chip, or via GPIO give PMIC.
> > 
> > Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
> > Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
> 
> Hi Caesar,
> 
> After looking at the driver (last time I only received the patch for
> the binding), I have a more general comment:
> 
> This looks like a general-purpose ADC device, not an IP block that is
> specific to thermal management. The binding looks ok for that purpose
> but should probably be moved into Documentation/devicetree/bindings/iio/adc/
> as a minor change.
> 

I agree with Arnd's point here. It makes sense to me to have this driver
under the IIO umbrella. 

> On the driver side, I believe the correct way to deal with this setup
> is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
> file, and a smaller thermal driver that uses the iio in-kernel interfaces,
> ideally one that is independent of the underlying hardware and can
> work on any ADC implementation.
> 

Agreed. If you can write such interface and make your driver to work in
such way, that would be great.

> I've put the IIO maintainer on Cc in this mail, maybe Jonathan or someone
> else on the linux-iio mailing list has some extra insight.
> 
> 	Arnd


Cheers,

Eduardo

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Heiko Stübner]

Am Donnerstag, 28. August 2014, 10:37:35 schrieb Eduardo Valentin:
> Ceasar and Arnd,
> 
> On Thu, Aug 28, 2014 at 10:48:23AM +0200, Arnd Bergmann wrote:
> > On Thursday 28 August 2014 08:59:19 Caesar Wang wrote:
> > > Thermal is TS-ADC Controller module supports user-defined mode and
> > > automatic mode.
> > > 
> > > User-defined mode refers,TSADC all the control signals entirely by
> > > software
> > > writing to register for direct control.
> > > 
> > > Automaic mode refers to the module automatically poll TSADC output,and
> > > the results Were checked.
> > > 
> > > If you find that the temperature High in a period of time, an interrupt
> > > is generated to the processor down-measures taken;if the temperature
> > > over a period of time High, the resulting TSHUT gave CRU module,let it
> > > reset the entire chip, or via GPIO give PMIC.
> > > 
> > > Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
> > > Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
> > 
> > Hi Caesar,
> > 
> > After looking at the driver (last time I only received the patch for
> > the binding), I have a more general comment:
> > 
> > This looks like a general-purpose ADC device, not an IP block that is
> > specific to thermal management. The binding looks ok for that purpose
> > but should probably be moved into
> > Documentation/devicetree/bindings/iio/adc/ as a minor change.
> 
> I agree with Arnd's point here. It makes sense to me to have this driver
> under the IIO umbrella.

interesting suggestion :-)

I've just taken another look at the registers of the ts-adc on the rk3066 
which is completely different from the rk3288 one. Interestingly the rk3066 one 
is "just" another saradc IP, so for this one it would really make sense.


> > On the driver side, I believe the correct way to deal with this setup
> > is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
> > file, and a smaller thermal driver that uses the iio in-kernel interfaces,
> > ideally one that is independent of the underlying hardware and can
> > work on any ADC implementation.
> 
> Agreed. If you can write such interface and make your driver to work in
> such way, that would be great.

But I currently don't see how you would model the temperature handling parts 
from a generic thermal driver to a generic adc driver for the rk3288-tsadc.

I guess the general temperature irq handling would use iio-triggers? But how 
does the target temperature get into the TSADC_COMP1_INT register.

Also when getting the temperature, Caesar's driver compares it to its trip 
points and sets the next trip point depending on the current temperature 
(passive <-> critical) in rockchip_get_temp.

Maybe there is some completely easy way for this, but currently I don't see 
it.


Heiko

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Arnd Bergmann]

On Thursday 28 August 2014 18:11:43 Heiko St?bner wrote:
> Am Donnerstag, 28. August 2014, 10:37:35 schrieb Eduardo Valentin:
> > > On the driver side, I believe the correct way to deal with this setup
> > > is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
> > > file, and a smaller thermal driver that uses the iio in-kernel interfaces,
> > > ideally one that is independent of the underlying hardware and can
> > > work on any ADC implementation.
> > 
> > Agreed. If you can write such interface and make your driver to work in
> > such way, that would be great.
> 
> But I currently don't see how you would model the temperature handling parts 
> from a generic thermal driver to a generic adc driver for the rk3288-tsadc.
> 
> I guess the general temperature irq handling would use iio-triggers? But how 
> does the target temperature get into the TSADC_COMP1_INT register.
> 
> Also when getting the temperature, Caesar's driver compares it to its trip 
> points and sets the next trip point depending on the current temperature 
> (passive <-> critical) in rockchip_get_temp.
> 
> Maybe there is some completely easy way for this, but currently I don't see 
> it.

Eduardo earlier today replied to an email about a generic driver for
thermal, which was posted in February but hasn't been merged.
See https://lkml.org/lkml/2014/2/5/810

There may be a newer version of this patch, which I haven't found.

	Arnd

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Caesar Wang]

Arnd & Heiko & Eduardo,

OK. Maybe you are right.

This driver should be put into drivers/iio/adc/* ,
Anyway,I will re-edit it ASAP.


? 2014/8/29 0:16, Arnd Bergmann ??:
> On Thursday 28 August 2014 18:11:43 Heiko St?bner wrote:
>> Am Donnerstag, 28. August 2014, 10:37:35 schrieb Eduardo Valentin:
>>>> On the driver side, I believe the correct way to deal with this setup
>>>> is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
>>>> file, and a smaller thermal driver that uses the iio in-kernel interfaces,
>>>> ideally one that is independent of the underlying hardware and can
>>>> work on any ADC implementation.
>>> Agreed. If you can write such interface and make your driver to work in
>>> such way, that would be great.
>> But I currently don't see how you would model the temperature handling parts
>> from a generic thermal driver to a generic adc driver for the rk3288-tsadc.
>>
>> I guess the general temperature irq handling would use iio-triggers? But how
>> does the target temperature get into the TSADC_COMP1_INT register.
>>
>> Also when getting the temperature, Caesar's driver compares it to its trip
>> points and sets the next trip point depending on the current temperature
>> (passive <-> critical) in rockchip_get_temp.
>>
>> Maybe there is some completely easy way for this, but currently I don't see
>> it.
> Eduardo earlier today replied to an email about a generic driver for
> thermal, which was posted in February but hasn't been merged.
> See https://lkml.org/lkml/2014/2/5/810
>
> There may be a newer version of this patch, which I haven't found.
>
> 	Arnd
>
>
>

-- 
Best regards,
Caesar

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Heiko Stübner]

Hi Caesar,

Am Freitag, 29. August 2014, 03:36:36 schrieb Caesar Wang:
> Arnd & Heiko & Eduardo,
> 
> OK. Maybe you are right.
> 
> This driver should be put into drivers/iio/adc/* ,
> Anyway,I will re-edit it ASAP.

I pieced together an example on how this could look, if you need inspiration.

As I've written, the tsadc on the rk3066 is simply another saradc, so it was 
easy to build a usable example with it, which you can find in my 
devel/workbench branch [0].

Things to note, the adc values are converted to voltages instead of the 
"code"-values listed in the TRM [formula: (code * vref_mv)  >> 12)] and the 
temperatures are listed in millikelvin (C+273150) as expected by the pending 
iio-thermal driver.


@Courtney: (not sure how to reply to the old thread from february)
the only issue I found was the unit of the voltages. The binding doc lists 
them as uV, while iio (and the driver itself) expect to use mV.

Otherwise the iio-thermal driver:
Tested-by: Heiko Stuebner <heiko@sntech.de>


Heiko



[0] https://github.com/mmind/linux-rockchip/commits/devel/workbench
(recent commits till "thermal: add generic IIO channel thermal sensor driver")



> ? 2014/8/29 0:16, Arnd Bergmann ??:
> > On Thursday 28 August 2014 18:11:43 Heiko St?bner wrote:
> >> Am Donnerstag, 28. August 2014, 10:37:35 schrieb Eduardo Valentin:
> >>>> On the driver side, I believe the correct way to deal with this setup
> >>>> is to split your driver into a generic
> >>>> drivers/iio/adc/rockchips-tsadc.c
> >>>> file, and a smaller thermal driver that uses the iio in-kernel
> >>>> interfaces,
> >>>> ideally one that is independent of the underlying hardware and can
> >>>> work on any ADC implementation.
> >>> 
> >>> Agreed. If you can write such interface and make your driver to work in
> >>> such way, that would be great.
> >> 
> >> But I currently don't see how you would model the temperature handling
> >> parts from a generic thermal driver to a generic adc driver for the
> >> rk3288-tsadc.
> >> 
> >> I guess the general temperature irq handling would use iio-triggers? But
> >> how does the target temperature get into the TSADC_COMP1_INT register.
> >> 
> >> Also when getting the temperature, Caesar's driver compares it to its
> >> trip
> >> points and sets the next trip point depending on the current temperature
> >> (passive <-> critical) in rockchip_get_temp.
> >> 
> >> Maybe there is some completely easy way for this, but currently I don't
> >> see
> >> it.
> > 
> > Eduardo earlier today replied to an email about a generic driver for
> > thermal, which was posted in February but hasn't been merged.
> > See https://lkml.org/lkml/2014/2/5/810
> > 
> > There may be a newer version of this patch, which I haven't found.
> > 
> > 	Arnd

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[edubezval at gmail.com]

Hello Zhao,

On Thu, Aug 28, 2014 at 9:54 PM, ??? <zyf@rock-chips.com> wrote:
> Hi Heiko?
>
>    The TS-ADC on RK3288 has two component, a tsadc and a tsadc controller.
> The tsadc controller is similar like the thermal manager unit on other SOCs.
> We followed the naming of 3066, but not named as the Thermal Manager.
>
>    Moreover,there is only one set of apb registers to access the tsadc
> controller,and the tsadc is controlled by the tsadc controller,could not
> access directly. If we write a general tsadc driver by accessed tsadc
> controller registers, and it hardly to write a driver for the tsadc
> controller.

As suggested by Arnd, you can use the generic driver as interface
between thermal framework and IIO layer. The driver you are going to
write to your ADC is going to be in the IIO subsystem. The only
difference is that the generic driver would work for any ADC driver in
the IIO subsystem.
https://lkml.org/lkml/2014/2/5/810

In fact, there is already a generic driver. We just need to get it up
to date.  I see some testing has been already done, and results sound
promising.

>
>    So, I do not agree to write a generic adc driver for the rk3288-tsadc.
>
> ________________________________
> Yifeng Zhao
>
> ???? HeikoSt?bner
> ????? 2014-08-29 00:11
> ???? Eduardo Valentin
> ??? Arnd Bergmann; Caesar Wang; rui.zhang; grant.likely; robh+dt;
> linux-kernel; linux-pm; linux-arm-kernel; devicetree; linux-doc; huangtao;
> cf; dianders; dtor; zyw; addy.ke; dmitry.torokhov; zhaoyifeng; linux-iio;
> Jonathan Cameron
> ??? Re: [PATCH v3 1/4] thermal: rockchip: add driver for thermal
>
> Am Donnerstag, 28. August 2014, 10:37:35 schrieb Eduardo Valentin:
>> Ceasar and Arnd,
>>
>> On Thu, Aug 28, 2014 at 10:48:23AM +0200, Arnd Bergmann wrote:
>> > On Thursday 28 August 2014 08:59:19 Caesar Wang wrote:
>> > > Thermal is TS-ADC Controller module supports user-defined mode and
>> > > automatic mode.
>> > >
>> > > User-defined mode refers,TSADC all the control signals entirely by
>> > > software
>> > > writing to register for direct control.
>> > >
>> > > Automaic mode refers to the module automatically poll TSADC output,and
>> > > the results Were checked.
>> > >
>> > > If you find that the temperature High in a period of time, an
>> > > interrupt
>> > > is generated to the processor down-measures taken;if the temperature
>> > > over a period of time High, the resulting TSHUT gave CRU module,let it
>> > > reset the entire chip, or via GPIO give PMIC.
>> > >
>> > > Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
>> > > Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
>> >
>> > Hi Caesar,
>> >
>> > After looking at the driver (last time I only received the patch for
>> > the binding), I have a more general comment:
>> >
>> > This looks like a general-purpose ADC device, not an IP block that is
>> > specific to thermal management. The binding looks ok for that purpose
>> > but should probably be moved into
>> > Documentation/devicetree/bindings/iio/adc/ as a minor change.
>>
>> I agree with Arnd's point here. It makes sense to me to have this driver
>> under the IIO umbrella.
>
> interesting suggestion :-)
>
> I've just taken another look at the registers of the ts-adc on the rk3066
> which is completely different from the rk3288 one. Interestingly the rk3066
> one
> is "just" another saradc IP, so for this one it would really make sense.
>
>
>> > On the driver side, I believe the correct way to deal with this setup
>> > is to split your driver into a generic drivers/iio/adc/rockchips-tsadc.c
>> > file, and a smaller thermal driver that uses the iio in-kernel
>> > interfaces,
>> > ideally one that is independent of the underlying hardware and can
>> > work on any ADC implementation.
>>
>> Agreed. If you can write such interface and make your driver to work in
>> such way, that would be great.
>
> But I currently don't see how you would model the temperature handling parts
> from a generic thermal driver to a generic adc driver for the rk3288-tsadc.
>
> I guess the general temperature irq handling would use iio-triggers? But how
> does the target temperature get into the TSADC_COMP1_INT register.
>
> Also when getting the temperature, Caesar's driver compares it to its trip
> points and sets the next trip point depending on the current temperature
> (passive <-> critical) in rockchip_get_temp.
>
> Maybe there is some completely easy way for this, but currently I don't see
> it.
>
>
> Heiko
>
>



-- 
Eduardo Bezerra Valentin

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Huang Tao]

Dear Eduardo Bezerra Valentin:

? 2014?08?29? 19:39, edubezval at gmail.com ??:
> Hello Zhao,
>
> On Thu, Aug 28, 2014 at 9:54 PM, ??? <zyf@rock-chips.com> wrote:
>> Hi Heiko?
>>
>>    The TS-ADC on RK3288 has two component, a tsadc and a tsadc controller.
>> The tsadc controller is similar like the thermal manager unit on other SOCs.
>> We followed the naming of 3066, but not named as the Thermal Manager.
>>
>>    Moreover,there is only one set of apb registers to access the tsadc
>> controller,and the tsadc is controlled by the tsadc controller,could not
>> access directly. If we write a general tsadc driver by accessed tsadc
>> controller registers, and it hardly to write a driver for the tsadc
>> controller.
> As suggested by Arnd, you can use the generic driver as interface
> between thermal framework and IIO layer. The driver you are going to
> write to your ADC is going to be in the IIO subsystem. The only
> difference is that the generic driver would work for any ADC driver in
> the IIO subsystem.
> https://lkml.org/lkml/2014/2/5/810
>
> In fact, there is already a generic driver. We just need to get it up
> to date.  I see some testing has been already done, and results sound
> promising.
This iio_thermal driver only support get temperature from the ADC IIO
channel.
It dose not support any advanced feature such as configure the
temperature when system should be reset.
So if we adapt it, we will access the register form both TSADC IIO
driver and  thermal driver.
I don't thank this is a good ideal.

In fact, we should ignore the "ADC" stuff. This sensor use ADC internal,
but it is transparent to software, especially in automatic mode.
>
>>    So, I do not agree to write a generic adc driver for the rk3288-tsadc.
>>
>> ________________________________
>> Yifeng Zhao
>>
>>

[PATCH v3 1/4] thermal: rockchip: add driver for thermal

[Jonathan Cameron]

On 29/08/14 13:08, Huang Tao wrote:
> Dear Eduardo Bezerra Valentin:
> 
> ? 2014?08?29? 19:39, edubezval at gmail.com ??:
>> Hello Zhao,
>>
>> On Thu, Aug 28, 2014 at 9:54 PM, ??? <zyf@rock-chips.com> wrote:
>>> Hi Heiko?
>>>
>>>    The TS-ADC on RK3288 has two component, a tsadc and a tsadc controller.
>>> The tsadc controller is similar like the thermal manager unit on other SOCs.
>>> We followed the naming of 3066, but not named as the Thermal Manager.
>>>
>>>    Moreover,there is only one set of apb registers to access the tsadc
>>> controller,and the tsadc is controlled by the tsadc controller,could not
>>> access directly. If we write a general tsadc driver by accessed tsadc
>>> controller registers, and it hardly to write a driver for the tsadc
>>> controller.
>> As suggested by Arnd, you can use the generic driver as interface
>> between thermal framework and IIO layer. The driver you are going to
>> write to your ADC is going to be in the IIO subsystem. The only
>> difference is that the generic driver would work for any ADC driver in
>> the IIO subsystem.
>> https://lkml.org/lkml/2014/2/5/810
>>
>> In fact, there is already a generic driver. We just need to get it up
>> to date.  I see some testing has been already done, and results sound
>> promising.
> This iio_thermal driver only support get temperature from the ADC IIO
> channel.
> It dose not support any advanced feature such as configure the
> temperature when system should be reset.
> So if we adapt it, we will access the register form both TSADC IIO
> driver and  thermal driver.
> I don't thank this is a good ideal.

Interesting bit of functionality.  I agree this doesn't fit overwelmingly well
into an iio consumer driver as things currently stand.

Looking briefly at your code, this is basically a threshold interrupt?
If so then we do have threshold type event handling in IIO (simply termed
events).  The snag is that it is the one area that doesn't currently have
any in kernel interfaces.

Such an interface would be similar to that used for the buffered data access (raw
data stream - we should probably rename that as it isn't always buffered anymore).
The nasty bit (as it was with the buffered interface) is writing a reasonably
efficient demux that can split out the data to those devices that have registered
their interest in it. It would involve some additional code in iio_push_event and
some indirection in the code that controls what events are enabled.
Actually, you could probably skip this an just squirt all events recieved out through
the direct IIO to userspace interface (nothing prevents another process turning
more on anyway!).  We could event for now specify that any in kernel users might
get other events and it is up to them to sanity check them.

We'd also need to add some basic access functions to set limits etc.

I'm afraid the 'events' bit of IIO is one of our least developed elements and is
lagging way behind the work done on the main data flows. It's been on the
list for a while, particularly as we need it to finish separating the
userspace interfaces of IIO from the backend.

So, looking at the wider picture, with a few additions to IIO we can support
some ADC based thermal drivers - whether all of them is a bit dependent on
whether they have weird and wonderful domain specific hardware (which I might
have missed here, but does not seem to be present).

Note this is based on a rather brief scan read so I may well have missed some
important details!
> 
> In fact, we should ignore the "ADC" stuff. This sensor use ADC internal,
> but it is transparent to software, especially in automatic mode.
Is this adc ever used for anything else?  If so, then there is your reason to
go through the pain of a generic driver.

Jonathan

p.s. I'd never seen the driver Arnd highlighted.  Could anyone working on
IIO clients cc linux-iio at vger.kernel.org as it's useful to know what people
are using the interfaces for (particularly as they might change so it is
good to know what is in the pipeline).
>>
>>>    So, I do not agree to write a generic adc driver for the rk3288-tsadc.
>>>
>>> ________________________________
>>> Yifeng Zhao
>>>
>>>
> 
> 

[PATCH v3 2/4] dt-bindings: document Rockchip thermal

[Caesar Wang]

This add the necessary binding documentation for the thermal
found on Rockchip SoCs

Signed-off-by: zhaoyifeng <zyf@rock-chips.com>
Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
---
 .../devicetree/bindings/thermal/rockchip-thermal.txt | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/rockchip-thermal.txt

diff --git a/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
new file mode 100644
index 0000000..1ed4d4c
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
@@ -0,0 +1,20 @@
+* Temperature Sensor ADC (TSADC) on rockchip SoCs
+
+Required properties:
+- compatible: "rockchip,rk3288-tsadc"
+- reg: physical base address of the controller and length of memory mapped
+       region.
+- interrupts: The interrupt number to the cpu. The interrupt specifier format
+	      depends on the interrupt controller.
+- clocks: Must contain an entry for each entry in clock-names.
+- clock-names: Shall be "tsadc" for the converter-clock, and "apb_pclk" for
+	       the peripheral clock.
+
+Example:
+tsadc: tsadc at ff280000 {
+	compatible = "rockchip,rk3288-tsadc";
+	reg = <0xff280000 0x100>;
+	interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>;
+	clock-names = "tsadc", "apb_pclk";
+};
-- 
1.9.1

[PATCH v3 3/4] ARM: dts: add main Thermal info to rk3288

[Caesar Wang]

Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
---
 arch/arm/boot/dts/rk3288.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 36be7bb..3d672e3 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -224,6 +224,17 @@
 		status = "disabled";
 	};
 
+	tsadc: tsadc at ff280000 {
+		compatible = "rockchip,rk3288-tsadc";
+		reg = <0xff280000 0x100>;
+		interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>;
+		clock-names = "tsadc", "apb_pclk";
+		pinctrl-names = "default";
+		pinctrl-1 = <&tsadc_int>;
+		status = "disabled";
+	};
+
 	/* NOTE: ohci at ff520000 doesn't actually work on hardware */
 
 	usb_hsic: usb at ff5c0000 {
@@ -611,5 +622,12 @@
 				rockchip,pins = <5 15 3 &pcfg_pull_none>;
 			};
 		};
+
+		tsadc {
+			tsadc_int: tsadc-int {
+				rockchip,pins = <0 10 RK_FUNC_1 &pcfg_pull_up>;
+			};
+		};
+
 	};
 };
-- 
1.9.1

[PATCH v4 4/4] ARM: dts: enable Thermal on rk3288-evb board

[Caesar Wang]

Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
---
 arch/arm/boot/dts/rk3288-evb.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288-evb.dtsi b/arch/arm/boot/dts/rk3288-evb.dtsi
index 2964370..fe85dde 100644
--- a/arch/arm/boot/dts/rk3288-evb.dtsi
+++ b/arch/arm/boot/dts/rk3288-evb.dtsi
@@ -101,6 +101,13 @@
 	status = "okay";
 };
 
+&tsadc {
+	passive-temp = <80>;
+	critical-temp = <100>;
+	force-shut-temp = <120>;
+	status = "okay";
+};
+
 &pinctrl {
 	buttons {
 		pwrbtn: pwrbtn {
-- 
1.9.1