[PATCH 8/9] thermal: exynos: Parse the platform data from the device tree.

[Amit Daniel Kachhap <amit.daniel@samsung.com>]

This patch adds code to parse the DT based platform data like threshold temp,
sensor configuration parameters like gain, reference voltages, calibration
modes etc.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
---
 .../bindings/thermal/exynos5440-thermal.txt        |   93 ++++++++++++++++++++
 drivers/thermal/samsung/exynos5440_thermal.c       |    5 +-
 drivers/thermal/samsung/exynos_common.c            |   92 +++++++++++++++++++
 drivers/thermal/samsung/exynos_common.h            |    2 +
 4 files changed, 189 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/thermal/exynos5440-thermal.txt

diff --git a/Documentation/devicetree/bindings/thermal/exynos5440-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos5440-thermal.txt
new file mode 100644
index 0000000..1ad2dee
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/exynos5440-thermal.txt
@@ -0,0 +1,93 @@
+
+Exynos5440 TMU driver
+-------------------
+
+Exynos5440 SoC Thermal Sensor driver for CPU temperature measurement and
+performing cooling actions.
+
+Required properties:
+- interrupts: Interrupt to know the threshold change interrupts.
+- clocks: phandle of the clock from common clock binding. More description can
+	be found in Documentation/devicetree/bindings/clock/clock-bindings.txt.
+- clock-name: clock name as used in the clock fetch.
+- tmu-ctrl-data: phandle of the TMU controller configuration data. Its member
+	description is shown below,
+- gain: A factor describing the gain of amplifier. The value varies between
+	0-15.
+- reference-voltage: A factor describing the reference volt to amplifier. The
+	value varies between 0-31.
+- noise-cancel-mode: This value selects thermal tripping mode. The possible
+	values can be,
+		0: Use current temp.
+		4: Use current temp and past 4 temp values.
+		5: Use current temp and past 8 temp values.
+		6: Use current temp and past 12 temp values.
+		7: Use current temp and past 16 temp values.
+-cal-type: This value selects temperature calibration mode. The possible values
+	can be,
+		0: No calibration.
+		1: 1 point trimming method at 25 C.
+		2: 1 point trimming method at 85 C.
+		3: 2 point trimming method.
+-cal-mode: This value selects hw/sw mode calibration. The possible values can be,
+		0: Software calibration.
+		1: Hardware calibration.
+
+Optional properties:
+-efuse-value: This value should be used when the controller does not contain
+	valid fused temperature data needed for calibration. This is a 16 bit
+	value.
+-threshold-falling: This value defines the falling threshold when it is added to
+	trip threshold. If this value is not supplied then rising and falling
+	threshold are same.
+
+-trip@: This node is added to define the trip properties. The trip members are
+	shown below,
+-trip: This field defines the trip ID. Exynos5440 has 5 trip ID.
+-trigger-temp: Temperature at which threshold trigger is fired. Its unit is
+	celsius.
+-type: This denotes the type of trigger. The possible values are,
+	0: active trip type
+	1: critical
+	2: hw system trip
+-frequency-max: cpu frequency when this trip is reached.
+
+Example:
+--------
+	tmu_ctrl_info: tmu-ctrl-info {
+		gain = <8>;
+		reference-voltage = <16>;
+		noise-cancel-mode = <4>;
+		cal-type = <0>;
+		cal-mode = <0>;
+		efuse-value = <0xabcd>;
+		threshold-falling = <5>;
+
+		trip@0{
+			trip = <0>;
+			trigger-temp = <80>;
+			type = <0>;
+			frequency-max = <1200000>;
+		};
+
+		trip@3{
+			trip = <3>;
+			trigger-temp = <110>;
+			type = <1>;
+		};
+
+		trip@4{
+			trip = <4>;
+			trigger-temp = <120>;
+			type = <2>;
+		};
+	};
+
+	tmuctrl_0: tmuctrl@160118 {
+		compatible = "samsung,exynos5440-tmu";
+		reg = <0x160118 0x300>;
+		interrupts = <0 58 0>;
+		clocks = <&clock 8>;
+		clock-names = "tmu_apbif";
+		tmu-ctrl-data = <&tmu_ctrl_info>;
+	};
diff --git a/drivers/thermal/samsung/exynos5440_thermal.c b/drivers/thermal/samsung/exynos5440_thermal.c
index a3c75d3..c140e8c 100644
--- a/drivers/thermal/samsung/exynos5440_thermal.c
+++ b/drivers/thermal/samsung/exynos5440_thermal.c
@@ -564,9 +564,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	pdata = (struct exynos_tmu_platform_data *)
-				platform_get_device_id(pdev)->driver_data;
-	if (!pdata) {
+	pdata = exynos_parse_tmu_dt_data(pdev);
+	if (!pdata || IS_ERR(pdata)) {
 		dev_err(&pdev->dev, "No platform init data supplied.\n");
 		return -ENODEV;
 	}
diff --git a/drivers/thermal/samsung/exynos_common.c b/drivers/thermal/samsung/exynos_common.c
index 0c0098d..345284c 100644
--- a/drivers/thermal/samsung/exynos_common.c
+++ b/drivers/thermal/samsung/exynos_common.c
@@ -27,7 +27,9 @@
 #include <linux/kernel.h>
 #include <linux/kobject.h>
 #include <linux/mutex.h>
+#include <linux/of.h>
 #include <linux/platform_data/exynos_thermal.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/thermal.h>
 #include "exynos_common.h"
@@ -421,3 +423,93 @@ void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
 	kfree(th_zone);
 	pr_info("Exynos: Kernel Thermal[%d] management unregistered\n", id);
 }
+
+struct exynos_tmu_platform_data *
+	exynos_parse_tmu_dt_data(struct platform_device *pdev)
+{
+	int ret;
+	struct device_node *np, *cn;
+	struct exynos_tmu_platform_data *pdata;
+	unsigned int val, trip;
+
+	if (!pdev->dev.of_node)
+		return ERR_PTR(-ENODEV);
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	np = of_parse_phandle(pdev->dev.of_node, "tmu-ctrl-data", 0);
+	if (!np) {
+		ret = -ENODEV;
+		goto err_parse_dt;
+	}
+
+	/* Parse compulsory parameters */
+	ret = of_property_read_u32(np, "gain", &val);
+	if (ret)
+		goto err_parse_dt;
+	pdata->gain = val;
+
+	ret = of_property_read_u32(np, "reference-voltage", &val);
+	if (ret)
+		goto err_parse_dt;
+	pdata->reference_voltage = val;
+
+	ret = of_property_read_u32(np, "noise-cancel-mode", &val);
+	if (ret)
+		goto err_parse_dt;
+	pdata->noise_cancel_mode = val;
+
+	ret = of_property_read_u32(np, "cal-type", &val);
+	if (ret)
+		goto err_parse_dt;
+	pdata->cal_type = val;
+
+	ret = of_property_read_u32(np, "cal-mode", &val);
+	if (ret)
+		goto err_parse_dt;
+	pdata->cal_mode = val;
+
+	/* Parse optional parameters */
+	ret = of_property_read_u32(np, "efuse-value", &val);
+	if (!ret)
+		pdata->efuse_value = val;
+
+	ret = of_property_read_u32(np, "threshold-falling", &val);
+	if (!ret)
+		pdata->threshold_falling = val;
+
+	for (cn = NULL ; (cn = of_get_next_child(np, cn));) {
+		/* Parse compulsory child parameters */
+		ret = of_property_read_u32(cn, "trip", &trip);
+		if (ret || trip > MAX_TRIP)
+			goto err_parse_dt;
+
+		ret = of_property_read_u32(cn, "trigger-temp", &val);
+		if (ret || !val)
+			goto err_parse_dt;
+		pdata->trigger_levels[trip] = val;
+
+		ret = of_property_read_u32(cn, "type", &val);
+		if (ret || val > HW_TRIP)
+			goto err_parse_dt;
+		pdata->trigger_type[trip] = val;
+
+		/* Parse optional child parameters */
+		ret = of_property_read_u32(cn, "frequency-max", &val);
+		if (!ret && val) {
+			pdata->freq_tab[pdata->freq_tab_count].freq_clip_max
+				= val;
+			pdata->freq_tab[pdata->freq_tab_count].temp_level
+				= pdata->trigger_levels[trip];
+			pdata->freq_tab_count++;
+		}
+		pdata->trigger_enable[trip] = true;
+	}
+	return pdata;
+
+err_parse_dt:
+	dev_err(&pdev->dev, "Parsing TMU device tree data error.\n");
+	return ERR_PTR(ret);
+}
diff --git a/drivers/thermal/samsung/exynos_common.h b/drivers/thermal/samsung/exynos_common.h
index 453e09a..5ca640b 100644
--- a/drivers/thermal/samsung/exynos_common.h
+++ b/drivers/thermal/samsung/exynos_common.h
@@ -69,4 +69,6 @@ void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf);
 int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);
 void exynos_report_trigger(struct thermal_sensor_conf *sensor_conf);
 int exynos_get_frequency_level(unsigned int cpu, unsigned int freq);
+struct exynos_tmu_platform_data *
+	exynos_parse_tmu_dt_data(struct platform_device *pdev);
 #endif /* _LINUX_EXYNOS_COMMON_H */
-- 
1.7.1