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Date: Tue, 26 Mar 2013 17:04:01 +0530
From: Amit Daniel Kachhap <amit.daniel@...sung.com>
To: linux-pm@...r.kernel.org
Cc: Thomas Abraham <thomas.abraham@...aro.org>,
Zhang Rui <rui.zhang@...el.com>,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
amit.kachhap@...il.com, Kukjin Kim <kgene.kim@...sung.com>
Subject: [PATCH 8/9] thermal: exynos: Parse the platform data from the device tree.
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@...sung.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@...118 {
+ 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
--
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