64 lines
2.7 KiB
Plaintext
64 lines
2.7 KiB
Plaintext
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Qualcomm's TSENS driver
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The TSENS driver supports reading temperature from sensors across
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the MSM. The driver defaults to support a 10 bit ADC.
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The driver uses the Thermal sysfs framework to provide thermal
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clients the ability to enable/disable the sensors, read trip zones,
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read cool/warm temperature thresholds, set temperature thresholds
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for cool/warm notification and receive notification on temperature
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threshold events.
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TSENS node
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Required properties:
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- compatible : should be "qcom,msm-tsens" for MSM8974 TSENS driver.
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- reg : offset and length of the TSENS registers.
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- reg : offset and length of the QFPROM registers used for storing
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the calibration data for the individual sensors.
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- reg-names : resource names used for the physical address of the TSENS
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registers, the QFPROM efuse primary calibration address region,
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Should be "tsens_physical" for physical address of the TSENS,
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"tsens_eeprom_physical" for physical address where primary
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calibration data is stored. This includes the backup
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calibration address region if TSENS calibration data is stored
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in the region.
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- interrupts : TSENS interrupt for cool/warm temperature threshold.
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- qcom,sensors : Total number of available Temperature sensors for TSENS.
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- qcom,slope : One point calibration characterized slope data for each
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sensor used to compute the offset. Slope is represented
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as ADC code/DegC and the value is multipled by a factor
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of 1000.
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- qcom,calib-mode : Calibration masks to use to abstract the offset data from efuse.
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Select from the following strings.
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"fuse_map1" : Used for 8974/9x25 fuse calibration map.
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"fuse_map2" : Used for 8x26 fuse calibration map.
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"fuse_map3" : Used for 8x10 fuse calibration map.
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Optional properties:
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- qcom,calibration-less-mode : If present the pre-characterized data for offsets
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are used else it defaults to use calibration data from QFPROM.
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- qcom,tsens-local-init : If the flag is present the TSENS control registers are
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initialized. If the boot configures the control register there is
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no need to re-initialize them. The control registers are also
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under a secure domain which can prevent them from being initialized
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locally.
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- qcom,sensor-id : If the flag is present map the TSENS sensors based on the
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remote sensors that are enabled in HW. Ensure the mapping is not
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more than the number of supported sensors.
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Example:
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tsens@fc4a8000 {
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compatible = "qcom,msm-tsens";
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reg = <0xfc4a8000 0x2000>,
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<0xfc4b8000 0x1000>;
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reg-names = "tsens_physical",
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"tsens_eeprom_physical";
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interrupts = <0 184 0>;
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qcom,calibration-less-mode;
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qcom,sensors = <11>;
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qcom,slope = <3200 3200 3200 3200 3200 3200 3200 3200 3200
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3200>;
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qcom,calib-mode = "fuse_map1";
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};
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