高通平台QPNP温度报警器分析

Qualcomm QPNP Temperature Alarm

QPNP temperature alarm peripherals are found inside of Qualcomm PMIC chips that
utilize the MSM SPMI implementation.  These peripherals provide an interrupt
signal and status register to identify high PMIC die temperature.

Required properties:
- compatible:      Must be "qcom,qpnp-temp-alarm".
- reg:             Specifies the SPMI address and size for this temperature
    alarm device.
- interrupts:      PMIC temperature alarm interrupt
- label:           A string used as a descriptive name for this thermal device.
    This name should be 19 characters or less.

Required structure:
- A qcom,qpnp-temp-alarm node must be a child of an SPMI node that has specified
   the spmi-slave-container property

Optional properties:
- qcom,channel-num:    VADC channel number associated PMIC DIE_TEMP thermistor.
If no channel is specified, then the die temperature
must be estimated based on the over temperature stage.
- qcom,threshold-set:  Integer value which specifies which set of threshold
temperatures to use for the over temperature stages.
Possible values (x = {stage 1 threshold temperature,
stage 2 threshold temperature,
stage 3 threshold temperature}):
 0 = {105 C, 125 C, 145 C}
 1 = {110 C, 130 C, 150 C}
 2 = {115 C, 135 C, 155 C}