LS1043A Thermal Monitoring Unit

[zhoujianyun19]

I study LS1043A  thermal monitoring ,found LS1043a have two thermal monitoring.

One device:

tmu: tmu@f0000 {
compatible = "fsl,qoriq-tmu";
reg = <0xf0000 0x1000>;
interrupts = <18 2 0 0>;
fsl,tmu-range = <0x000a0000 0x00090026 0x0008004a 0x0001006a>;
fsl,tmu-calibration = <0x00000000 0x00000025
0x00000001 0x00000028
0x00000002 0x0000002d
0x00000003 0x00000031
0x00000004 0x00000036

0x00000005 0x0000003a
0x00000006 0x00000040
0x00000007 0x00000044
0x00000008 0x0000004a
0x00000009 0x0000004f
0x0000000a 0x00000054
0x00010000 0x0000000d
0x00010001 0x00000013
0x00010002 0x00000019
0x00010003 0x0000001f
0x00010004 0x00000025
0x00010005 0x0000002d
0x00010006 0x00000033
0x00010007 0x00000043
0x00010008 0x0000004b
0x00010009 0x00000053
0x00020000 0x00000010
0x00020001 0x00000017
0x00020002 0x0000001f
0x00020003 0x00000029
0x00020004 0x00000031
0x00020005 0x0000003c
0x00020006 0x00000042
0x00020007 0x0000004d
0x00020008 0x00000056
0x00030000 0x00000012
0x00030001 0x0000001d>;
};

Two device :

adt7461@4c {
compatible = "adi,adt7461";
reg = <0x4c>;
};
pca9547@77 {
compatible = "philips,pca9547";
reg = <0x77>;
};

I think one device is CPU built-in temperature detection  ,and two device  is external temperature detection.

Don't know if I understand correctly?

[alexander_yakov · Accepted solution]

Thermal Monitoring Unit is part of LS1043A, please look LS1043A Reference Manual, Chapter 43 for details.

ADT7461 is external 8-pin chip used to read temperature from on-die thermal diode of the processor.

PCA9547 is multiplexer chip for I2C bus.

LS1043A Reference Manual is available for download from LS1043A product page, "Documentation" tab:

QorIQ® Layerscape 1043A|NXP 

Have a great day,
Alexander
TIC

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