Maxim thermocouple support
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* https://datasheets.maximintegrated.com/en/ds/MAX6675.pdf
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* https://datasheets.maximintegrated.com/en/ds/MAX31855.pdf
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Required properties:
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- compatible: must be "maxim,max31855" or "maxim,max6675"
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- reg: SPI chip select number for the device
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- spi-max-frequency: must be 4300000
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- spi-cpha: must be defined for max6675 to enable SPI mode 1
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Refer to spi/spi-bus.txt for generic SPI slave bindings.
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Example:
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max31855@0 {
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compatible = "maxim,max31855";
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reg = <0>;
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spi-max-frequency = <4300000>;
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};
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