Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
dt-bindings:iio:temperature:maxim_thermocouple.txt to maxim,max31855k.yaml
Given we already have another maxim thermocouple driver that isn't
covered by this binding it seems a better idea to chose to name it
after a specific part.
I added an additional example for the maxim,max6755 to illustrate
the need for spi-cpha for that part.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20201031134110.724233-29-jic23@kernel.org
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Documentation/devicetree/bindings/iio/temperature/maxim,max31855k.yaml
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Documentation/devicetree/bindings/iio/temperature/maxim,max31855k.yaml
···
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/temperature/maxim,max31855k.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Maxim MAX31855 and similar thermocouples
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maintainers:
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- Matt Ranostay <matt.ranostay@konsulko.com>
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description: |
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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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properties:
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compatible:
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description:
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The generic maxim,max31855 compatible is deprecated in favour of
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the thermocouple type specific variants.
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enum:
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- maxim,max6675
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- maxim,max31855
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- maxim,max31855k
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- maxim,max31855j
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- maxim,max31855n
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- maxim,max31855s
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- maxim,max31855t
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- maxim,max31855e
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- maxim,max31855r
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reg:
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maxItems: 1
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spi-max-frequency: true
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spi-cpha: true
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required:
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- compatible
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- reg
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+
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allOf:
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- if:
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properties:
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compatible:
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contains:
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enum:
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- maxim,max6675
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then:
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required:
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- spi-cpha
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else:
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properties:
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spi-cpha: false
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additionalProperties: false
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examples:
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- |
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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temp-sensor@0 {
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compatible = "maxim,max31855k";
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reg = <0>;
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spi-max-frequency = <4300000>;
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};
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temp-sensor@1 {
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compatible = "maxim,max6675";
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reg = <1>;
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spi-max-frequency = <4300000>;
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spi-cpha;
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};
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};
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...
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Documentation/devicetree/bindings/iio/temperature/maxim_thermocouple.txt
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Documentation/devicetree/bindings/iio/temperature/maxim_thermocouple.txt
···
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Maxim thermocouple support
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-
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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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-
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Required properties:
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-
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- compatible: must be "maxim,max6675" or one of the following:
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"maxim,max31855k", "maxim,max31855j", "maxim,max31855n",
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"maxim,max31855s", "maxim,max31855t", "maxim,max31855e",
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"maxim,max31855r"; the generic "max,max31855" is deprecated.
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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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-
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Refer to spi/spi-bus.txt for generic SPI slave bindings.
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-
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Example:
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max31855@0 {
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compatible = "maxim,max31855k";
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reg = <0>;
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spi-max-frequency = <4300000>;
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};