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dt-bindings:iio:adc:adi,ad7768-1 yaml conversion
Fairly straight conversion. The one oddity in the original binding is that spi-cpha and spi-cpol were not marked as required, but were in the example. Looking at the datasheet, there isn't any documented flexibility in the possible SPI modes, so I have moved these to requires. For spi-max-frequency I have gone the other way. I absolutely agree that it is good to specify this in the dt-binding, but it's not strictly required. As Stefan's email is bouncing I have gone with Michael as maintainer of this one as it falls under the ADI catch all entry in MAINTAINERS. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Rob Herring <robh@kernel.org> Cc: Michael Hennerich <Michael.Hennerich@analog.com> Link: https://lore.kernel.org/r/20200909175946.395313-16-jic23@kernel.org
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Analog Devices AD7768-1 ADC device driver
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Required properties for the AD7768-1:
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- compatible: Must be "adi,ad7768-1"
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- reg: SPI chip select number for the device
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- spi-max-frequency: Max SPI frequency to use
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see: Documentation/devicetree/bindings/spi/spi-bus.txt
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- clocks: phandle to the master clock (mclk)
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see: Documentation/devicetree/bindings/clock/clock-bindings.txt
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- clock-names: Must be "mclk".
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- interrupts: IRQ line for the ADC
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see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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- vref-supply: vref supply can be used as reference for conversion
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- adi,sync-in-gpios: must be the device tree identifier of the SYNC-IN pin. Enables
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synchronization of multiple devices that require simultaneous sampling.
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A pulse is always required if the configuration is changed in any way, for example
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if the filter decimation rate changes. As the line is active low, it should
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be marked GPIO_ACTIVE_LOW.
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Optional properties:
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- reset-gpios : GPIO spec for the RESET pin. If specified, it will be asserted during
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driver probe. As the line is active low, it should be marked GPIO_ACTIVE_LOW.
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Example:
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adc@0 {
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compatible = "adi,ad7768-1";
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reg = <0>;
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spi-max-frequency = <2000000>;
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spi-cpol;
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spi-cpha;
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vref-supply = <&adc_vref>;
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interrupts = <25 IRQ_TYPE_EDGE_RISING>;
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interrupt-parent = <&gpio>;
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adi,sync-in-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
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reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
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clocks = <&ad7768_mclk>;
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clock-names = "mclk";
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};
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/adc/adi,ad7768-1.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Analog Devices AD7768-1 ADC device driver
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maintainers:
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- Michael Hennerich <michael.hennerich@analog.com>
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description: |
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Datasheet at:
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https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
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properties:
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compatible:
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const: adi,ad7768-1
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reg:
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maxItems: 1
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clocks:
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maxItems: 1
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clock-names:
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const: mclk
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interrupts:
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maxItems: 1
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vref-supply:
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description:
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ADC reference voltage supply
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adi,sync-in-gpios:
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description:
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Enables synchronization of multiple devices that require simultaneous
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sampling. A pulse is always required if the configuration is changed
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in any way, for example if the filter decimation rate changes.
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As the line is active low, it should be marked GPIO_ACTIVE_LOW.
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reset-gpios:
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maxItems: 1
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spi-max-frequency: true
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spi-cpol: true
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spi-cpha : true
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"#io-channel-cells":
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const: 1
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required:
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- compatible
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- reg
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- clocks
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- clock-names
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- vref-supply
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- spi-cpol
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- spi-cpha
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- adi,sync-in-gpios
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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#include <dt-bindings/gpio/gpio.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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adc@0 {
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compatible = "adi,ad7768-1";
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reg = <0>;
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spi-max-frequency = <2000000>;
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spi-cpol;
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spi-cpha;
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vref-supply = <&adc_vref>;
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interrupts = <25 IRQ_TYPE_EDGE_RISING>;
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interrupt-parent = <&gpio>;
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adi,sync-in-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
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reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
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clocks = <&ad7768_mclk>;
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clock-names = "mclk";
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};
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};
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...
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