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dt-bindings:iio:adc:renesas,rcar-gyroadc: txt to yaml conversion.
This is a somewhat unusual device, in that it effectively does spi offload. That means that it doesn't act as a full SPI master, but supports some functionality. As such it supports a subset of specific SPI ADCs. There is potential for a future clash in bindings, but as these are simple devices hopefully that will not occur. One addition to this from testing it against existing dts files was to add a resets property. This is specified in arch/arm/boot/dts/r8a7791.dtsi If it's the dtsi that is wrong and not the binding doc, then we can fix that instead. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Rob Herring <robh@kernel.org> Cc: Marek Vasut <marek.vasut+renesas@gmail.com> Link: https://lore.kernel.org/r/20201031184854.745828-31-jic23@kernel.org
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Jonathan Cameron
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* Renesas R-Car GyroADC device driver
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The GyroADC block is a reduced SPI block with up to 8 chipselect lines,
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which supports the SPI protocol of a selected few SPI ADCs. The SPI ADCs
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are sampled by the GyroADC block in a round-robin fashion and the result
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presented in the GyroADC registers.
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Required properties:
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- compatible: Should be "<soc-specific>", "renesas,rcar-gyroadc".
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The <soc-specific> should be one of:
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renesas,r8a7791-gyroadc - for the GyroADC block present
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in r8a7791 SoC
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renesas,r8a7792-gyroadc - for the GyroADC with interrupt
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block present in r8a7792 SoC
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- reg: Address and length of the register set for the device
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- clocks: References to all the clocks specified in the clock-names
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property as specified in
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Documentation/devicetree/bindings/clock/clock-bindings.txt.
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- clock-names: Shall contain "fck". The "fck" is the GyroADC block clock.
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- power-domains: Must contain a reference to the PM domain, if available.
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- #address-cells: Should be <1> (setting for the subnodes) for all ADCs
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except for "fujitsu,mb88101a". Should be <0> (setting for
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only subnode) for "fujitsu,mb88101a".
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- #size-cells: Should be <0> (setting for the subnodes)
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Sub-nodes:
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You must define subnode(s) which select the connected ADC type and reference
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voltage for the GyroADC channels.
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Required properties for subnodes:
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- compatible: Should be either of:
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"fujitsu,mb88101a"
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- Fujitsu MB88101A compatible mode,
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12bit sampling, up to 4 channels can be sampled in
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round-robin fashion. One Fujitsu chip supplies four
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GyroADC channels with data as it contains four ADCs
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on the chip and thus for 4-channel operation, single
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MB88101A is required. The Cx chipselect lines of the
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MB88101A connect directly to two CHS lines of the
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GyroADC, no demuxer is required. The data out line
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of each MB88101A connects to a shared input pin of
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the GyroADC.
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"ti,adcs7476" or "ti,adc121" or "adi,ad7476"
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- TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode,
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15bit sampling, up to 8 channels can be sampled in
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round-robin fashion. One TI/ADI chip supplies single
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ADC channel with data, thus for 8-channel operation,
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8 chips are required. A 3:8 chipselect demuxer is
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required to connect the nCS line of the TI/ADI chips
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to the GyroADC, while MISO line of each TI/ADI ADC
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connects to a shared input pin of the GyroADC.
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"maxim,max1162" or "maxim,max11100"
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- Maxim MAX1162 / Maxim MAX11100 compatible mode,
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16bit sampling, up to 8 channels can be sampled in
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round-robin fashion. One Maxim chip supplies single
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ADC channel with data, thus for 8-channel operation,
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8 chips are required. A 3:8 chipselect demuxer is
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required to connect the nCS line of the MAX chips
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to the GyroADC, while MISO line of each Maxim ADC
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connects to a shared input pin of the GyroADC.
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- reg: Should be the number of the analog input. Should be present
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for all ADCs except "fujitsu,mb88101a".
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- vref-supply: Reference to the channel reference voltage regulator.
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Example:
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vref_max1162: regulator-vref-max1162 {
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compatible = "regulator-fixed";
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regulator-name = "MAX1162 Vref";
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regulator-min-microvolt = <4096000>;
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regulator-max-microvolt = <4096000>;
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};
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adc@e6e54000 {
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compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc";
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reg = <0 0xe6e54000 0 64>;
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clocks = <&mstp9_clks R8A7791_CLK_GYROADC>;
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clock-names = "fck";
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power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
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pinctrl-0 = <&adc_pins>;
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pinctrl-names = "default";
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#address-cells = <1>;
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#size-cells = <0>;
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adc@0 {
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reg = <0>;
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compatible = "maxim,max1162";
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vref-supply = <&vref_max1162>;
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};
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adc@1 {
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reg = <1>;
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compatible = "maxim,max1162";
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vref-supply = <&vref_max1162>;
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};
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};
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@ -0,0 +1,143 @@
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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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$id: http://devicetree.org/schemas/iio/adc/renesas,rcar-gyroadc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Renesas R-Car GyroADC
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maintainers:
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- Marek Vasut <marek.vasut+renesas@gmail.com>
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description: |
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The GyroADC block is a reduced SPI block with up to 8 chipselect lines,
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which supports the SPI protocol of a selected few SPI ADCs. The SPI ADCs
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are sampled by the GyroADC block in a round-robin fashion and the result
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presented in the GyroADC registers.
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The ADC bindings should match with that of the devices connected to a
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full featured SPI bus.
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properties:
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compatible:
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items:
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- enum:
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- renesas,r8a7791-gyroadc
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- renesas,r8a7792-gyroadc
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- const: renesas,rcar-gyroadc
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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: fck
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power-domains: true
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resets: true
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"#address-cells":
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const: 1
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"#size-cells":
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const: 0
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additionalProperties: false
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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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- "#address-cells"
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- "#size-cells"
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patternProperties:
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"@[0-7]$":
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type: object
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properties:
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compatible:
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description: |
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fujitsu,mb88101a
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- Fujitsu MB88101A compatible mode,
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12bit sampling, up to 4 channels can be sampled in round-robin
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fashion. One Fujitsu chip supplies four GyroADC channels with
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data as it contains four ADCs on the chip and thus for 4-channel
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operation, single MB88101A is required. The Cx chipselect lines
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of the MB88101A connect directly to two CHS lines of the GyroADC,
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no demuxer is required. The data out line of each MB88101A
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connects to a shared input pin of the GyroADC.
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ti,adcs7476 or ti,adc121 or adi,ad7476
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- TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode, 15bit
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sampling, up to 8 channels can be sampled in round-robin
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fashion. One TI/ADI chip supplies single ADC channel with data,
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thus for 8-channel operation, 8 chips are required.
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A 3:8 chipselect demuxer is required to connect the nCS line
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of the TI/ADI chips to the GyroADC, while MISO line of each
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TI/ADI ADC connects to a shared input pin of the GyroADC.
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maxim,max1162 or maxim,max11100
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- Maxim MAX1162 / Maxim MAX11100 compatible mode, 16bit sampling,
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up to 8 channels can be sampled in round-robin fashion. One
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Maxim chip supplies single ADC channel with data, thus for
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8-channel operation, 8 chips are required.
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A 3:8 chipselect demuxer is required to connect the nCS line
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of the MAX chips to the GyroADC, while MISO line of each Maxim
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ADC connects to a shared input pin of the GyroADC.
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enum:
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- adi,7476
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- fujitsu,mb88101a
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- maxim,max1162
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- maxim,max11100
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- ti,adcs7476
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- ti,adc121
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reg:
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minimum: 0
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maximum: 7
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vref-supply: true
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additionalProperties: false
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required:
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- compatible
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- reg
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- vref-supply
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examples:
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- |
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#include <dt-bindings/clock/r8a7791-clock.h>
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#include <dt-bindings/power/r8a7791-sysc.h>
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soc {
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#address-cells = <2>;
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#size-cells = <2>;
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adc@e6e54000 {
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compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc";
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reg = <0 0xe6e54000 0 64>;
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clocks = <&mstp9_clks R8A7791_CLK_GYROADC>;
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clock-names = "fck";
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power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
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pinctrl-0 = <&adc_pins>;
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pinctrl-names = "default";
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#address-cells = <1>;
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#size-cells = <0>;
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adc@0 {
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reg = <0>;
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compatible = "maxim,max1162";
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vref-supply = <&vref_max1162>;
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};
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adc@1 {
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reg = <1>;
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compatible = "maxim,max1162";
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vref-supply = <&vref_max1162>;
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};
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};
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};
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...
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