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Mon, 2 Jun 2025 07:36:30 -0400 From: Marcelo Schmitt To: , , , CC: , , , , , , , , , , , Subject: [PATCH v4 01/11] dt-bindings: iio: adc: Add AD4170 Date: Mon, 2 Jun 2025 08:36:24 -0300 Message-ID: <187e038cb9e7dbe3991149885cb0a4b30376660c.1748829860.git.marcelo.schmitt@analog.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjAyMDEwMCBTYWx0ZWRfX79P4T47otAIn wB4aft0JbC0IeHx1ZcyxIAnD/lw/JHKT27hhzmipzbb0xhlsPkznupydvALhzw9oD0l7uDHmj/p N5/LJpQeQ6bChLu8v/ufWpxYJW6Aphiz8S+6XfFYyX9waBQgS6BrvchqRSsAPBKKWvNKgI817VG iYnPgAMCg6TrL4QwepGQ0C1zRxU5zWkZWk57/laF2fh/HiZF/tONj9ITRZB4biLT2wL6D3ZQIw+ 8QehP+fJ6shku7xl9DE97Cpt1f1QGcysCJ0kYRZa2PWVni6CSQbLLiCstDCLIc9OBK14efmlbZq HmkIngSM/5YMbL0FXyixDD23aJgySlgt7zeGF/Clx02Jkv73/AyNTCGQFek34imT7mtPWkHWj6R j3ERquNOMFOuRBi85Vpf7Hei9b8baLwKvTWNKAvYmuyjeH2zTdaiu2N8arhSlFIu9Xo6jV4E X-Proofpoint-ORIG-GUID: k2jJijchhRYSF5d3kE3uRRpb3c750nl5 X-Proofpoint-GUID: k2jJijchhRYSF5d3kE3uRRpb3c750nl5 X-Authority-Analysis: v=2.4 cv=S5XZwJsP c=1 sm=1 tr=0 ts=683d8ccf cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=gAnH3GRIAAAA:8 a=gEfo2CItAAAA:8 a=VwQbUJbxAAAA:8 a=OZsC-xN9Pi8B2StoONIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=sptkURWiP4Gy88Gu7hUp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-02_05,2025-05-30_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 priorityscore=1501 phishscore=0 malwarescore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505160000 definitions=main-2506020100 Add device tree documentation for AD4170 and similar sigma-delta ADCs. The AD4170 is a 24-bit, multichannel, sigma-delta ADC. Signed-off-by: Marcelo Schmitt --- Change log v3 -> v4 - Dropped sensor-node and most of defs. - Updated external sensor props to have similar name and type of adi,ad4130= ones. - Added constraints to properties related to external bridge sensor excitat= ion. Some explanation about the constraints to weigh scale sensor types. The predefined ACX1, ACX1 negated, ACX2, and ACX2 negated signals are used = to AC excite external bridge circuits and are output on GPIO2, GPIO0, GPIO3, and GPIO1, respectively. If only two pins are specified for AC excitation, only= ACX1 and ACX2 (GPIO2 and GPIO3) are used. Because of that, if AC excitation is specified/requested, then those specific GPIO pins must be used with the br= idge. Otherwise, the bridge won't get properly excited and we also cannot guarant= ee to avoid short-circuit conditions since the level set to GPIOs to DC excite the bridge depends on the GPIO number. See AD4170 datasheet Figure 113 Weigh Sc= ale (AC Excitation) for the reference circuit diagram. Link: https://www.analog.com/media/en/technical-documentation/data-sheets/a= d4170-4.pdf#unique_149_Connect_42_ID10354 .../bindings/iio/adc/adi,ad4170.yaml | 543 ++++++++++++++++++ MAINTAINERS | 7 + 2 files changed, 550 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4170.ya= ml diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4170.yaml b/Do= cumentation/devicetree/bindings/iio/adc/adi,ad4170.yaml new file mode 100644 index 000000000000..87b6e821fdb8 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4170.yaml @@ -0,0 +1,543 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad4170.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD4170 and similar Analog to Digital Converters + +maintainers: + - Marcelo Schmitt + +description: | + Analog Devices AD4170 series of Sigma-delta Analog to Digital Converters. + Specifications can be found at: + https://www.analog.com/media/en/technical-documentation/data-sheets/ad= 4170-4.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad= 4190-4.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad= 4195-4.pdf + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +$defs: + reference-buffer: + description: | + Enable precharge buffer, full buffer, or skip reference buffering of + the positive/negative voltage reference. Because the output impedance + of the source driving the voltage reference inputs may be dynamic, RC + combinations of those inputs can cause DC gain errors if the referen= ce + inputs go unbuffered into the ADC. Enable reference buffering if the + provided reference source has dynamic high impedance output. Note the + absolute voltage allowed on REFINn+ and REFINn- inputs is from + AVSS - 50 mV to AVDD + 50 mV when the reference buffers are disabled + but narrows to AVSS to AVDD when reference buffering is enabled or in + precharge mode. The valid options for this property are: + 0: Reference precharge buffer. + 1: Full reference buffering. + 2: Bypass reference buffers (buffering disabled). + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2] + default: 1 + + excitation-pin: + description: | + Analog input to apply excitation current to while the channel + is active. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 20 + +properties: + compatible: + enum: + - adi,ad4170 + - adi,ad4190 + - adi,ad4195 + + avss-supply: + description: + Reference voltage supply for AVSS. If provided, describes the magnit= ude + (absolute value) of the negative voltage supplied to the AVSS pin. S= ince + AVSS must be =E2=88=922.625V minimum and 0V maximum, the declared su= pply voltage + must be between 0 and 2.65V. If not provided, AVSS is assumed to be = at + system ground (0V). + + avdd-supply: + description: + A supply of 4.75V to 5.25V relative to AVSS that powers the chip (AV= DD). + + iovdd-supply: + description: 1.7V to 5.25V reference supply to the serial interface (I= OVDD). + + refin1p-supply: + description: REFIN+ supply that can be used as reference for conversio= n. + + refin1n-supply: + description: REFIN- supply that can be used as reference for conversio= n. If + provided, describes the magnitude (absolute value) of the negative v= oltage + supplied to the REFIN- pin. + + refin2p-supply: + description: REFIN2+ supply that can be used as reference for conversi= on. + + refin2n-supply: + description: REFIN2- supply that can be used as reference for conversi= on. If + provided, describes the magnitude (absolute value) of the negative v= oltage + supplied to the REFIN2- pin. + + spi-cpol: true + + spi-cpha: true + + interrupts: + description: + Interrupt for signaling the completion of conversion results. The da= ta + ready signal (RDY) used as interrupt is by default provided on the S= DO + pin. Alternatively, it can be provided on the DIG_AUX1 pin in which = case + the chip disables the RDY function on SDO. Thus, there can be only o= ne + data ready interrupt enabled at a time. + maxItems: 1 + + interrupt-names: + description: + Specify which pin should be configured as Data Ready interrupt. + enum: + - sdo + - dig_aux1 + maxItems: 1 + default: sdo + + clocks: + maxItems: 1 + description: + Optional external clock source. Can specify either an external clock= or + external crystal. + + clock-names: + enum: + - ext-clk + - xtal + default: ext-clk + + '#clock-cells': + const: 0 + + clock-output-names: + maxItems: 1 + + gpio-controller: true + + "#gpio-cells": + const: 2 + description: | + The first cell is for the GPIO number: 0 to 3. + The second cell takes standard GPIO flags. + + ldac-gpios: + description: + GPIO connected to DIG_AUX2 pin to be used as LDAC toggle to control = the + transfer of data from the DAC_INPUT_A register to the DAC. + maxItems: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + adi,vbias-pins: + description: Analog inputs to apply a voltage bias of (AVDD =E2=88=92 = AVSS) / 2 to. + $ref: /schemas/types.yaml#/definitions/uint32-array + minItems: 1 + maxItems: 9 + items: + minimum: 0 + maximum: 8 + +allOf: + # Some devices don't have integrated DAC + - if: + properties: + compatible: + contains: + enum: + - adi,ad4190 + - adi,ad4195 + then: + properties: + ldac-gpios: false + + # If an external clock is set, the internal clock cannot go out and vice= versa + - oneOf: + - required: [clocks] + properties: + '#clock-cells': false + - required: ['#clock-cells'] + properties: + clocks: false + +patternProperties: + "^channel@[0-9a-f]$": + $ref: /schemas/iio/adc/adc.yaml# + unevaluatedProperties: false + description: + Represents the external channels which are connected to the ADC. + + properties: + reg: + description: + The channel number. + minimum: 0 + maximum: 15 + + diff-channels: + description: | + This property is used for defining the inputs of a differential + voltage channel. The first value is the positive input and the s= econd + value is the negative input of the channel. + + Besides the analog input pins AIN0 to AIN8, there are special in= puts + that can be selected with the following values: + 17: Internal temperature sensor + 18: (AVDD-AVSS)/5 + 19: (IOVDD-DGND)/5 + 20: DAC output + 21: ALDO + 22: DLDO + 23: AVSS + 24: DGND + 25: REFIN+ + 26: REFIN- + 27: REFIN2+ + 28: REFIN2- + 29: REFOUT + For the internal temperature sensor, use the input number for bo= th + inputs (i.e. diff-channels =3D <17 17>). + items: + enum: [0, 1, 2, 3, 4, 5, 6, 7, 8, 17, 18, 19, 20, 21, 22, 23, 24= , 25, + 26, 27, 28, 29] + + adi,reference-select: + description: | + Select the reference source to use when converting on the + specific channel. Valid values are: + 0: REFIN+/REFIN- + 1: REFIN2+/REFIN2=E2=88=92 + 2: REFOUT/AVSS (internal reference) + 3: AVDD/AVSS + If not specified, REFOUT/AVSS is used. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2, 3] + default: 1 + + adi,positive-reference-buffer: + $ref: '#/$defs/reference-buffer' + + adi,negative-reference-buffer: + $ref: '#/$defs/reference-buffer' + + adi,sensor-type: + description: + The AD4170 and similar designs have features to aid interfacing = with + load cell weigh scale, RTD, and thermocouple sensors. Each of th= ose + sensor types requires either distinct wiring configuration or + external circuitry for proper sensor operation and can use diffe= rent + ADC chip functionality on their setups. A key characteristic of = those + external sensors is that they must be excited either by voltage = supply + or by ADC chip excitation signals. The sensor can then be read t= hrough + a pair of analog inputs. This property specifies which particular + sensor type is connected to the ADC so it can be properly setup = and + handled. Omit this property for conventional (not weigh scale, R= TD, or + thermocouple) ADC channel setups. + $ref: /schemas/types.yaml#/definitions/string + enum: [ weighscale, rtd, thermocouple ] + + adi,excitation-pin-0: + $ref: '#/$defs/excitation-pin' + + adi,excitation-pin-1: + $ref: '#/$defs/excitation-pin' + + adi,excitation-pin-2: + $ref: '#/$defs/excitation-pin' + + adi,excitation-pin-3: + $ref: '#/$defs/excitation-pin' + + adi,excitation-current-0-microamp: + description: + Excitation current in microamperes to be applied to pin specifie= d in + adi,excitation-pin-0 while this channel is active. + enum: [0, 10, 50, 100, 250, 500, 1000, 1500] + default: 0 + + adi,excitation-current-1-microamp: + description: + Excitation current in microamperes to be applied to pin specifie= d in + adi,excitation-pin-1 while this channel is active. + enum: [0, 10, 50, 100, 250, 500, 1000, 1500] + default: 0 + + adi,excitation-current-2-microamp: + description: + Excitation current in microamperes to be applied to pin specifie= d in + adi,excitation-pin-2 while this channel is active. + enum: [0, 10, 50, 100, 250, 500, 1000, 1500] + default: 0 + + adi,excitation-current-3-microamp: + description: + Excitation current in microamperes to be applied to pin specifie= d in + adi,excitation-pin-3 while this channel is active. + enum: [0, 10, 50, 100, 250, 500, 1000, 1500] + default: 0 + + adi,excitation-ac: + type: boolean + description: + Whether the external sensor has to be AC or DC excited. When omi= tted, + it is DC excited. + + allOf: + - oneOf: + - required: [single-channel, common-mode-channel] + properties: + diff-channels: false + - required: [diff-channels] + properties: + single-channel: false + common-mode-channel: false + # Usual ADC channels don't need external circuitry excitation. + - if: + not: + required: + - adi,sensor-type + then: + properties: + adi,excitation-pin-0: false + adi,excitation-pin-1: false + adi,excitation-pin-2: false + adi,excitation-pin-3: false + adi,excitation-current-0-microamp: false + adi,excitation-current-1-microamp: false + adi,excitation-current-2-microamp: false + adi,excitation-current-3-microamp: false + adi,excitation-ac: false + # Weigh scale bridge AC excited with one pair of predefined signals. + - if: + allOf: + - properties: + adi,sensor-type: + contains: + const: weighscale + - required: + - adi,excitation-ac + - adi,excitation-pin-2 + - adi,excitation-pin-3 + - not: + required: + - adi,excitation-current-2-microamp + - adi,excitation-current-3-microamp + then: + properties: + adi,excitation-pin-2: + const: 19 + adi,excitation-pin-3: + const: 20 + # Weigh scale bridge AC excited with two pairs of predefined signals. + - if: + allOf: + - properties: + adi,sensor-type: + contains: + const: weighscale + - required: + - adi,excitation-ac + - adi,excitation-pin-0 + - adi,excitation-pin-1 + - adi,excitation-pin-2 + - adi,excitation-pin-3 + - not: + required: + - adi,excitation-current-0-microamp + - adi,excitation-current-1-microamp + - adi,excitation-current-2-microamp + - adi,excitation-current-3-microamp + then: + properties: + adi,excitation-pin-0: + const: 17 + adi,excitation-pin-1: + const: 18 + adi,excitation-pin-2: + const: 19 + adi,excitation-pin-3: + const: 20 + +required: + - compatible + - reg + - avdd-supply + - iovdd-supply + - spi-cpol + - spi-cpha + +unevaluatedProperties: false + +examples: + - | + #include + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + + adc@0 { + compatible =3D "adi,ad4170"; + reg =3D <0>; + spi-max-frequency =3D <20000000>; + spi-cpol; + spi-cpha; + avdd-supply =3D <&avdd>; + iovdd-supply =3D <&iovdd>; + clocks =3D <&clk>; + clock-names =3D "xtal"; + interrupt-parent =3D <&gpio_in>; + interrupts =3D <0 IRQ_TYPE_EDGE_FALLING>; + adi,vbias-pins =3D <7>; + #address-cells =3D <1>; + #size-cells =3D <0>; + + // Sample AIN0 with respect to DGND throughout AVDD/DGND input= range + // Pseudo-differential unipolar + channel@0 { + reg =3D <0>; + single-channel =3D <0>; + common-mode-channel =3D <24>; + adi,reference-select =3D <3>; + }; + // Weigh scale sensor + channel@1 { + reg =3D <1>; + bipolar; + diff-channels =3D <1 2>; + adi,reference-select =3D <0>; + adi,positive-reference-buffer =3D <0>; + adi,negative-reference-buffer =3D <0>; + adi,sensor-type =3D "weighscale"; + adi,excitation-pin-2 =3D <19>; + adi,excitation-pin-3 =3D <20>; + adi,excitation-ac; + }; + // RTD sensor + channel@2 { + reg =3D <2>; + bipolar; + diff-channels =3D <3 4>; + adi,reference-select =3D <0>; + adi,sensor-type =3D "rtd"; + adi,excitation-pin-0 =3D <5>; + adi,excitation-pin-1 =3D <6>; + adi,excitation-current-0-microamp =3D <500>; + adi,excitation-current-1-microamp =3D <500>; + adi,excitation-ac; + }; + // Thermocouple sensor + channel@3 { + reg =3D <3>; + bipolar; + diff-channels =3D <7 8>; + adi,reference-select =3D <0>; + adi,sensor-type =3D "thermocouple"; + adi,excitation-pin-0 =3D <18>; + adi,excitation-current-0-microamp =3D <500>; + }; + }; + }; + - | + #include + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + + adc@0 { + compatible =3D "adi,ad4170"; + reg =3D <0>; + spi-max-frequency =3D <20000000>; + spi-cpol; + spi-cpha; + avdd-supply =3D <&avdd>; + iovdd-supply =3D <&iovdd>; + #clock-cells =3D <0>; + clock-output-names =3D "ad4170-clk16mhz"; + interrupt-parent =3D <&gpio_in>; + interrupts =3D <0 IRQ_TYPE_EDGE_FALLING>; + #address-cells =3D <1>; + #size-cells =3D <0>; + + // Sample AIN0 with respect to AIN1 throughout AVDD/AVSS input= range + // Differential bipolar. If AVSS < 0V, differential true bipol= ar + channel@0 { + reg =3D <0>; + bipolar; + diff-channels =3D <0 1>; + adi,reference-select =3D <3>; + }; + // Sample AIN2 with respect to DGND throughout AVDD/DGND input= range + // Pseudo-differential unipolar + channel@1 { + reg =3D <1>; + single-channel =3D <2>; + common-mode-channel =3D <24>; + adi,reference-select =3D <3>; + }; + // Sample AIN3 with respect to 2.5V throughout AVDD/AVSS input= range + // Pseudo-differential bipolar + channel@2 { + reg =3D <2>; + bipolar; + single-channel =3D <3>; + common-mode-channel =3D <29>; + adi,reference-select =3D <3>; + }; + // Sample AIN4 with respect to DGND throughout AVDD/AVSS input= range + // Pseudo-differential bipolar + channel@3 { + reg =3D <3>; + bipolar; + single-channel =3D <4>; + common-mode-channel =3D <24>; + adi,reference-select =3D <3>; + }; + // Sample AIN5 with respect to 2.5V throughout AVDD/AVSS input= range + // Pseudo-differential unipolar (AD4170 datasheet page 46 exam= ple) + channel@4 { + reg =3D <4>; + single-channel =3D <5>; + common-mode-channel =3D <29>; + adi,reference-select =3D <3>; + }; + // Sample AIN6 with respect to 2.5V throughout REFIN+/REFIN- i= nput range + // Pseudo-differential bipolar + channel@5 { + reg =3D <5>; + bipolar; + single-channel =3D <6>; + common-mode-channel =3D <29>; + adi,reference-select =3D <0>; + }; + // Weigh scale sensor + channel@6 { + reg =3D <6>; + bipolar; + diff-channels =3D <7 8>; + adi,reference-select =3D <0>; + adi,sensor-type =3D "weighscale"; + adi,excitation-pin-0 =3D <17>; + adi,excitation-pin-1 =3D <18>; + adi,excitation-pin-2 =3D <19>; + adi,excitation-pin-3 =3D <20>; + adi,excitation-ac; + }; + }; + }; +... + diff --git a/MAINTAINERS b/MAINTAINERS index 5102c25b210b..aa1e249a7b5a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1354,6 +1354,13 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 F: Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml F: drivers/iio/adc/ad4130.c =20 +ANALOG DEVICES INC AD4170 DRIVER +M: Marcelo Schmitt +L: linux-iio@vger.kernel.org +S: Supported +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/adc/adi,ad4170.yaml + ANALOG DEVICES INC AD4695 DRIVER M: Michael Hennerich M: Nuno S=C3=A1 --=20 2.47.2