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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id b7-20020a9d4787000000b006e4ab46ede1sm325141otf.2.2024.02.29.08.26.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 08:26:21 -0800 (PST) From: David Lechner To: linux-iio@vger.kernel.org Cc: David Lechner , Michael Hennerich , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Nuno_S=C3=A1?= , Liam Girdwood , Mark Brown , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] dt-bindings: iio: adc: add ad7944 ADCs Date: Thu, 29 Feb 2024 10:25:50 -0600 Message-ID: <20240229-ad7944-mainline-v4-1-f88b5ec4baed@baylibre.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240229-ad7944-mainline-v4-0-f88b5ec4baed@baylibre.com> References: <20240229-ad7944-mainline-v4-0-f88b5ec4baed@baylibre.com> 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" X-Mailer: b4 0.12.4 Content-Transfer-Encoding: quoted-printable This adds a new binding for the Analog Devices, Inc. AD7944, AD7985, and AD7986 ADCs. Signed-off-by: David Lechner Reviewed-by: Rob Herring --- v4 changes: - Fixed broken patch due to misplaced changelog v3 changes: - Removed default 'multi' value from adi,spi-mode property. This simplifies things a bit by not having to check for two possible conditions (absence = of property or explicit default value). Now, only absence of property is val= id to indicate the default mode. Constraints that depend on this property are updated accordingly. - Fixed spelling of 'conventional'. - Expanded description to call out potential confusion of '3-wire' mode bei= ng unrelated to the standard spi-3wire property. - Added standard '#daisy-chained-devices' property for chain mode. - Relaxed requirement of cnv-gpios since it was determined that an active h= igh CS could actually be used in chain mode. --- .../devicetree/bindings/iio/adc/adi,ad7944.yaml | 213 +++++++++++++++++= ++++ MAINTAINERS | 8 + 2 files changed, 221 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml b/Do= cumentation/devicetree/bindings/iio/adc/adi,ad7944.yaml new file mode 100644 index 000000000000..2564ef4f58cc --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml @@ -0,0 +1,213 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad7944.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices PulSAR LFCSP Analog to Digital Converters + +maintainers: + - Michael Hennerich + - Nuno S=C3=A1 + +description: | + A family of pin-compatible single channel differential analog to digital + converters with SPI support in a LFCSP package. + + * https://www.analog.com/en/products/ad7944.html + * https://www.analog.com/en/products/ad7985.html + * https://www.analog.com/en/products/ad7986.html + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7944 + - adi,ad7985 + - adi,ad7986 + + reg: + maxItems: 1 + + spi-max-frequency: + maximum: 111111111 + + spi-cpol: true + spi-cpha: true + + adi,spi-mode: + $ref: /schemas/types.yaml#/definitions/string + enum: [ single, chain ] + description: | + This property indicates the SPI wiring configuration. + + When this property is omitted, it is assumed that the device is usin= g what + the he datasheet calls "4-wire mode". This is the conventional SPI m= ode + used when there are multiple devices on the same bus. In this mode, = the + CNV line is used to initiate the conversion and the SDI line is conn= ected + to CS on the SPI controller. + + When this property is present, it indicates that the device is using= one + of the following alternative wiring configurations: + + * single: The datasheet calls this "3-wire mode". (NOTE: The datashe= et's + definition of 3-wire mode is NOT at all related to the standard + spi-3wire property!) This mode is often used when the ADC is the o= nly + device on the bus. In this mode, SDI is tied to VIO, and the CNV l= ine + can be connected to the CS line of the SPI controller or to a GPIO= , in + which case the CS line of the controller is unused. + * chain: The datasheet calls this "chain mode". This mode is used to= save + on wiring when multiple ADCs are used. In this mode, the SDI line = of + one chip is tied to the SDO of the next chip in the chain and the = SDI of + the last chip in the chain is tied to GND. Only the first chip in = the + chain is connected to the SPI bus. The CNV line of all chips are t= ied + together. The CS line of the SPI controller can be used as the CNV= line + only if it is active high. + + '#daisy-chained-devices': true + + avdd-supply: + description: A 2.5V supply that powers the analog circuitry. + + dvdd-supply: + description: A 2.5V supply that powers the digital circuitry. + + vio-supply: + description: + A 1.8V to 2.7V supply for the digital inputs and outputs. + + bvdd-supply: + description: + A voltage supply for the buffered power. When using an external refe= rence + without an internal buffer (PDREF high, REFIN low), this should be + connected to the same supply as ref-supply. Otherwise, when using an + internal reference or an external reference with an internal buffer,= this + is connected to a 5V supply. + + ref-supply: + description: + Voltage regulator for the external reference voltage (REF). This pro= perty + is omitted when using an internal reference. + + refin-supply: + description: + Voltage regulator for the reference buffer input (REFIN). When using= an + external buffer with internal reference, this should be connected to= a + 1.2V external reference voltage supply. Otherwise, this property is + omitted. + + cnv-gpios: + description: + The Convert Input (CNV). This input has multiple functions. It initi= ates + the conversions and selects the SPI mode of the device (chain or CS)= . In + 'single' mode, this property is omitted if the CNV pin is connected = to the + CS line of the SPI controller. + maxItems: 1 + + turbo-gpios: + description: + GPIO connected to the TURBO line. If omitted, it is assumed that the= TURBO + line is hard-wired and the state is determined by the adi,always-tur= bo + property. + maxItems: 1 + + adi,always-turbo: + type: boolean + description: + When present, this property indicates that the TURBO line is hard-wi= red + and the state is always high. If neither this property nor turbo-gpi= os is + present, the TURBO line is assumed to be hard-wired and the state is + always low. + + interrupts: + description: + The SDO pin can also function as a busy indicator. This node should = be + connected to an interrupt that is triggered when the SDO line goes l= ow + while the SDI line is high and the CNV line is low ('single' mode) o= r the + SDI line is low and the CNV line is high ('multi' mode); or when the= SDO + line goes high while the SDI and CNV lines are high (chain mode), + maxItems: 1 + +required: + - compatible + - reg + - avdd-supply + - dvdd-supply + - vio-supply + - bvdd-supply + +allOf: + # ref-supply and refin-supply are mutually exclusive (neither is also va= lid) + - if: + required: + - ref-supply + then: + properties: + refin-supply: false + - if: + required: + - refin-supply + then: + properties: + ref-supply: false + # in '4-wire' mode, cnv-gpios is required, for other modes it is optional + - if: + not: + required: + - adi,spi-mode + then: + required: + - cnv-gpios + # chain mode has lower SCLK max rate and doesn't work when TURBO is enab= led + - if: + required: + - adi,spi-mode + properties: + adi,spi-mode: + const: chain + then: + properties: + spi-max-frequency: + maximum: 90909090 + adi,always-turbo: false + required: + - '#daisy-chained-devices' + else: + properties: + '#daisy-chained-devices': false + # turbo-gpios and adi,always-turbo are mutually exclusive + - if: + required: + - turbo-gpios + then: + properties: + adi,always-turbo: false + - if: + required: + - adi,always-turbo + then: + properties: + turbo-gpios: false + +unevaluatedProperties: false + +examples: + - | + #include + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + adc@0 { + compatible =3D "adi,ad7944"; + reg =3D <0>; + spi-cpha; + spi-max-frequency =3D <111111111>; + avdd-supply =3D <&supply_2_5V>; + dvdd-supply =3D <&supply_2_5V>; + vio-supply =3D <&supply_1_8V>; + bvdd-supply =3D <&supply_5V>; + cnv-gpios =3D <&gpio 0 GPIO_ACTIVE_HIGH>; + turbo-gpios =3D <&gpio 1 GPIO_ACTIVE_HIGH>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 2662ec49b297..35f27504632d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -441,6 +441,14 @@ W: http://wiki.analog.com/AD7879 W: https://ez.analog.com/linux-software-drivers F: drivers/input/touchscreen/ad7879.c =20 +AD7944 ADC DRIVER (AD7944/AD7985/AD7986) +M: Michael Hennerich +M: Nuno S=C3=A1 +R: David Lechner +S: Supported +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml + ADAFRUIT MINI I2C GAMEPAD M: Anshul Dalal L: linux-input@vger.kernel.org --=20 2.43.2