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[198.48.202.89]) by smtp.gmail.com with ESMTPSA id p188sm2380514qka.114.2021.07.27.16.29.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 16:29:24 -0700 (PDT) From: Liam Beguin To: liambeguin@gmail.com, lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, charles-antoine.couret@essensium.com, Nuno.Sa@analog.com Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org Subject: [PATCH v4 4/5] dt-bindings: iio: adc: ad7949: add per channel reference Date: Tue, 27 Jul 2021 19:29:05 -0400 Message-Id: <20210727232906.980769-5-liambeguin@gmail.com> X-Mailer: git-send-email 2.30.1.489.g328c10930387 In-Reply-To: <20210727232906.980769-1-liambeguin@gmail.com> References: <20210727232906.980769-1-liambeguin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Liam Beguin Add bindings documentation describing per channel reference voltage selection. This adds the adi,internal-ref-microvolt property, and child nodes for each channel. This is required to properly configure the ADC sample request based on which reference source should be used for the calculation. Signed-off-by: Liam Beguin Reviewed-by: Rob Herring --- .../bindings/iio/adc/adi,ad7949.yaml | 69 +++++++++++++++++-- 1 file changed, 65 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml index 9b56bd4d5510..893f72b8081e 100644 --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml @@ -26,19 +26,63 @@ properties: reg: maxItems: 1 + vrefin-supply: + description: + Buffered ADC reference voltage supply. + vref-supply: description: - ADC reference voltage supply + Unbuffered ADC reference voltage supply. spi-max-frequency: true - "#io-channel-cells": + '#io-channel-cells': const: 1 + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + required: - compatible - reg - - vref-supply + +patternProperties: + '^channel@([0-7])$': + type: object + description: | + Represents the external channels which are connected to the ADC. + + properties: + reg: + description: | + The channel number. + Up to 4 channels, numbered from 0 to 3 for adi,ad7682. + Up to 8 channels, numbered from 0 to 7 for adi,ad7689 and adi,ad7949. + items: + minimum: 0 + maximum: 7 + + adi,internal-ref-microvolt: + description: | + Internal reference voltage selection in microvolts. + + If no internal reference is specified, the channel will default to the + external reference defined by vrefin-supply (or vref-supply). + vrefin-supply will take precedence over vref-supply if both are defined. + + If no supplies are defined, the reference selection will default to + 4096mV internal reference. + + enum: [2500000, 4096000] + default: 4096000 + + required: + - reg + + additionalProperties: false additionalProperties: false @@ -49,9 +93,26 @@ examples: #size-cells = <0>; adc@0 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "adi,ad7949"; reg = <0>; - vref-supply = <&vdd_supply>; + vrefin-supply = <&vdd_supply>; + + channel@0 { + adi,internal-ref-microvolt = <4096000>; + reg = <0>; + }; + + channel@1 { + adi,internal-ref-microvolt = <2500000>; + reg = <1>; + }; + + channel@2 { + reg = <2>; + }; }; }; ...