From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcus Folkesson Subject: [PATCH 2/3] dt-bindings: iio: adc: add bindings for mcp3911 Date: Sat, 21 Jul 2018 21:59:22 +0200 Message-ID: <20180721195923.7610-2-marcus.folkesson@gmail.com> References: <20180721195923.7610-1-marcus.folkesson@gmail.com> Return-path: In-Reply-To: <20180721195923.7610-1-marcus.folkesson@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Marcus Folkesson , Kent Gustavsson , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Mark Rutland Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org MCP3911 is a dual channel Analog Front End (AFE) containing two synchronous sampling delta-sigma Analog-to-Digital Converters (ADC). Signed-off-by: Marcus Folkesson Signed-off-by: Kent Gustavsson --- .../devicetree/bindings/iio/adc/mcp3911.txt | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/mcp3911.txt diff --git a/Documentation/devicetree/bindings/iio/adc/mcp3911.txt b/Documentation/devicetree/bindings/iio/adc/mcp3911.txt new file mode 100644 index 000000000000..e233ee94ad96 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/mcp3911.txt @@ -0,0 +1,33 @@ +* Microchip MCP3911 Dual channel analog front end (ADC) + +Required properties: + - compatible: Should be "microchip,mcp3911" + - reg: SPI chip select number for the device + +Recommended properties: + - spi-max-frequency: Definition as per + Documentation/devicetree/bindings/spi/spi-bus.txt. + Max frequency for this chip is 20MHz. + +Optional properties: + - device-addr: Device address when multiple MCP3911 chips are present on the + same SPI bus. Valid values are 0-3. Defaults to 0. + - external-clock: Use external clock instead of crystal oscillator. + - external-vref: Use external voltage reference + - vref-supply: Phandle to the external reference voltage supply. (only valid in combination with `external-vref`) + - ch0-width: width for channel0. Valid widths are 16 and 24bits. + - ch1-width: width for channel1. Valid widths are 16 and 24bits. + + +Example: +adc@0 { + compatible = "microchip,mcp3911"; + reg = <0>; + spi-max-frequency = <20000000>; + device-addr = <0>; + ch0-width = <16>; + ch1-width = <24>; + external-clock; + external-vref; + vref-supply = <&vref_reg>; +}; -- 2.11.0.rc2