* Microchip Analog to Digital Converter (ADC) The node for this driver must be a child node of a SPI controller, hence all mandatory properties described in Documentation/devicetree/bindings/spi/spi-bus.txt must be specified. Required properties: - compatible: Must be one of the following, depending on the model: "mcp3001" (DEPRECATED) "mcp3002" (DEPRECATED) "mcp3004" (DEPRECATED) "mcp3008" (DEPRECATED) "mcp3201" (DEPRECATED) "mcp3202" (DEPRECATED) "mcp3204" (DEPRECATED) "mcp3208" (DEPRECATED) "mcp3301" (DEPRECATED) "microchip,mcp3001" "microchip,mcp3002" "microchip,mcp3004" "microchip,mcp3008" "microchip,mcp3201" "microchip,mcp3202" "microchip,mcp3204" "microchip,mcp3208" "microchip,mcp3301" "microchip,mcp3550-50" "microchip,mcp3550-60" "microchip,mcp3551" "microchip,mcp3553" NOTE: The use of the compatibles with no vendor prefix is deprecated and only listed because old DT use them. - spi-cpha, spi-cpol (boolean): Either SPI mode (0,0) or (1,1) must be used, so specify none or both of spi-cpha, spi-cpol. The MCP3550/1/3 is more efficient in mode (1,1) as only 3 instead of 4 bytes need to be read from the ADC, but not all SPI masters support it. - vref-supply: Phandle to the external reference voltage supply. Examples: spi_controller { mcp3x0x@0 { compatible = "microchip,mcp3002"; reg = <0>; spi-max-frequency = <1000000>; vref-supply = <&vref_reg>; }; };