1Analog Devices AD2S90 Resolver-to-Digital Converter 2 3https://www.analog.com/en/products/ad2s90.html 4 5Required properties: 6 - compatible: should be "adi,ad2s90" 7 - reg: SPI chip select number for the device 8 - spi-max-frequency: set maximum clock frequency, must be 830000 9 - spi-cpol and spi-cpha: 10 Either SPI mode (0,0) or (1,1) must be used, so specify none or both of 11 spi-cpha, spi-cpol. 12 13See for more details: 14 Documentation/devicetree/bindings/spi/spi-bus.txt 15 16Note about max frequency: 17 Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns 18 delay is expected between the application of a logic LO to CS and the 19 application of SCLK, as also specified. And since the delay is not 20 implemented in the spi code, to satisfy it, SCLK's period should be at most 21 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives 22 roughly 830000Hz. 23 24Example: 25resolver@0 { 26 compatible = "adi,ad2s90"; 27 reg = <0>; 28 spi-max-frequency = <830000>; 29 spi-cpol; 30 spi-cpha; 31}; 32