AD5764, DAC Error in T4241

immbalu — Thu, 13 Jan 2022 12:21:57 GMT

Hello,

We are using AD5764 DAC, which is on spi interface

added the following dac device tree

vdac: fixedregulator0 {
compatible = "regulator-fixed";
regulator-name = "vdac";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-boot-on;
};

dac@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "adi,ad5764";
reg = <0x0>;
spi-max-frequency = <25000000>;
vrefAB-supply = <&vdac>;
vrefCD-supply = <&vdac>;
status = "okay";
};

I'm able to see DAC device files, But when i try to read dac output i'm getting the following error,

root@Q4241:/sys/devices/platform/ffe000000.soc/ffe110000.spi/spi_master/spi0/spi0.0/iio:device0# cat out_voltage0_scale
cat: read error: Invalid argument

Thanks,

Balaji.G

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AD5764, DAC Error in T4241