drivers: iio: adc: Update ad7779 to use upstream iio_backend

Signed-off-by: Ioana Risteiu <Ioana.Risteiu@analog.com>

Author: iristeiu06

arch/arm/boot/dts/xilinx/zynq-zed-ad7779.dts

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+#include "zynq-zed.dts"
+
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+ 	vref: regulator-vref {
+		 compatible = "regulator-fixed";
+		 regulator-name = "fixed-supply";
+		 regulator-min-microvolt = <3600000>;
+		 regulator-max-microvolt = <3600000>;
+		 regulator-always-on;
+	 };
+
+	clocks {
+		ad7779_mclk: clock@0 {
+			 #clock-cells = <0>;
+			 compatible = "fixed-clock";
+			 clock-frequency = <4096000>;
+		 };
+
+		axi_clk: clock@1 {
+			compatible = "fixed-clock";
+			clock-frequency = <100000000>;
+			clock-output-names = "axi-clk";
+			#clock-cells = <0>;
+		};
+	};
+
+	fpga-axi@0 {
+		compatible = "simple-bus";
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		ranges;
+
+		rx_dma: dmac@7c480000 {
+			compatible = "adi,axi-dmac-1.00.a";
+			reg = <0x7c480000 0x1000>;
+			#dma-cells = <1>;
+			interrupt-parent = <&intc>;
+			interrupts = <0 54 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clkc 16>;
+
+			adi,channels {
+				#size-cells = <0>;
+				#address-cells = <1>;
+
+				dma_channel: dma-channel@0 {
+					reg = <0>;
+					adi,source-bus-width = <256>;
+					adi,source-bus-type = <2>;
+					adi,destination-bus-width = <64>;
+					adi,destination-bus-type = <0>;
+				};
+			};
+		};
+
+		iio_backend: axi_adc@43c00000 {
+			compatible = "adi,axi-adc-10.0.a";
+			reg = <0x43c00000 0x10000>;
+			dmas = <&rx_dma 0>;
+			dma-names = "rx";
+			clocks = <&axi_clk>;
+			spibus-connected = <&ad7779>;
+		};
+	};
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&spi0 {
+ 	#address-cells = <1>;
+ 	#size-cells = <0>;
+ 	status = "okay";
+
+	ad7779: adc@0 {
+		 compatible = "adi,ad7779";
+		 reg = <0>;
+		 spi-max-frequency = <20000000>;
+
+		 vref-supply = <&vref>;
+
+		 start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+		 reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
+		
+		 clocks = <&ad7779_mclk>;
+		 clock-names = "mclk";
+		adi,data-lines = <8>;
+
+		//interrupt-parent = <&intc>;
+		//interrupts = <0 56 IRQ_TYPE_LEVEL_HIGH>;
+
+		io-backends = <&iio_backend>;
+	};
+};