add device tree fragment to add SPI CS lines on BCM pins 5 and 20

daq-dtoverlay/extended-cs-lines.dts

@@ -0,0 +1,41 @@
+/dts-v1/;
+/plugin/;
+
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&spi0_cs_pins>;
+		frag0: __overlay__ {
+			brcm,pins = <8 7 5 20>;
+		};
+	};
+
+	fragment@1 {
+		target = <&spi0>;
+		frag1: __overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			cs-gpios = <&gpio 8 1>, <&gpio 7 1>, <&gpio 5 1>, <&gpio 20 1>;
+			status = "okay";
+
+			spidev0_2: spidev@2 {
+				compatible = "spidev";
+				reg = <2>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				spi-max-frequency = <125000000>;
+			};
+
+			spidev0_3: spidev@3 {
+				compatible = "spidev";
+				reg = <3>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				spi-max-frequency = <125000000>;
+			};
+		};
+	};
+};