arm: socfpga: dts: Add Cadence QSPI DT node to socfpga.dtsi

This DT node is taken from the Rocketboard.org Linux repsitory. And
is needed to enable (configure) the Cadence DM SPI driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Vince Bridgers <vbridger@altera.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Pavel Machek <pavel@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

arch/arm/dts/socfpga.dtsi

@@ -628,6 +628,21 @@
 			clock-names = "biu", "ciu";
 		};
 
+		qspi: spi@ff705000 {
+			compatible = "cadence,qspi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0xff705000 0x1000>,
+				<0xffa00000 0x1000>;
+			interrupts = <0 151 4>;
+			clocks = <&qspi_clk>;
+			ext-decoder = <0>;  /* external decoder */
+			num-chipselect = <4>;
+			fifo-depth = <128>;
+			bus-num = <2>;
+			status = "disabled";
+		};
+
 		/* Local timer */
 		timer@fffec600 {
 			compatible = "arm,cortex-a9-twd-timer";

arch/arm/dts/socfpga_cyclone5_socrates.dts

@@ -37,3 +37,23 @@
 &mmc {
 	status = "okay";
 };
+
+&qspi {
+	status = "okay";
+
+	flash0: n25q00@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "n25q00";
+		reg = <0>;      /* chip select */
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+		page-size = <256>;
+		block-size = <16>; /* 2^16, 64KB */
+		read-delay = <4>;  /* delay value in read data capture register */
+		tshsl-ns = <50>;
+		tsd2d-ns = <50>;
+		tchsh-ns = <4>;
+		tslch-ns = <4>;
+	};
+};