arm64: mvebu: Armada 3700: Add SPI device tree nodes

This patch adds the SPI device tree nodes that are still missing to
the Armada 3700 dts files.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Wilson Ding <dingwei@marvell.com>
Cc: Victor Gu <xigu@marvell.com>
Cc: Hua Jing <jinghua@marvell.com>
Cc: Terry Zhou <bjzhou@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/arch/arm/dts/armada-3720-db.dts b/arch/arm/dts/armada-3720-db.dts
index 86110a6..7bfa840 100644
--- a/arch/arm/dts/armada-3720-db.dts
+++ b/arch/arm/dts/armada-3720-db.dts
@@ -56,6 +56,10 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	aliases {
+		spi0 = &spi0;
+	};
+
 	memory {
 		device_type = "memory";
 		reg = <0x00000000 0x00000000 0x00000000 0x20000000>;
@@ -67,6 +71,19 @@
 	status = "okay";
 };
 
+&spi0 {
+	status = "okay";
+
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "st,m25p128", "spi-flash";
+		reg = <0>; /* Chip select 0 */
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+	};
+};
+
 /* Exported on the micro USB connector CON32 through an FTDI */
 &uart0 {
 	status = "okay";