dts: mimxrt1050_evk: Add external memory nodes

Adds flexspi and semc memory controllers to the i.MX RT SoC. Adds
hyperflash, qspi, and sdram external memories to the mimxrt1050_evk
board.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>

boards/arm/mimxrt1050_evk/mimxrt1050_evk.dts

@@ -26,6 +26,26 @@
 		zephyr,sram = &dtcm0;
 		zephyr,console = &uart1;
 	};
+
+	sdram0: memory@80000000 {
+		/* Micron MT48LC16M16A2B4-6AIT:G */
+		device_type = "memory";
+		reg = <0x80000000 0x2000000>;
+	};
+};
+
+&flexspi0 {
+	hyperflash0: hyperflash@0 {
+		/* Cypress S26KS512SDPBHI02 */
+		reg = <0x60000000 0x4000000>;
+		status = "disabled";
+	};
+
+	qspi0: qspi@0 {
+		/* ISSI IS25WP064AJBLE */
+		reg = <0x60000000 0x800000>;
+		status = "disabled";
+	};
 };
 
 &uart1 {

dts/arm/nxp/nxp_rt.dtsi

@@ -41,6 +41,24 @@
 			};
 		};
 
+		flexspi0: flexspi0@402a8000 {
+			compatible = "nxp,imx-flexspi";
+			reg = <0x402a8000 0x4000>;
+			interrupts = <108 0>;
+			label = "FLEXSPI0";
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
+		semc0: semc0@402f0000 {
+			compatible = "nxp,imx-semc";
+			reg = <0x402f0000 0x4000>;
+			interrupts = <109 0>;
+			label = "SEMC0";
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		ccm: ccm@400fc000 {
 			compatible = "nxp,imx-ccm";
 			reg = <0x400fc000 0x4000>;

dts/bindings/memory-controllers/nxp,imx-semc.yaml

@@ -0,0 +1,39 @@
+#
+# Copyright (c) 2018, NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: NXP SEMC
+id: nxp,imx-semc
+version: 0.1
+
+description: >
+    This binding gives a base representation of the NXP smart external memory
+    controller (SEMC)
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "nxp,imx-semc"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+
+    label:
+      type: string
+      category: required
+      description: Human readable string describing the device (used by Zephyr for API name)
+      generation: define
+...

dts/bindings/spi/nxp,imx-flexspi.yaml

@@ -0,0 +1,35 @@
+#
+# Copyright (c) 2018, NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: NXP FlexSPI
+id: nxp,imx-flexspi
+version: 0.1
+
+description: >
+    This binding gives a base representation of the NXP FlexSPI controller
+
+inherits:
+    !include spi.yaml
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "nxp,imx-flexspi"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+...