dts: mimxrt685s/cm33: Instantiate nxp,rtxxx-dsp-ctrl

Instantiate the nxp,rtxxx-dsp-ctrl driver to enable DSP code upload and
run control.

Signed-off-by: Vit Stanicek <[email protected]>

Author: VitekST

dts/arm/nxp/nxp_rt6xx_common.dtsi

@@ -12,6 +12,7 @@
 #include <zephyr/dt-bindings/i2c/i2c.h>
 #include <zephyr/dt-bindings/memory-attr/memory-attr-arm.h>
 #include <zephyr/dt-bindings/reset/nxp_syscon_reset_common.h>
+#include <zephyr/dt-bindings/misc/nxp_rtxxx_dsp_ctrl.h>
 
 / {
 	chosen {
@@ -48,6 +49,31 @@
 			};
 		};
 	};
+
+	dsp: dsp {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		compatible = "nxp,rtxxx-dsp-ctrl";
+		sysctl = <&sysctl0>;
+
+		status = "disabled";
+
+		region@24020000 {
+			reg = <0x24020000 DT_SIZE_K(1)>;
+			type = <NXP_RTXXX_DSP_REGION_RESET>;
+		};
+
+		region@20400000 {
+			reg = <0x20400000 DT_SIZE_K(256)>;
+			type = <NXP_RTXXX_DSP_REGION_TEXT>;
+		};
+
+		region@20440000 {
+			reg = <0x20440000 DT_SIZE_K(256)>;
+			type = <NXP_RTXXX_DSP_REGION_DATA>;
+		};
+	};
 };
 
 &sram {
@@ -110,6 +136,15 @@
 		#clock-cells = <1>;
 	};
 
+	/*
+	 * Dummy node - it does not instantiate a real driver, rather it provide the
+	 * base address of the SYSCTL0 block for use with the "dsp" node.
+	 */
+	sysctl0: sysctl@2000 {
+		reg = <0x2000 0x2000>;
+		compatible = "nxp,rt6xx-sysctl";
+	};
+
 	iocon: iocon@4000 {
 		compatible = "nxp,lpc-iocon";
 		reg = <0x4000 0x1000>;

dts/arm/nxp/nxp_rt6xx_hifi4memsplit.dtsi

@@ -0,0 +1,9 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&sram0 {
+	reg = <0x180000 DT_SIZE_K(2560)>;
+};