dts: nordic: add QSPI XIP area registers for nordic devices

There is currently no information available about the XIP
addresses for the nRF52840 and nRF5340.

Add this via a new 'reg' block in the relevant QSPI nodes, along with
names for the register blocks so they are easier to retrieve.

Signed-off-by: Håkon Øye Amundsen <[email protected]>
Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

dts/arm/nordic/nrf52840.dtsi

@@ -413,7 +413,8 @@
 			compatible = "nordic,nrf-qspi";
 			#address-cells = <1>;
 			#size-cells = <0>;
-			reg = <0x40029000 0x1000>;
+			reg = <0x40029000 0x1000>, <0x12000000 0x8000000>;
+			reg-names = "qspi", "qspi_mm";
 			interrupts = <41 NRF_DEFAULT_IRQ_PRIORITY>;
 			status = "disabled";
 			label = "QSPI";

dts/arm/nordic/nrf5340_cpuapp_peripherals.dtsi

@@ -382,7 +382,8 @@ qspi: qspi@2b000 {
 	compatible = "nordic,nrf-qspi";
 	#address-cells = <1>;
 	#size-cells = <0>;
-	reg = <0x2b000 0x1000>;
+	reg = <0x2b000 0x1000>, <0x10000000 0x10000000>;
+	reg-names = "qspi", "qspi_mm";
 	interrupts = <43 NRF_DEFAULT_IRQ_PRIORITY>;
 	status = "disabled";
 	label = "QSPI";

dts/bindings/flash_controller/nordic,nrf-qspi.yaml

@@ -4,6 +4,21 @@
 description: |
     Properties defining the interface for the Nordic QSPI peripheral.
 
+    The reg property describes two register blocks: one for the memory
+    corresponding to the QSPI peripheral registers, and another for
+    the memory mapped XIP area:
+
+        qspi: qspi@2b000 {
+                compatible = "nordic,nrf-qspi";
+                reg = <0x2b000 0x1000>, <0x10000000 0x10000000>;
+                reg-names = "qspi", "qspi_mm";
+                ...
+        };
+
+    Above, the register block with base address 0x2b000 and name
+    "qspi" are the QSPI peripheral registers. The register block with
+    base address 0x10000000 and name "qspi_mm" is the XIP area.
+
 compatible: "nordic,nrf-qspi"
 
 include: flash-controller.yaml