[nrf fromlist] dts: nordic: nrf54h20: Change compatible property of EXMIF node

This is a follow-up to commit cdf45cb234077522b5cef2da084869af43d42dc1.

Adjust the DTS node for the EXMIF peripheral so that it is possible to
handle the peripheral with the generic MSPI driver for DW SSI based
controllers and use all its data lines in communication.
Also adjust the related board files accordingly.

Signed-off-by: Andrzej Głąbek <[email protected]>
(cherry picked from commit ad6bd27e4b1dddd5bdb045ae7204393a2e68d51c)

Upstream PR: zephyrproject-rtos/zephyr#80042

Author: anangl

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20-pinctrl.dtsi

@@ -73,8 +73,19 @@
 	/omit-if-no-ref/ exmif_default: exmif_default {
 		group1 {
 			psels = <NRF_PSEL(EXMIF_CK, 6, 0)>,
+				/* These two cannot be used until nrf-regtool
+				 * is updated.
+				 * <NRF_PSEL(EXMIF_CS0, 6, 3)>,
+				 * <NRF_PSEL(EXMIF_RWDS, 6, 2)>,
+				 */
 				<NRF_PSEL(EXMIF_DQ0, 6, 7)>,
-				<NRF_PSEL(EXMIF_DQ1, 6, 5)>;
+				<NRF_PSEL(EXMIF_DQ1, 6, 5)>,
+				<NRF_PSEL(EXMIF_DQ2, 6, 10)>,
+				<NRF_PSEL(EXMIF_DQ3, 6, 9)>,
+				<NRF_PSEL(EXMIF_DQ4, 6, 11)>,
+				<NRF_PSEL(EXMIF_DQ5, 6, 8)>,
+				<NRF_PSEL(EXMIF_DQ6, 6, 6)>,
+				<NRF_PSEL(EXMIF_DQ7, 6, 4)>;
 			nordic,drive-mode = <NRF_DRIVE_H0H1>;
 		};
 	};

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20_cpuapp.dts

@@ -271,15 +271,18 @@ ipc0: &cpuapp_cpurad_ipc {
 };
 
 &exmif {
-	cs-gpios = <&gpio6 3 GPIO_ACTIVE_LOW>;
 	pinctrl-0 = <&exmif_default>;
 	pinctrl-names = "default";
 	status = "okay";
+	/* Hardware control of CS0 cannot be used until nrf-regtool is updated.
+	 * Use GPIO instead for now.
+	 */
+	ce-gpios = <&gpio6 3 GPIO_ACTIVE_LOW>;
+
 	mx25uw63: mx25uw6345g@0 {
-		compatible = "jedec,spi-nor";
-		status = "disabled";
+		compatible = "jedec,mspi-nor";
+		status = "okay";
 		reg = <0>;
-		spi-max-frequency = <DT_FREQ_M(48)>;
 		jedec-id = [c2 84 37];
 		sfdp-bfp = [
 			e5 20 8a ff  ff ff ff 03  00 ff 00 ff  00 ff 00 ff
@@ -292,6 +295,15 @@ ipc0: &cpuapp_cpurad_ipc {
 		has-dpd;
 		t-enter-dpd = <10000>;
 		t-exit-dpd = <30000>;
+		reset-gpios = <&gpio6 12 GPIO_ACTIVE_LOW>;
+
+		mspi-max-frequency = <DT_FREQ_M(50)>;
+		mspi-io-mode = "MSPI_IO_MODE_OCTAL";
+		mspi-data-rate = "MSPI_DATA_RATE_SINGLE";
+		mspi-hardware-ce-num = <1>;
+		mspi-cpp-mode = "MSPI_CPP_MODE_0";
+		mspi-endian = "MSPI_BIG_ENDIAN";
+		mspi-ce-polarity = "MSPI_CE_ACTIVE_LOW";
 	};
 };
 

dts/bindings/spi/nordic,nrf-exmif.yaml

@@ -5,8 +5,4 @@ description: Nordic External Memory Interface (EXMIF)
 
 compatible: "nordic,nrf-exmif"
 
-include: snps,designware-spi.yaml
-
-properties:
-  reg:
-    required: true
+include: snps,designware-ssi.yaml

dts/common/nordic/nrf54h20.dtsi

@@ -506,15 +506,16 @@
 			};
 
 			exmif: spi@95000 {
-				compatible = "nordic,nrf-exmif";
+				compatible = "nordic,nrf-exmif", "snps,designware-ssi";
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0x95000 0x500 0x95500 0xb00>;
 				reg-names = "wrapper", "core";
 				interrupts = <149 NRF_DEFAULT_IRQ_PRIORITY>;
 				clock-frequency = <DT_FREQ_M(400)>;
 				fifo-depth = <32>;
-				max-xfer-size = <16>;
+				tx-fifo-threshold = <8>;
+				rx-fifo-threshold = <24>;
 				status = "disabled";
 			};