arm64: dts: marvell: add NAND support on the 7040-DB board

The NAND controller used in A7K/A8K is present on the CP110 master part.
It is compatible with the pxa3xx_nand driver but requires the use of the
marvell,armada-8k-nand compatible string due to the need to first enable
the NAND controller.

Add properties to the NAND node to fit the bindings constraints of the
pxa3xx_nand driver and enable the NAND controller.

Add the 'marvell,system-controller' property to the cp110 master NAND
node with a reference to the syscon node. This is new compared to other
boards using the pxa3xx_nand driver and it is needed to be bootloader
independent and enable the NAND controller from the NAND controller
driver itself by writing in these syscon registers.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
[miquel.raynal@free-electrons.com: add NAND ready/busy MPP subnode,
change compatible string to fit the needs of the A7k/A8k SoCs and add
the system controller property]
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-7040-db.dts

@@ -146,6 +146,36 @@
 	};
 };
 
+&cpm_nand {
+	/*
+	 * SPI on CPM and NAND have common pins on this board. We can
+	 * use only one at a time. To enable the NAND (whihch will
+	 * disable the SPI), the "status = "okay";" line have to be
+	 * added here.
+	 */
+	num-cs = <1>;
+	pinctrl-0 = <&nand_pins>, <&nand_rb>;
+	pinctrl-names = "default";
+	nand-ecc-strength = <4>;
+	nand-ecc-step-size = <512>;
+	marvell,nand-enable-arbiter;
+	nand-on-flash-bbt;
+
+	partition@0 {
+		label = "U-Boot";
+		reg = <0 0x200000>;
+	};
+	partition@200000 {
+		label = "Linux";
+		reg = <0x200000 0xe00000>;
+	};
+	partition@1000000 {
+		label = "Filesystem";
+		reg = <0x1000000 0x3f000000>;
+	};
+};
+
+
 &cpm_spi1 {
 	status = "okay";
 

arch/arm64/boot/dts/marvell/armada-70x0.dtsi

@@ -64,5 +64,19 @@
 &cpm_syscon0 {
 	cpm_pinctrl: pinctrl {
 		compatible = "marvell,armada-7k-pinctrl";
+
+		nand_pins: nand-pins {
+			marvell,pins =
+			"mpp15", "mpp16", "mpp17", "mpp18",
+			"mpp19", "mpp20", "mpp21", "mpp22",
+			"mpp23", "mpp24", "mpp25", "mpp26",
+			"mpp27";
+			marvell,function = "dev";
+		};
+
+		nand_rb: nand-rb {
+			marvell,pins = "mpp13";
+			marvell,function = "nf";
+		};
 	};
 };

arch/arm64/boot/dts/marvell/armada-cp110-master.dtsi

@@ -315,12 +315,14 @@
 				 * this controller is only usable on the CPM
 				 * for A7K and on the CPS for A8K.
 				 */
-				compatible = "marvell,armada370-nand";
+				compatible = "marvell,armada-8k-nand",
+					     "marvell,armada370-nand";
 				reg = <0x720000 0x54>;
 				#address-cells = <1>;
 				#size-cells = <1>;
 				interrupts = <ICU_GRP_NSR 115 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&cpm_clk 1 2>;
+				marvell,system-controller = <&cpm_syscon0>;
 				status = "disabled";
 			};
 

arch/arm64/boot/dts/marvell/armada-cp110-slave.dtsi

@@ -316,7 +316,8 @@
 				 * this controller is only usable on the CPM
 				 * for A7K and on the CPS for A8K.
 				 */
-				compatible = "marvell,armada370-nand";
+				compatible = "marvell,armada370-nand",
+					     "marvell,armada370-nand";
 				reg = <0x720000 0x54>;
 				#address-cells = <1>;
 				#size-cells = <1>;