ARM: dts: dra72-evm: Add NAND support

DRA72-evm has a 256MB 16-bit wide NAND chip. Add
pinmux and NAND node.

The NAND chips 'Chip select' and 'Write protect' can be
controlled using DIP Switch SW5. To use NAND,
the switch must be configured like so:

SW5.1 (NAND_SELn) = ON (LOW)
SW5.9 (GPMC_WPN) = OFF (HIGH)
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Tested-by: NNishanth Menon <nm@ti.com>
Acked-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra72-evm.dts

@@ -26,6 +26,33 @@
 			0x404 (PIN_INPUT | MUX_MODE0) /* i2c1_scl.i2c1_scl */
 		>;
 	};
+
+	nand_default: nand_default {
+		pinctrl-single,pins = <
+			0x0	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad0 */
+			0x4	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad1 */
+			0x8	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad2 */
+			0xc	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad3 */
+			0x10	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad4 */
+			0x14	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad5 */
+			0x18	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad6 */
+			0x1c	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad7 */
+			0x20	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad8 */
+			0x24	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad9 */
+			0x28	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad10 */
+			0x2c	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad11 */
+			0x30	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad12 */
+			0x34	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad13 */
+			0x38	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad14 */
+			0x3c	(PIN_INPUT  | MUX_MODE0) /* gpmc_ad15 */
+			0xb4	(PIN_OUTPUT | MUX_MODE0) /* gpmc_cs0 */
+			0xc4	(PIN_OUTPUT | MUX_MODE0) /* gpmc_advn_ale */
+			0xcc	(PIN_OUTPUT | MUX_MODE0) /* gpmc_wen */
+			0xc8	(PIN_OUTPUT | MUX_MODE0) /* gpmc_oen_ren */
+			0xd0	(PIN_OUTPUT | MUX_MODE0) /* gpmc_ben0 */
+			0xd8	(PIN_INPUT  | MUX_MODE0) /* gpmc_wait0 */
+		>;
+	};
 };
 
 &i2c1 {
@@ -142,3 +169,91 @@
 &uart1 {
 	status = "okay";
 };
+
+&elm {
+	status = "okay";
+};
+
+&gpmc {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&nand_default>;
+	ranges = <0 0 0 0x01000000>;	/* minimum GPMC partition = 16MB */
+	nand@0,0 {
+		/* To use NAND, DIP switch SW5 must be set like so:
+		 * SW5.1 (NAND_SELn) = ON (LOW)
+		 * SW5.9 (GPMC_WPN) = OFF (HIGH)
+		 */
+		reg = <0 0 4>;		/* device IO registers */
+		ti,nand-ecc-opt = "bch8";
+		ti,elm-id = <&elm>;
+		nand-bus-width = <16>;
+		gpmc,device-width = <2>;
+		gpmc,sync-clk-ps = <0>;
+		gpmc,cs-on-ns = <0>;
+		gpmc,cs-rd-off-ns = <80>;
+		gpmc,cs-wr-off-ns = <80>;
+		gpmc,adv-on-ns = <0>;
+		gpmc,adv-rd-off-ns = <60>;
+		gpmc,adv-wr-off-ns = <60>;
+		gpmc,we-on-ns = <10>;
+		gpmc,we-off-ns = <50>;
+		gpmc,oe-on-ns = <4>;
+		gpmc,oe-off-ns = <40>;
+		gpmc,access-ns = <40>;
+		gpmc,wr-access-ns = <80>;
+		gpmc,rd-cycle-ns = <80>;
+		gpmc,wr-cycle-ns = <80>;
+		gpmc,bus-turnaround-ns = <0>;
+		gpmc,cycle2cycle-delay-ns = <0>;
+		gpmc,clk-activation-ns = <0>;
+		gpmc,wait-monitoring-ns = <0>;
+		gpmc,wr-data-mux-bus-ns = <0>;
+		/* MTD partition table */
+		/* All SPL-* partitions are sized to minimal length
+		 * which can be independently programmable. For
+		 * NAND flash this is equal to size of erase-block */
+		#address-cells = <1>;
+		#size-cells = <1>;
+		partition@0 {
+			label = "NAND.SPL";
+			reg = <0x00000000 0x000020000>;
+		};
+		partition@1 {
+			label = "NAND.SPL.backup1";
+			reg = <0x00020000 0x00020000>;
+		};
+		partition@2 {
+			label = "NAND.SPL.backup2";
+			reg = <0x00040000 0x00020000>;
+		};
+		partition@3 {
+			label = "NAND.SPL.backup3";
+			reg = <0x00060000 0x00020000>;
+		};
+		partition@4 {
+			label = "NAND.u-boot-spl-os";
+			reg = <0x00080000 0x00040000>;
+		};
+		partition@5 {
+			label = "NAND.u-boot";
+			reg = <0x000c0000 0x00100000>;
+		};
+		partition@6 {
+			label = "NAND.u-boot-env";
+			reg = <0x001c0000 0x00020000>;
+		};
+		partition@7 {
+			label = "NAND.u-boot-env.backup1";
+			reg = <0x001e0000 0x00020000>;
+		};
+		partition@8 {
+			label = "NAND.kernel";
+			reg = <0x00200000 0x00800000>;
+		};
+		partition@9 {
+			label = "NAND.file-system";
+			reg = <0x00a00000 0x0f600000>;
+		};
+	};
+};