smi-nand-overlay.dts

// Description: Overlay to enable NAND flash through
// the secondary memory interface
// Author:	Luke Wren

/dts-v1/;
/plugin/;

/{
	compatible = "brcm,bcm2708";

	fragment@0 {
		target = <&smi>;
		__overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&smi_pins>;
			status = "okay";
		};
	};

	fragment@1 {
		target = <&soc>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <1>;

			nand: flash@0 {
				compatible = "brcm,bcm2835-smi-nand";
				smi_handle = <&smi>;
				#address-cells = <1>;
				#size-cells = <1>;
				status = "okay";

				partition@0 {
					label = "stage2";
					// 128k
					reg = <0 0x20000>;
					read-only;
				};
				partition@1 {
					label = "firmware";
					// 16M
					reg = <0x20000 0x1000000>;
					read-only;
				};
				partition@2 {
					label = "root";
					// 2G (will need to use 64 bit for >=4G)
					reg = <0x1020000 0x80000000>;
				};
			};
		};
	};

	fragment@2 {
		target = <&gpio>;
		__overlay__ {
			smi_pins: smi_pins {
				brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11
					12 13 14 15>;
				/* Alt 1: SMI */
				brcm,function = <5 5 5 5 5 5 5 5 5 5 5
					5 5 5 5 5>;
				/* /CS, /WE and /OE are pulled high, as they are
				   generally active low signals */
				brcm,pull = <2 2 2 2 2 2 2 2 0 0 0 0 0 0 0 0>;
			};
		};
	};
};