mtd: add LPC32xx SLC NAND driver

This patch adds support for the SLC NAND controller inside the LPC32xx SoC.

[dwmw2: 21st century pedantry]

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

Documentation/devicetree/bindings/mtd/lpc32xx-slc.txt

@@ -0,0 +1,52 @@
+NXP LPC32xx SoC NAND SLC controller
+
+Required properties:
+- compatible: "nxp,lpc3220-slc"
+- reg: Address and size of the controller
+- nand-on-flash-bbt: Use bad block table on flash
+- gpios: GPIO specification for NAND write protect
+
+The following required properties are very controller specific. See the LPC32xx
+User Manual:
+- nxp,wdr-clks: Delay before Ready signal is tested on write (W_RDY)
+- nxp,rdr-clks: Delay before Ready signal is tested on read (R_RDY)
+(The following values are specified in Hz, to make them independent of actual
+clock speed:)
+- nxp,wwidth: Write pulse width (W_WIDTH)
+- nxp,whold: Write hold time (W_HOLD)
+- nxp,wsetup: Write setup time (W_SETUP)
+- nxp,rwidth: Read pulse width (R_WIDTH)
+- nxp,rhold: Read hold time (R_HOLD)
+- nxp,rsetup: Read setup time (R_SETUP)
+
+Optional subnodes:
+- Partitions, see Documentation/devicetree/bindings/mtd/partition.txt
+
+Example:
+
+	slc: flash@20020000 {
+		compatible = "nxp,lpc3220-slc";
+		reg = <0x20020000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		nxp,wdr-clks = <14>;
+		nxp,wwidth = <40000000>;
+		nxp,whold = <100000000>;
+		nxp,wsetup = <100000000>;
+		nxp,rdr-clks = <14>;
+		nxp,rwidth = <40000000>;
+		nxp,rhold = <66666666>;
+		nxp,rsetup = <100000000>;
+		nand-on-flash-bbt;
+		gpios = <&gpio 5 19 1>; /* GPO_P3 19, active low */
+
+		mtd0@00000000 {
+			label = "phy3250-boot";
+			reg = <0x00000000 0x00064000>;
+			read-only;
+		};
+
+		...
+
+	};