ARM: davinci: da850: add pinctrl driver DT entries

For DT, DaVinci platform can use pinctrl-single driver for handling
padconf registers.

Enable PINCTRL Kconfig for MACH_DA8XX_DT platform. Add required
pinctrl DT entries in da850 dts file.

 Test procedure
  1)Populate DT file with NAND node information.
  2)Populate board DT file with pinmux information for NAND.
  3)Boot and confirm NAND is detected by the kernel.
  4)cat /proc/mtd to show partitions.

Signed-off-by: Kumar, Anil <anilkumar.v@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/boot/dts/da850-evm.dts

@@ -15,6 +15,9 @@
 	model = "DA850/AM1808/OMAP-L138 EVM";
 
 	soc {
+		pmx_core: pinmux@1c14120 {
+			status = "okay";
+		};
 		serial0: serial@1c42000 {
 			status = "okay";
 		};

arch/arm/boot/dts/da850.dtsi

@@ -29,6 +29,16 @@
 		#size-cells = <1>;
 		ranges = <0x0 0x01c00000 0x400000>;
 
+		pmx_core: pinmux@1c14120 {
+			compatible = "pinctrl-single";
+			reg = <0x14120 0x50>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			pinctrl-single,bit-per-mux;
+			pinctrl-single,register-width = <32>;
+			pinctrl-single,function-mask = <0xffffffff>;
+			status = "disabled";
+		};
 		serial0: serial@1c42000 {
 			compatible = "ns16550a";
 			reg = <0x42000 0x100>;

arch/arm/mach-davinci/Kconfig

@@ -62,6 +62,7 @@ config MACH_DA8XX_DT
 	bool "Support DA8XX platforms using device tree"
 	default y
 	depends on ARCH_DAVINCI_DA8XX
+	select PINCTRL
 	help
 	  Say y here to include support for TI DaVinci DA850 based using
 	  Flattened Device Tree. More information at Documentation/devicetree