kirkwood: add nsa310b dtb, a zyxel nsa310 variant

add support to a nsa310 variant with red/green usb led
and lm85 temp/fan controller

Signed-off-by: Alberto Bursi <alberto.bursi@outlook.it>

NOTE: this patch can be upstreamed as-is, LEDE-specific
		nand partitions are set in another patch

--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -268,6 +268,7 @@ dtb-$(CONFIG_MACH_KIRKWOOD) += \
 	kirkwood-ns2mini.dtb \
 	kirkwood-nsa310.dtb \
 	kirkwood-nsa310a.dtb \
+	kirkwood-nsa310b.dtb \
 	kirkwood-nsa320.dtb \
 	kirkwood-nsa325.dtb \
 	kirkwood-openblocks_a6.dtb \
--- /dev/null
+++ b/arch/arm/boot/dts/kirkwood-nsa310b.dts
@@ -0,0 +1,124 @@
+/dts-v1/;
+
+#include "kirkwood-nsa3x0-common.dtsi"
+
+/*
+ * There are at least two different NSA310 designs. This variant has
+ * a red/green USB Led (same as nsa310) and a lm85 temp/fan controller.
+ */
+
+/ {
+	model = "ZyXEL NSA310b";
+	compatible = "zyxel,nsa310b", "zyxel,nsa310", "marvell,kirkwood-88f6281", "marvell,kirkwood";
+
+	memory {
+		device_type = "memory";
+		reg = <0x00000000 0x10000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+		stdout-path = &uart0;
+	};
+
+	ocp@f1000000 {
+		pinctrl: pin-controller@10000 {
+			pinctrl-names = "default";
+
+			pmx_led_esata_green: pmx-led-esata-green {
+				marvell,pins = "mpp12";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_esata_red: pmx-led-esata-red {
+				marvell,pins = "mpp13";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_usb_green: pmx-led-usb-green {
+				marvell,pins = "mpp15";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_usb_red: pmx-led-usb-red {
+				marvell,pins = "mpp16";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_sys_green: pmx-led-sys-green {
+				marvell,pins = "mpp28";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_sys_red: pmx-led-sys-red {
+				marvell,pins = "mpp29";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_hdd_green: pmx-led-hdd-green {
+				marvell,pins = "mpp41";
+				marvell,function = "gpio";
+			};
+
+			pmx_led_hdd_red: pmx-led-hdd-red {
+				marvell,pins = "mpp42";
+				marvell,function = "gpio";
+			};
+
+		};
+
+		i2c@11000 {
+			status = "okay";
+
+			lm85: lm85@2e {
+				compatible = "national,lm85";
+				reg = <0x2e>;
+			};
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		green-sys {
+			label = "nsa310:green:sys";
+			gpios = <&gpio0 28 GPIO_ACTIVE_HIGH>;
+		};
+		red-sys {
+			label = "nsa310:red:sys";
+			gpios = <&gpio0 29 GPIO_ACTIVE_HIGH>;
+		};
+		green-hdd {
+			label = "nsa310:green:hdd";
+			gpios = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+		};
+		red-hdd {
+			label = "nsa310:red:hdd";
+			gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		};
+		green-esata {
+			label = "nsa310:green:esata";
+			gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+		};
+		red-esata {
+			label = "nsa310:red:esata";
+			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+		};
+		green-usb {
+			label = "nsa310:green:usb";
+			gpios = <&gpio0 15 GPIO_ACTIVE_HIGH>;
+		};
+		red-usb {
+			label = "nsa310:red:usb";
+			gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
+		};
+		green-copy {
+			label = "nsa310:green:copy";
+			gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
+		};
+		red-copy {
+			label = "nsa310:red:copy";
+			gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};