BCM270X_DT: Add DS1339 to i2c-rtc overlay

Author: nboullis

arch/arm/boot/dts/overlays/README

@@ -371,6 +371,8 @@ Info:   Adds support for a number of I2C Real Time Clock devices
 Load:   dtoverlay=i2c-rtc,<param>=<val>
 Params: ds1307                  Select the DS1307 device
 
+        ds1339                  Select the DS1339 device
+
         ds3231                  Select the DS3231 device
 
         mcp7941x                Select the MCP7941x device
@@ -381,6 +383,8 @@ Params: ds1307                  Select the DS1307 device
 
         pcf8563                 Select the PCF8563 device
 
+        trickle-resistor-ohms   Resistor value for trickle charge (DS1339-only)
+
 
 Name:   i2c0-bcm2708
 Info:   Enable the i2c_bcm2708 driver for the i2c0 bus

arch/arm/boot/dts/overlays/i2c-rtc-overlay.dts

@@ -17,6 +17,12 @@
 				reg = <0x68>;
 				status = "disable";
 			};
+			ds1339: ds1339@68 {
+				compatible = "dallas,ds1339";
+				trickle-resistor-ohms = <0>;
+				reg = <0x68>;
+				status = "disable";
+			};
 			mcp7941x: mcp7941x@6f {
 				compatible = "microchip,mcp7941x";
 				reg = <0x6f>;
@@ -46,10 +52,12 @@
 	};
 	__overrides__ {
 		ds1307 = <&ds1307>,"status";
+		ds1339 = <&ds1339>,"status";
 		ds3231 = <&ds3231>,"status";
 		mcp7941x = <&mcp7941x>,"status";
 		pcf2127 = <&pcf2127>,"status";
 		pcf8523 = <&pcf8523>,"status";
 		pcf8563 = <&pcf8563>,"status";
+		trickle-resistor-ohms = <&ds1339>,"trickle-resistor-ohms:0";
 	};
 };