ARM: BCM53016: MR32: convert to Broadcom iProc I2C Driver

replaces the bit-banged i2c-gpio provided i2c functionality
with the hardware in the SoC.

During review of the MR32, Florian Fainelli pointed out that the
SoC has a real I2C-controller. Furthermore, the connected pins
(SDA and SCL) would line up perfectly for use. Back then I couldn't
get it working though and I left it with i2c-gpio (which worked).

Now we know the reason: the interrupt was incorrectly specified.
(Hence, this patch depends on Florian Fainelli's
"ARM: dts: BCM5301X: Fix I2C controller interrupt" patch).

Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: Matthew Hagan <mnhagan88@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm53016-meraki-mr32.dts

@@ -84,40 +84,6 @@ blue {
 			max-brightness = <255>;
 		};
 	};
-
-	i2c {
-		/*
-		 * The platform provided I2C does not budge.
-		 * This is a replacement until I can figure
-		 * out what are the missing bits...
-		 */
-
-		compatible = "i2c-gpio";
-		sda-gpios = <&chipcommon 5 GPIO_ACTIVE_HIGH>;
-		scl-gpios = <&chipcommon 4 GPIO_ACTIVE_HIGH>;
-		i2c-gpio,delay-us = <10>; /* close to 100 kHz */
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		current_sense: ina219@45 {
-			compatible = "ti,ina219";
-			reg = <0x45>;
-			shunt-resistor = <60000>; /* = 60 mOhms */
-		};
-
-		eeprom: eeprom@50 {
-			compatible = "atmel,24c64";
-			reg = <0x50>;
-			pagesize = <32>;
-			read-only;
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			mac_address: mac-address@66 {
-				reg = <0x66 0x6>;
-			};
-		};
-	};
 };
 
 &uart0 {
@@ -228,3 +194,31 @@ fixed-link {
 		};
 	};
 };
+
+&i2c0 {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinmux_i2c>;
+
+	clock-frequency = <100000>;
+
+	current_sense: ina219@45 {
+		compatible = "ti,ina219";
+		reg = <0x45>;
+		shunt-resistor = <60000>; /* = 60 mOhms */
+	};
+
+	eeprom: eeprom@50 {
+		compatible = "atmel,24c64";
+		reg = <0x50>;
+		pagesize = <32>;
+		read-only;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		mac_address: mac-address@66 {
+			reg = <0x66 0x6>;
+		};
+	};
+};