ARM: dts: rza2mevb: Add I2C EEPROM support

Enable the third I2C channel, and describe the I2C EEPROM connected to
it.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/786f0354fb30b183d5bccb2f12b13e6535b9ace1.1626267234.git.geert+renesas@glider.be

arch/arm/boot/dts/r7s9210-rza2mevb.dts

@@ -109,6 +109,20 @@ &extal_clk {
 	clock-frequency = <24000000>;	/* 24MHz */
 };
 
+&i2c3 {
+	status = "okay";
+	clock-frequency = <400000>;
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+
+	eeprom@50 {
+		compatible = "renesas,r1ex24128", "atmel,24c128";
+		reg = <0x50>;
+		pagesize = <64>;
+	};
+};
+
 /* High resolution System tick timers */
 &ostm0 {
 	status = "okay";
@@ -147,6 +161,11 @@ eth1_pins: eth1 {
 			 <RZA2_PINMUX(PORTL, 1, 5)>; /* IRQ5 */
 	};
 
+	i2c3_pins: i2c3 {
+		pinmux = <RZA2_PINMUX(PORTD, 6, 1)>,	/* RIIC3SCL */
+			 <RZA2_PINMUX(PORTD, 7, 1)>;	/* RIIC3SDA */
+	};
+
 	keyboard_pins: keyboard {
 		pinmux = <RZA2_PINMUX(PORTJ, 1, 6)>;	/* IRQ0 */
 	};