arm64: dts: renesas: spider-cpu: Add I2C4 and EEPROMs

Enable the I2C4 bus on the Falcon CPU board, and describe the I2C EEPROMs
present on the Spider CPU and BreakOut boards.

Extracted from a larger patch in the BSP by LUU HOAI.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Wolfram Sang <[e-mail]>
Link: https://lore.kernel.org/r/6d891[e-mail]

arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi

···
 	clock-frequency = <32768>;
 };
 
+&i2c4 {
+	pinctrl-0 = <&i2c4_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+	clock-frequency = <400000>;
+
+	eeprom@50 {
+		compatible = "rohm,br24g01", "atmel,24c01";
+		label = "cpu-board";
+		reg = <0x50>;
+		pagesize = <8>;
+	};
+};
+
 &pfc {
 	pinctrl-0 = <&scif_clk_pins>;
 	pinctrl-names = "default";
+
+	i2c4_pins: i2c4 {
+		groups = "i2c4";
+		function = "i2c4";
+	};
 
 	scif3_pins: scif3 {
 		groups = "scif3_data", "scif3_ctrl";

arch/arm64/boot/dts/renesas/r8a779f0-spider.dts

···
 		stdout-path = "serial0:115200n8";
 	};
 };
+
+&i2c4 {
+	eeprom@51 {
+		compatible = "rohm,br24g01", "atmel,24c01";
+		label = "breakout-board";
+		reg = <0x51>;
+		pagesize = <8>;
+	};
+};