diff --git a/arch/arm64/boot/dts/renesas/r9a08g046.dtsi b/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
index 19f2c9f29f5c..323e7d107a19 100644
--- a/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
@@ -257,10 +257,91 @@
 		};
 
 		i2c0: i2c@100ae000 {
+			compatible = "renesas,riic-r9a08g046", "renesas,riic-r9a09g057";
 			reg = <0 0x100ae000 0 0x400>;
+			interrupts = <GIC_SPI 322 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 328 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 329 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 324 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 325 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 323 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 326 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 327 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "tei", "ri", "ti", "spi", "sti",
+					  "naki", "ali", "tmoi";
+			clocks = <&cpg CPG_MOD R9A08G046_I2C0_PCLK>;
+			clock-frequency = <100000>;
+			resets = <&cpg R9A08G046_I2C0_MRST>;
+			power-domains = <&cpg>;
 			#address-cells = <1>;
 			#size-cells = <0>;
-			/* placeholder */
+			status = "disabled";
+		};
+
+		i2c1: i2c@10090400 {
+			compatible = "renesas,riic-r9a08g046", "renesas,riic-r9a09g057";
+			reg = <0 0x10090400 0 0x400>;
+			interrupts = <GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 336 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 337 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 332 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 333 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 331 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 334 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 335 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "tei", "ri", "ti", "spi", "sti",
+					  "naki", "ali", "tmoi";
+			clocks = <&cpg CPG_MOD R9A08G046_I2C1_PCLK>;
+			clock-frequency = <100000>;
+			resets = <&cpg R9A08G046_I2C1_MRST>;
+			power-domains = <&cpg>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
+		i2c2: i2c@10090800 {
+			compatible = "renesas,riic-r9a08g046", "renesas,riic-r9a09g057";
+			reg = <0 0x10090800 0 0x400>;
+			interrupts = <GIC_SPI 338 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 344 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 345 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 340 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 339 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 342 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 343 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "tei", "ri", "ti", "spi", "sti",
+					  "naki", "ali", "tmoi";
+			clocks = <&cpg CPG_MOD R9A08G046_I2C2_PCLK>;
+			clock-frequency = <100000>;
+			resets = <&cpg R9A08G046_I2C2_MRST>;
+			power-domains = <&cpg>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
+		i2c3: i2c@10090c00 {
+			compatible = "renesas,riic-r9a08g046", "renesas,riic-r9a09g057";
+			reg = <0 0x10090c00 0 0x400>;
+			interrupts = <GIC_SPI 346 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 352 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 353 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 348 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 349 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 347 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 350 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 351 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "tei", "ri", "ti", "spi", "sti",
+					  "naki", "ali", "tmoi";
+			clocks = <&cpg CPG_MOD R9A08G046_I2C3_PCLK>;
+			clock-frequency = <100000>;
+			resets = <&cpg R9A08G046_I2C3_MRST>;
+			power-domains = <&cpg>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
 		};
 
 		canfd: can@100c0000 {
diff --git a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
index b28e59a65259..7770de2064d9 100644
--- a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
@@ -11,6 +11,7 @@
 	aliases {
 		ethernet0 = &eth0;
 		ethernet1 = &eth1;
+		i2c0 = &i2c0;
 	};
 
 	memory@48000000 {
@@ -50,6 +51,11 @@
 	clock-frequency = <24000000>;
 };
 
+&i2c0 {
+	pinctrl-0 = <&i2c0_pins>;
+	pinctrl-names = "default";
+};
+
 &mdio0 {
 	phy0: ethernet-phy@7 {
 		compatible = "ethernet-phy-id0022.1640";
@@ -144,6 +150,11 @@
 				 power-source = <1800>;
 		};
 	};
+
+	i2c0_pins: i2c0 {
+		pinmux = <RZG3L_PORT_PINMUX(L, 2, 4)>, /* RIIC0_SCL */
+			 <RZG3L_PORT_PINMUX(L, 3, 4)>; /* RIIC0_SDA */
+	};
 };
 
 &wdt0 {