diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
index b691304d4b74..b098dbd0e7a1 100644
--- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
+++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
@@ -5,6 +5,7 @@
  */
 
 #include "k3.dtsi"
+#include "k3-pinctrl.dtsi"
 
 / {
 	model = "SpacemiT K3 Pico-ITX";
@@ -25,5 +26,7 @@
 };
 
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_0_cfg>;
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi
new file mode 100644
index 000000000000..efb0f1572188
--- /dev/null
+++ b/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (c) 2026 Yixun Lan <dlan@kernel.org>
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+#define K3_PADCONF(pin, func) (((pin) << 16) | (func))
+
+/* Map GPIO pin to each bank's <index, offset> */
+#define K3_GPIO(x)	(x / 32) (x % 32)
+
+&pinctrl {
+	/omit-if-no-ref/
+	uart0_0_cfg: uart0-0-cfg {
+		uart0-0-pins {
+			pinmux = <K3_PADCONF(149, 2)>,	/* uart0 tx */
+				 <K3_PADCONF(150, 2)>;	/* uart0 rx */
+
+			bias-pull-up = <0>;
+			drive-strength = <25>;
+		};
+	};
+};
diff --git a/arch/riscv/boot/dts/spacemit/k3.dtsi b/arch/riscv/boot/dts/spacemit/k3.dtsi
index 3683a1a65362..a3a8ceddabec 100644
--- a/arch/riscv/boot/dts/spacemit/k3.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k3.dtsi
@@ -5,6 +5,7 @@
  */
 
 #include <dt-bindings/clock/spacemit,k3-clocks.h>
+#include <dt-bindings/reset/spacemit,k3-resets.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 
 /dts-v1/;
@@ -451,7 +452,10 @@
 			reg = <0x0 0xd4017000 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART0>,
+				 <&syscon_apbc CLK_APBC_UART0_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART0>;
 			interrupts = <42 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -461,7 +465,10 @@
 			reg = <0x0 0xd4017100 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART2>,
+				 <&syscon_apbc CLK_APBC_UART2_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART2>;
 			interrupts = <44 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -471,7 +478,10 @@
 			reg = <0x0 0xd4017200 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART3>,
+				 <&syscon_apbc CLK_APBC_UART3_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART3>;
 			interrupts = <45 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -481,7 +491,10 @@
 			reg = <0x0 0xd4017300 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART4>,
+				 <&syscon_apbc CLK_APBC_UART4_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART4>;
 			interrupts = <46 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -491,7 +504,10 @@
 			reg = <0x0 0xd4017400 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART5>,
+				 <&syscon_apbc CLK_APBC_UART5_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART5>;
 			interrupts = <47 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -501,7 +517,10 @@
 			reg = <0x0 0xd4017500 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART6>,
+				 <&syscon_apbc CLK_APBC_UART6_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART6>;
 			interrupts = <48 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -511,7 +530,10 @@
 			reg = <0x0 0xd4017600 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART7>,
+				 <&syscon_apbc CLK_APBC_UART7_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART7>;
 			interrupts = <49 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -521,7 +543,10 @@
 			reg = <0x0 0xd4017700 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART8>,
+				 <&syscon_apbc CLK_APBC_UART8_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART8>;
 			interrupts = <50 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -531,7 +556,10 @@
 			reg = <0x0 0xd4017800 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART9>,
+				 <&syscon_apbc CLK_APBC_UART9_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART9>;
 			interrupts = <51 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};
@@ -567,7 +595,10 @@
 			reg = <0x0 0xd401f000 0x0 0x100>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
-			clock-frequency = <14700000>;
+			clocks = <&syscon_apbc CLK_APBC_UART10>,
+				 <&syscon_apbc CLK_APBC_UART10_BUS>;
+			clock-names = "core", "bus";
+			resets = <&syscon_apbc RESET_APBC_UART10>;
 			interrupts = <281 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";
 		};