diff --git a/target/linux/realtek/dts/rtl931x.dtsi b/target/linux/realtek/dts/rtl931x.dtsi
index eeda87ef23..d754ebd5a7 100644
--- a/target/linux/realtek/dts/rtl931x.dtsi
+++ b/target/linux/realtek/dts/rtl931x.dtsi
@@ -296,6 +296,36 @@
 		};
 	};
 
+	pinmux@1b00103c {
+		compatible = "pinctrl-single";
+		reg = <0x1b00103c 0x4>;
+
+		pinctrl-single,bit-per-mux;
+		pinctrl-single,register-width = <32>;
+		pinctrl-single,function-mask = <0x1>;
+		#pinctrl-cells = <2>;
+
+		/* 31.25 MHz SPI master clock */
+		pinmux_spi0_31mhz: spi0-31mhz {
+			pinctrl-single,bits = <0x0 0x1800 0x3800>;
+		};
+
+		/* Enable GPIO 8, 9, 10 */
+		pinmux_disable_spi0: disable-spi0 {
+			pinctrl-single,bits = <0x0 0x0 0x400>;
+		};
+
+		/* Enable GPIO 12 */
+		pinmux_disable_spi0_cs1: disable-spi-cs1 {
+			pinctrl-single,bits = <0x0 0x0 0x200>;
+		};
+
+		/* Enable GPIO 11 */
+		pinmux_disable_spi0_cs0: disable-spi-cs0 {
+			pinctrl-single,bits = <0x0 0x0 0x100>;
+		};
+	};
+
 	pinmux@1b001358 {
 		compatible = "pinctrl-single";
 		reg = <0x1b001358 0x4>;
diff --git a/target/linux/realtek/files-6.12/arch/mips/include/asm/mach-rtl838x/mach-rtl83xx.h b/target/linux/realtek/files-6.12/arch/mips/include/asm/mach-rtl838x/mach-rtl83xx.h
index 720dc4276f..364b66b73a 100644
--- a/target/linux/realtek/files-6.12/arch/mips/include/asm/mach-rtl838x/mach-rtl83xx.h
+++ b/target/linux/realtek/files-6.12/arch/mips/include/asm/mach-rtl838x/mach-rtl83xx.h
@@ -105,9 +105,6 @@
 #define RTL9300_FAMILY_ID		(0x9300)
 #define RTL9310_FAMILY_ID		(0x9310)
 
-/* SPI Support */
-#define RTL931X_SPI_CTRL0		(0x103C)
-
 /* Basic SoC Features */
 #define RTL838X_CPU_PORT		28
 #define RTL839X_CPU_PORT		52
diff --git a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
index 4b9ea3be68..99422d0d4c 100644
--- a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
+++ b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
@@ -1519,9 +1519,6 @@ static int rtl931x_chip_init(struct rtl838x_eth_priv *priv)
 	/* Enable ESD auto recovery */
 	sw_w32(0x1, RTL931X_MDX_CTRL_RSVD);
 
-	/* Init SPI, is this for thermal control or what? */
-	sw_w32_mask(0x7 << 11, 0x2 << 11, RTL931X_SPI_CTRL0);
-
 	return 0;
 }