arm64: dts: ti: k3-am654-base-board: Add missing pinmux wkup_uart, mcu_uart and mcu_i2c

Many of the definitions depend on pinmux done by the bootloader. Be
explicit about the pinmux for functionality and completeness.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kamlesh Gurudasani <kamlesh@ti.com>
Link: https://lore.kernel.org/r/20230419225913.663448-2-nm@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am654-base-board.dts

@@ -119,6 +119,15 @@ vdd_mmc1_sd: fixedregulator-sd {
 };
 
 &wkup_pmx0 {
+	wkup_uart0_pins_default: wkup-uart0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_WKUP_IOPAD(0x00a0, PIN_INPUT, 0)	/* (AB1) WKUP_UART0_RXD */
+			AM65X_WKUP_IOPAD(0x00a4, PIN_OUTPUT, 0)	/* (AB5) WKUP_UART0_TXD */
+			AM65X_WKUP_IOPAD(0x00c8, PIN_INPUT, 1)	/* (AC2) WKUP_GPIO0_6.WKUP_UART0_CTSn */
+			AM65X_WKUP_IOPAD(0x00cc, PIN_OUTPUT, 1)	/* (AC1) WKUP_GPIO0_7.WKUP_UART0_RTSn */
+		>;
+	};
+
 	wkup_i2c0_pins_default: wkup-i2c0-pins-default {
 		pinctrl-single,pins = <
 			AM65X_WKUP_IOPAD(0x00e0, PIN_INPUT, 0) /* (AC7) WKUP_I2C0_SCL */
@@ -155,6 +164,15 @@ AM65X_WKUP_IOPAD(0x0034, PIN_INPUT, 7) /* (T1) MCU_OSPI1_CLK.WKUP_GPIO0_25 */
 		>;
 	};
 
+	mcu_uart0_pins_default: mcu-uart0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_WKUP_IOPAD(0x0044, PIN_INPUT, 4)	/* (P4) MCU_OSPI1_D1.MCU_UART0_RXD */
+			AM65X_WKUP_IOPAD(0x0048, PIN_OUTPUT, 4)	/* (P5) MCU_OSPI1_D2.MCU_UART0_TXD */
+			AM65X_WKUP_IOPAD(0x004C, PIN_INPUT, 4)	/* (P1) MCU_OSPI1_D3.MCU_UART0_CTSn */
+			AM65X_WKUP_IOPAD(0x0054, PIN_OUTPUT, 4)	/* (N3) MCU_OSPI1_CSn1.MCU_UART0_RTSn */
+		>;
+	};
+
 	mcu_cpsw_pins_default: mcu-cpsw-pins-default {
 		pinctrl-single,pins = <
 			AM65X_WKUP_IOPAD(0x0058, PIN_OUTPUT, 0) /* (N4) MCU_RGMII1_TX_CTL */
@@ -178,6 +196,13 @@ AM65X_WKUP_IOPAD(0x008c, PIN_OUTPUT, 0) /* (L1) MCU_MDIO0_MDC */
 			AM65X_WKUP_IOPAD(0x0088, PIN_INPUT, 0) /* (L4) MCU_MDIO0_MDIO */
 		>;
 	};
+
+	mcu_i2c0_pins_default: mcu-i2c0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_WKUP_IOPAD(0x00e8, PIN_INPUT,  0) /* (AD8) MCU_I2C0_SCL */
+			AM65X_WKUP_IOPAD(0x00ec, PIN_INPUT,  0) /* (AD7) MCU_I2C0_SDA */
+		>;
+	};
 };
 
 &main_pmx0 {
@@ -268,11 +293,14 @@ AM65X_IOPAD(0x0010, PIN_INPUT, 0) /* (D21) ECAP0_IN_APWM_OUT */
 &wkup_uart0 {
 	/* Wakeup UART is used by System firmware */
 	status = "reserved";
+	pinctrl-names = "default";
+	pinctrl-0 = <&wkup_uart0_pins_default>;
 };
 
 &mcu_uart0 {
 	status = "okay";
-	/* Default pinmux */
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcu_uart0_pins_default>;
 };
 
 &main_uart0 {
@@ -304,7 +332,9 @@ pca9554: gpio@39 {
 
 &mcu_i2c0 {
 	status = "okay";
-	/* Default pinmux */
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcu_i2c0_pins_default>;
+	clock-frequency = <400000>;
 };
 
 &main_i2c0 {