Add main_uart1 description in sk devicetree.

This is a pending upstream kernel updates as of v6.3-rc6.

Signed-off-by: Nishanth Menon <n...@ti.com>
---
Sent to kernel.org 
https://lore.kernel.org/linux-devicetree/20230414073328.381336-1...@ti.com/

 arch/arm/dts/k3-am642-sk.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/dts/k3-am642-sk.dts b/arch/arm/dts/k3-am642-sk.dts
index cc2027417e86..a0431ad374a5 100644
--- a/arch/arm/dts/k3-am642-sk.dts
+++ b/arch/arm/dts/k3-am642-sk.dts
@@ -246,6 +246,16 @@
                >;
        };
 
+       /* XXX: Kernel-Upstream: TODO: Upstream */
+       main_uart1_pins_default: main-uart1-pins-default {
+               pinctrl-single,pins = <
+                       AM64X_IOPAD(0x0248, PIN_INPUT, 0) /* (D16) UART1_CTSn */
+                       AM64X_IOPAD(0x024c, PIN_OUTPUT, 0) /* (E16) UART1_RTSn 
*/
+                       AM64X_IOPAD(0x0240, PIN_INPUT, 0) /* (E15) UART1_RXD */
+                       AM64X_IOPAD(0x0244, PIN_OUTPUT, 0) /* (E14) UART1_TXD */
+               >;
+       };
+
        main_usb0_pins_default: main-usb0-pins-default {
                pinctrl-single,pins = <
                        AM64X_IOPAD(0x02a8, PIN_OUTPUT, 0) /* (E19) 
USB0_DRVVBUS */
@@ -349,6 +359,9 @@
 &main_uart1 {
        /* main_uart1 is reserved for firmware usage */
        status = "reserved";
+       /* XXX: Kernel-Upstream: TODO: Upstream pinmux */
+       pinctrl-names = "default";
+       pinctrl-0 = <&main_uart1_pins_default>;
 };
 
 &main_i2c1 {
-- 
2.40.0

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