Hello Paul,

[snip]

+
+&omap3_pmx_core {
+       pinctrl-names = "default";
+
+       uart3_pins: pinmux_uart3_pins {
+               pinctrl-single,pins = <
+                       0x16e (PIN_INPUT | MUX_MODE0)           /* uart3_rx_irrx */
+                       0x170 (PIN_OUTPUT | MUX_MODE0)          /* uart3_tx_irtx */
+               >;

Could you please use the IOPAD mux macros from
include/dt-bindings/pinctrl/omap.h instead?

We just did a massive cleanup on the OMAP DTS to use them instead of
an offset from the padconf registers.

Best regards,
Javier