Migrating from Debian 10 → 13 broke GPIO switch on P9_19

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So, what your really missing from your current overlay: BeagleBoard-DeviceTrees/src/arm/overlays/BONE-LED-P9-19.dtso at v6.16.x · beagleboard/BeagleBoard-DeviceTrees · GitHub

P9.19/P9.1x: remove pinmux from i2c2: (overlays can’t delete, so we cheat by “appending” empty…)

&i2c2 {
	pinctrl-0 = <>;
	status = "disabled";
};

This free’s up P9.19 for normal use.

In the BONE-LED-P9-19.dtso i tied P9.19 to thru:

	leds {
		pinctrl-names = "default";
		pinctrl-0 = <&bb_gpio_p9_19_pins>;

		compatible = "gpio-leds";

		pin@919 {
			label = "P9_19";
			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
			default-state = "keep";
		};
	};

But really, you could add it to your BB-UART1-00A0 overlay.. It just has to be called from somewhere in am33xx_pinmux…

&am33xx_pinmux {
	pinctrl-names = "default";
	pinctrl-0 = <&rts_p9_19_pins>;

	rts_p9_19_pins: pinmux_rts_p9_19_pins {
		pinctrl-single,pins = <0x17C 0x07>; /* P9_19 as GPIO */
	};
};
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