dtp does not include GPIO PIN names

[Rastafabisch]

I just flashed the rock-5b_bookworm-v12-6.6.img.xz image.

Now I got a slight problem: I can't sanely control my GPIO pins anymore. I used to do this via (lib)gpiod and the gpioset $(gpiofind PIN_XY)=A command.
That worked just fine on Radxa's latest Debian release.
However it does not wo here, because apparently the PIN names are not defined in the DeviceTree.

[Rastafabisch]

Well, I fixed it myself. I tried using a .dtbo file and adding fdtoverlay /boot/overlay/GPIO-line-names.dbto but couldn't get this to work. (The Rock would just fail to boot.) I ended up uncomplying the default .dtb file and recompile it with GPIO descriptions.
In case someone would like to have it: GPIO-line-names.zip (They have been updated to the ones from the 6.7 rc1 kernel.)

That said a follow up to my question would be how to load .dtbo files - especially ones describing GPIO addresses, as those won't even compile from .dts to .dbto.

[inindev]

I am not actively developing code for the rock-5b and am pretty much tracking Sebastian Reichel's patches from here: https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-misc.git/log/?h=rk3588

I will state this more clearly on the project page as the goal here is to track mainline Linux development for the rock-5b. Thank you for the report though, and I will keep this open for others to find until this gets added to the mainline device tree.

[Rastafabisch]

I managed to come up with a .dts file which does apply and injects the GPIO PIN names.

rk3588-rock-5b-gpio-line-names.dts

/dts-v1/;
/plugin/;

/ {
	compatible = "radxa,rock-5b", "rockchip,rk3588";
};

&{/} {
	pinctrl {
gpio@fd8a0000 {
	gpio-line-names =
		/* GPIO0_A0-A3 */
		"", "", "", "",
		/* GPIO0_A4-A7 */
		"", "", "", "",

		/* GPIO0_B0-B3 */
		"", "", "", "",
		/* GPIO0_B4-B7 */
		"", "PIN_8", "PIN_10", "",

		/* GPIO0_C0-C3 */
		"", "", "", "",
		/* GPIO0_C4-C7 */
		"", "", "", "",

		/* GPIO0_D0-D3 */
		"", "", "", "",
		/* GPIO0_D4-D7 */
		"", "", "", "";
};

gpio@fec20000 {
	gpio-line-names =
		/* GPIO1_A0-A3 */
		"", "", "", "",
		/* GPIO1_A4-A7 */
		"", "", "", "",

		/* GPIO1_B0-B3 */
		"", "PIN_21", "PIN_19", "PIN_23",
		/* GPIO1_B4-B7 */
		"PIN_24", "PIN_26", "", "PIN_31",

		/* GPIO1_C0-C3 */
		"", "", "", "",
		/* GPIO1_C4-C7 */
		"", "", "", "",

		/* GPIO1_D0-D3 */
		"", "", "", "",
		/* GPIO1_D4-D7 */
		"", "", "", "PIN_29";
};

gpio@fec30000 {
	gpio-line-names =
		/* GPIO2_A0-A3 */
		"", "", "", "",
		/* GPIO2_A4-A7 */
		"", "", "", "",

		/* GPIO2_B0-B3 */
		"", "", "", "",
		/* GPIO2_B4-B7 */
		"", "", "", "",

		/* GPIO2_C0-C3 */
		"", "", "", "",
		/* GPIO2_C4-C7 */
		"", "", "", "",

		/* GPIO2_D0-D3 */
		"", "", "", "",
		/* GPIO2_D4-D7 */
		"", "", "", "";
};

gpio@fec40000 {
	gpio-line-names =
		/* GPIO3_A0-A3 */
		"", "", "", "",
		/* GPIO3_A4-A7 */
		"PIN_16", "", "", "PIN_33",

		/* GPIO3_B0-B3 */
		"", "PIN_36", "PIN_38", "PIN_40",
		/* GPIO3_B4-B7 */
		"", "PIN_12", "PIN_35", "PIN_13",

		/* GPIO3_C0-C3 */
		"PIN_15", "PIN_11", "PIN_32", "PIN_7",
		/* GPIO3_C4-C7 */
		"", "", "", "",

		/* GPIO3_D0-D3 */
		"", "", "", "",
		/* GPIO3_D4-D7 */
		"", "", "", "";
};

gpio@fec50000 {

	gpio-line-names =
		/* GPIO4_A0-A3 */
		"", "", "", "",
		/* GPIO4_A4-A7 */
		"", "", "", "",

		/* GPIO4_B0-B3 */
		"", "", "PIN_5", "PIN_3",
		/* GPIO4_B4-B7 */
		"", "", "", "",

		/* GPIO4_C0-C3 */
		"", "", "", "",
		/* GPIO4_C4-C7 */
		"PIN_18", "PIN_28", "PIN_27", "",

		/* GPIO4_D0-D3 */
		"", "", "", "",
		/* GPIO4_D4-D7 */
		"", "", "", "";
		};
	};
};

This just needs to be compiled using dtc, and than referenced under fdt in the /boot/extlinux/extlinux.conf configuration file like fdtoverlays /boot/overlays/rk3588-rock-5b-gpio-line-names.dtbo.