SPI MISO conflicts with data/command (ROCK 5B and maybe other boards)

[Gadgetoid]

After much tinkering I came up with this dtoverlay which configures ROCK 5Bs spi0-m2-cs1 to skip over the MISO pin, so it can be used for data/command:

/dts-v1/;
/plugin/;

/ {
	fragment@0 {
		target = <&spi0>;

		__overlay__ {
			status = "okay";
			#address-cells = <1>;
			#size-cells = <0>;
			pinctrl-names = "default";
			pinctrl-0 = <&spi0m2_cs1 &spi0m2_nomiso_pins>;
			max-freq = <50000000>;

			spidev@1 {
				compatible = "rockchip,spidev";
				status = "okay";
				reg = <1>;
				spi-max-frequency = <50000000>;
			};
		};
	};
	fragment@1 {
		target = <&pinctrl>;

		__overlay__ {

			spi0 {

				spi0m2_nomiso_pins: spi0m2-nomiso-pins {
					rockchip,pins =
						/* spi0_clk_m2 */
						<1 11 8 &pcfg_pull_up_drv_level_6>,
						/* spi0_miso_m2 */
						/*<1 9 8 &pcfg_pull_up_drv_level_6>,*/
						/* spi0_mosi_m2 */
						<1 10 8 &pcfg_pull_up_drv_level_6>;
				};
			};
		};
	};
};

Install with: sudo armbian-add-overlay rk3588-spi0-m2-cs1-nomiso-spidev.dts

Something like this might be needed for Raspberry Pi 5, so I figured out the dtoverlay magic on ROCK while I was waiting for the SPI to be fixed...