samples/sensor/bme280/boards/rpi_pico.overlay

&spi0 {
	status = "okay";
	cs-gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
	pinctrl-0 = <&spi0_default>;
	bme280@0 {
		compatible = "bosch,bme280";
		reg = <0>;
		spi-max-frequency = <1000000>; /* conservatively set to 1MHz */
	};
};