8.3 DTS Settings for SDIO Interface

To configure the SDIO interface for the WILCS02 on the SAMA5D27-SOM1-EK1 platform, you need to set the interrupt-parent and interrupts properties of the mmc node in the Device Tree Source (DTS) file. Although the IRQN pin does not have a feature in the current firmware, use it for host wake-up in the future.

The WILCS02 does not support similar pins for CHIP_EN and RESET, but define the dummy pins in the device tree for driver compatibility.

&sdmmc0 {
	bus-width = <4>;
	status = "okay";

	wifi_sdio@1 {
		compatible = "microchip,wilc1000", "microchip,wilc3000";
		interrupt-parent = <&pioA>;
		interrupts = <PIN_PA8 0>;
		reset-gpios = <&pioA PIN_PA25 0>;   //dummy pin
		chip_en-gpios = <&pioA PIN_PA26 0>;  //dummy pin
		reg = <0>;
		bus-width = <4>;
		status = "okay";
	};
};