Brooklyn/arch/arm/boot/dts/overlays/balena-fin-overlay.dts

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>

/{
	compatible = "brcm,bcm2835";

	fragment@0 {
		target = <&mmcnr>;
		__overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&sdio_pins>;
			bus-width = <4>;
			brcm,overclock-50 = <35>;
			status = "okay";
		};
	};

	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			sdio_pins: sdio_pins {
				brcm,pins = <34 35 36 37 38 39>;
				brcm,function = <7>; /* ALT3 = SD1 */
				brcm,pull = <0 2 2 2 2 2>;
			};

			power_ctrl_pins: power_ctrl_pins {
				brcm,pins = <40>;
				brcm,function = <1>; // out
			};
		};
	};

	fragment@2 {
		target-path = "/";
		__overlay__ {
			// We should switch to mmc-pwrseq-sd8787 after making it
			// compatible with sd8887
			// Currently that module requires two GPIOs to function since it
			// targets a slightly different chip
			power_ctrl: power_ctrl {
				compatible = "gpio-poweroff";
				gpios = <&gpio 40 1>;
				force;
				pinctrl-names = "default";
				pinctrl-0 = <&power_ctrl_pins>;
			};

			i2c_soft: i2c@0 {
				compatible = "i2c-gpio";
				gpios = <&gpio 43 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* sda */
				         &gpio 42 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN) /* scl */>;
				i2c-gpio,delay-us = <5>;
				i2c-gpio,scl-open-drain;
				i2c-gpio,sda-open-drain;
				#address-cells = <1>;
				#size-cells = <0>;
			};

			sd8xxx-wlan {
				drvdbg = <0x6>;
				drv_mode = <0x1>;
				cfg80211_wext = <0xf>;
				sta_name = "wlan";
				wfd_name = "p2p";
				cal_data_cfg = "none";
			};
		};
	};

	fragment@3 {
		target = <&i2c_soft>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			gpio_expander: gpio_expander@20 {
				compatible = "nxp,pca9554";
				gpio-controller;
				#gpio-cells = <2>;
				reg = <0x20>;
				status = "okay";
			};

			// rtc clock
			ds1307: ds1307@68 {
				compatible = "dallas,ds1307";
				reg = <0x68>;
				status = "okay";
			};

			// RGB LEDs (>= v1.1.0)
			pca9633: pca9633@62 {
				compatible = "nxp,pca9633";
				reg = <0x62>;
				#address-cells = <1>;
				#size-cells = <0>;

				red@0 {
					label = "red";
					reg = <0>;
					linux,default-trigger = "none";
				};
				green@1 {
					label = "green";
					reg = <1>;
					linux,default-trigger = "none";
				};
				blue@2 {
					label = "blue";
					reg = <2>;
					linux,default-trigger = "none";
				};
				unused@3 {
					label = "unused";
					reg = <3>;
					linux,default-trigger = "none";
				};
			};
		};
	};
};