monarco-hat-4-9.dts

/dts-v1/;
/plugin/;

/*
 * Device Tree Overlay for the Monarco HAT version 4-9
 *
 * This overlay is flashed (units shipped since 2017/10) in the onboard EEPROM
 * according to the HAT specification.
 *
 * Designed for Raspbian with Linux kernel 4.9 (changed serial* aliases paths).
 *
 * WARNING: Not compatible with Linux kernel 4.4 previously shipped with Raspbian,
 * UART swapping and aliases are broken.
 *
 * Author: Vlastimil Setka
 * REX Controls s.r.o.
 * https://www.monarco.io
 * https://github.com/monarco/
 * https://www.rexcontrols.com
 */

/ {
    compatible = "brcm,bcm2708";

    /* Enable SPI for Monarco HAT */

    fragment@1 {
        target = <&spi0>;
        __overlay__ {
            status = "okay";
        };
    };

    /* Enable I2C for Monarco HAT */

    fragment@2 {
        target = <&i2c_arm>;
        __overlay__ {
            #address-cells = <1>;
            #size-cells = <0>;
            status = "okay";
            mcp7941x@6f {
                compatible = "microchip,mcp7941x";
                reg = <0x6f>;
            };
            ds2482@18 {
                compatible = "maxim,ds2482";
                reg = <0x18>;
            };
        };
    };

    /* RPi3: switch uart0 (alias serial0) back to HAT pins, uart1 (alias serial1) for Bluetooth */

    /* We can not reference &uart0_pins and &uart1_pins directly
       as they are are not defined in dt before RPi 3, so we define them in &gpio */

    fragment@3 {
        target = <&gpio>;
        __overlay__ {
            uart0_pins: uart0_pins {
                brcm,pins;
                brcm,function;
                brcm,pull;
            };
            uart1_pins: uart1_pins {
                brcm,pins = <32 33>;
                brcm,function = <2>;
                brcm,pull = <0 2>;
            };
        };
    };

    fragment@4 {
        target = <&uart0>;
        __overlay__ {
            pinctrl-names = "default";
            pinctrl-0 = <&uart0_pins>;
            status = "okay";
        };
    };

    fragment@5 {
        target = <&uart1>;
        __overlay__ {
            pinctrl-names = "default";
            pinctrl-0 = <&uart1_pins>;
            status = "okay";
        };
    };

    fragment@6 {
        target-path = "/aliases";
        __overlay__ {
            serial0 = "/soc/serial@7e201000";
            serial1 = "/soc/serial@7e215040";
        };
    };

};