BB-I2C2-PCF8523-00A0.dts (syntax clean-up)

/*
 * Copyright (C) 2017 Robert Nelson <robertcnelson@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/board/am335x-bbw-bbb-base.h>
#include <dt-bindings/pinctrl/am33xx.h>
#include <dt-bindings/gpio/gpio.h>

// Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
&{/chosen} {
    overlays {
        BB-I2C2-PCF8523-00A0 = __TIMESTAMP__;
    };
};

// Free up the pins used by the cape from the pinmux helpers.
&ocp {
    P9_19_pinmux { status = "disabled"; };  // i2c2_scl
    P9_20_pinmux { status = "disabled"; };  // i2c2_sda
};

&{/aliases} {
    rtc0 = &extrtc;   // <--- FIXME this cannot work in overlays!
    rtc1 = "/ocp/rtc@44e3e000";
};

&am33xx_pinmux {
    bb_i2c2_pins: pinmux_bb_i2c2_pins {
        pinctrl-single,pins = <
            BONE_P9_20 0x73 // i2c2_sda, SLEWCTRL_SLOW | INPUT_PULLUP | MODE3
            BONE_P9_19 0x73 // i2c2_scl, SLEWCTRL_SLOW | INPUT_PULLUP | MODE3
        >;
    };
};

&i2c2 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&bb_i2c2_pins>;

    // this is the configuration part
    clock-frequency = <100000>;

    #address-cells = <1>;
    #size-cells = <0>;

    extrtc: pcf8523@68 {
        compatible = "nxp,pcf8523";
        reg = <0x68>;
    };
};