nPM1300 does not exit ship hold mode when SHPHLD button pressed or VBUS connected

Question

Hello,

I have custom hardware using an nPM1300 and nRF52840, and I am having trouble getting the nPM1300 to work as described in its documentation. I have a button connected between the SHPHLD pin and ground, and I can tell it is working because I get GPIO events, and a long press does reset the nPM1300. However, if I enable ship hold mode, then it does not exit ship hold mode with either a short press of the button or plugging in USB. I can only get it to exit with a long press.

You can see my hardware at kicanvas.org/?github=https%3A%2F%2Fgithub.com%2Fjoelspadin%2Fmarten_numpad%2Fblob%2Fmain%2Fpcb%2Fnumpad.kicad_pro. The relevant schematics are in usb.kicad_sch and numpad.kicad_sch.

I am using Zephyr 4.1. My devicetree setup for the nPM1300 looks like this:

&i2c0 {
    compatible = "nordic,nrf-twi";
    status = "okay";

    pinctrl-0 = <&i2c0_default>;
    pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";

    npm1300_pmic: pmic@6b {
        compatible = "nordic,npm1300";
        status = "okay";
        reg = <0x6b>;

        host-int-gpios = <&gpio0 30 0>;
        pmic-int-pin = <1>;
        long-press-reset = "one-button";

        npm1300_regulators: regulators {
            compatible = "nordic,npm1300-regulator";

            main_regulator: BUCK2 {
                regulator-min-microvolt = <3300000>;
                regulator-max-microvolt = <3300000>;
                regulator-always-on;
            };
        };

        npm1300_charger: charger {
            compatible = "nordic,npm1300-charger";
            charging-enable;

            term-microvolt = <4150000>;
            term-warm-microvolt = <4000000>;
            current-microamp = <250000>;
            dischg-limit-microamp = <1000000>;
            vbus-limit-microamp = <500000>;

            // No thermistor
            thermistor-ohms = <0>;
            thermistor-beta = <3380>;
        };

        npm1300_leds: leds {
            compatible = "nordic,npm1300-led";
            nordic,led0-mode = "charging";
            nordic,led1-mode = "host";
            nordic,led2-mode = "host";
        };
    };
};

Using

    static struct gpio_callback event_cb;
    gpio_init_callback(&event_cb, power_button_callback, BIT(NPM1300_EVENT_SHIPHOLD_PRESS));
    mfd_npm1300_add_callback(pmic, &event_cb);

I have set up a callback which checks if USB is powered. If not, it blinks an LED a few times, then calls regulator_parent_ship_mode(). With the board powered only from a battery, when I press the button, the LED blinks, then it shuts off and the voltage to the SoC drops to 0 as expected. When I press the button again, nothing happens. (I can tell it is not waking, immediately triggering the GPIO event, and then going back into ship mode, because the LED does not blink.) Similarly, reconnecting USB power does not wake it either.

Is there something else I'm missing that needs to be configured?

joelspadin · Accepted Answer

I think I have actually figured it out this time. 
 regulator_parent_ship_mode() does not take a regulator device, look up its parent, and call ship mode on the parent. regulator_parent_ship_mode() wants a regulator's parent device to be passed to it. 
 I expect that calling regulator_parent_ship_mode() on the BUCK2 device did something that actually sent a command to the PMIC, but which it disliked enough to disable BUCK2 and get stuck in a bad state which looked a lot like ship mode, and where only a hard reset could recover it. 
 Calling regulator_parent_ship_mode() on the nordic,npm1300-regulator device works as expected. Hibernate mode was working before because that uses mfd_npm1300_hibernate(), which is called on the nordic,npm1300 device.

Voltage	Ship mode	Ship mode	Normal mode	Normal mode
	USB connected	USB disconnected	USB connected	USB disconnected
VBUS	4.9 V	0 V	4.9 V	0 V
VBAT	4.13 V	4.0 V	4.13 V	4.0 V
SHPHLD (at switch)	4.9 V	-30 mV	4.9 V	4.0 V
BUCK2 output	2 mV	9 mV	3.2 V	3.2 V
Charge LED	Off	Off	On	Off

nPM1300 does not exit ship hold mode when SHPHLD button pressed or VBUS connected

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