How to use the nrfx_spim on Zephyr 3.1

[caco3]

On Zephyr 2.7 I have following code to setup a SPIM on a custom board:
Device tree:

/ {
    compatible = "nordic,nrf52840-dongle-nrf52840";

    /* External ADC GPIO Pins:
     *   N_RESET_ADC: P1.09 (GPIO 33)
     *   N_DRDY_ADC : P0.24 (GPIO 5)
     *   N_CS_ADC   : P0.16 (GPIO_4)
     */
    external-adc {
        compatible = "gpio-leds"; /* why gpio-leds? */
        n_cs_adc: n_cs_adc_0 {
            gpios = <&gpio0 16 (GPIO_ACTIVE_LOW)>;
            label = "N_CS_ADC";
        };
    };
};

/* SPI Interface to ADC
 * nCS_ADC:  P0.16 GPIO_4
 * SCLK_ADC: P0.13 GPIO_1
 * DIN_ADC:  P0.14 GPIO_2
 * DOUT_ADC: P0.15 GPIO_3
 */
&spi3 {
    compatible= "nordic,nrf-spim";
    status = "okay";
    sck-pin = <13>;
    miso-pin = <15>;
    mosi-pin = <14>;
};

main.c:

/* Pin Mapping from Devicetree */
#define ADC_nSS       DT_GPIO_PIN(DT_NODELABEL(n_cs_adc), gpios)
#define ADC_SCK       NRF_GPIO_PIN_MAP(0,13) // TODO: Find a way to get pin numbers from devicetree
#define ADC_MISO      NRF_GPIO_PIN_MAP(0,15) // TODO: Find a way to get pin numbers from devicetree
#define ADC_MOSI      NRF_GPIO_PIN_MAP(0,14) // TODO: Find a way to get pin numbers from devicetree
#define ADC_nDRDY     DT_GPIO_PIN(DT_NODELABEL(n_drdy_adc), gpios)

    /* Device Handle for SPIM3 */
    static const nrfx_spim_t spi3 = NRFX_SPIM_INSTANCE(3);

    nrfx_spim_config_t spi_config;

    /* Set SPI3 properties */
    /* TODO: Find a way to use the DTS definitions for the Pin numbers */
    spi_config.ss_pin = ADC_nSS;
    spi_config.miso_pin = ADC_MISO;
    spi_config.mosi_pin = ADC_MOSI;
    spi_config.sck_pin = ADC_SCK;
 // [..]

    /* Initialize SPI Peripheral */
    if(nrfx_spim_init(&spi3, &spi_config, ads131_eventHandler, NULL)

  // [..]

Now this no longer works on Zephyr 3.1.
I temporarily tried it with CONFIG_PINCTRL=n but simply do not see any data on the bus.

The correct way would be to port it to use the new pinctrl, but I can not find an example how to do this :(

[caco3]

See discussion in https://devzone.nordicsemi.com/f/nordic-q-a/89272/how-to-use-the-nrfx_spim-on-zephyr-3-1