SPIS with nRF54L15 with the current Development Kit

Question

Hello !
I'm trying to adapt the code from the master-slave SPI example (https://github.com/too1/ncs-spi-master-slave-example) for my nRF54L15 development kit.

The master part runs smoothly, but when it comes to the slave, I get a linking error on build (undefined reference to `__device_dts_ord_72' ).

When I look in build/zephyr/include/generated.devicetree_generated.h, I have Node 72 = /soc/peripheral@50000000/spi@c8000

When I look in build/zephyr/zephyr.dts, I have :

			spi22: spi_slave: spi@c8000 {
				compatible = "nordic,nrf-spis";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0xc8000 0x1000 >;
				interrupts = < 0xc8 0x1 >;
				max-frequency = < 0x7a1200 >;
				easydma-maxcnt-bits = < 0x10 >;
				status = "okay";
				pinctrl-0 = < &spi_slave_default >;
				pinctrl-1 = < &spi_slave_sleep >;
				pinctrl-names = "default", "sleep";
				cs-gpios = < &gpio1 0x0 0x1 >;
				def-char = < 0x0 >;
			};

My .overlay file look like this :

//Disable everything that could collide, test only
&spi20 {
    status = "disabled";
};

&spi21 {
    status = "disabled";
};

&spi30 {
    status = "disabled";
};

&i2c20 {
    status = "disabled";
};

&i2c21 {
    status = "disabled";
};

&i2c22 {
    status = "disabled";
};

&i2c30 {
    status = "disabled";
};

&uart30 {
    status = "disabled";
};

&uart22 {
    status = "disabled";
};

&spi22{
    status = "okay";
};


&pinctrl {
    spi_slave_default: spi_slave_default {
        group1 {
            psels = <NRF_PSEL(SPIS_MOSI, 1, 2)>,
                    <NRF_PSEL(SPIS_SCK, 1, 1)>,
                    <NRF_PSEL(SPIS_MISO, 1, 3)>;
        };
    };

    spi_slave_sleep: spi_slave_sleep {
        group1 {
            psels = <NRF_PSEL(SPIS_MOSI, 1, 2)>,
                    <NRF_PSEL(SPIS_SCK, 1, 1)>,
                    <NRF_PSEL(SPIS_MISO, 1, 3)>;
            low-power-enable;
        };
    };
};

spi_slave: &spi22 {
	compatible = "nordic,nrf-spis";
    status = "okay";
	max-frequency = <DT_FREQ_M(8)>;
    pinctrl-0 = <&spi_slave_default>;
    pinctrl-1 = <&spi_slave_sleep>;
    pinctrl-names = "default", "sleep";
	cs-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
	def-char = <0>;
};

In my .conf file, I have enabled CONFIG_SPI and CONFIG_SPI_SLAVE.

the simplified main.c looks like this :

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/spi.h>

#include <zephyr/logging/log.h>

#define SPI_SLAVE DT_NODELABEL(spi_slave)
const struct device *my_spi_slave;

static void spi_slave_init(void)
{
	my_spi_slave = DEVICE_DT_GET(SPI_SLAVE);
	if(!device_is_ready(my_spi_slave)){
		LOG_ERR("SPI master device not ready!");
	}
}

...

int main(void){
spi_slave_init();
}

Whenever I call spi_slave_init(), I have the error on build.
I tried using :

#if !DT_NODE_EXISTS(DT_NODELABEL(spi_slave))
#error "Invalid Node Identifier !"
#endif

But it builds correctly (without the spi_slave_init() line).

I also tried to build the same main.c with a nRF52 config by adapting the .overlay file, and it runs smoothly.

If anyone has a clue, I would appreciate this !
Have a good day,
Hugo