serdev_device_driver probe not called

Hello on my kernel module my probe funtion gets not called.

static const struct of_device_id stm32_match[] = {    { .compatible = "st,stm32-uart", .data = &stm32f4_info},    { .compatible = "st,stm32f7-uart", .data = &stm32f7_info},    { .compatible = "st,stm32h7-uart", .data = &stm32h7_info},    { .compatible = "st,stm32_usart_net",},    {},};static int stm_uart_probe(struct serdev_device *serdev){    printk("<1>Hello world 1.\n");}static void stm_uart_remove(struct serdev_device *serdev){     printk("<2>Bye world 2.\n");}static struct serdev_device_driver qca_uart_driver = {    .probe = stm_uart_probe,    .remove = stm_uart_remove,    .driver = {        .name = QCAUART_DRV_NAME,        .of_match_table = of_match_ptr(stm32_match),    },};module_serdev_device_driver(qca_uart_driver);

in my kernel log i can not find my my log. I presentation for the bluetooth example so i changed my device tree like this:

&usart3 {    compatible = "st,stm32-uart", "st,stm32f7-uart", "st,stm32h7-uart";    pinctrl-names = "default", "sleep", "idle";    pinctrl-0 = <&usart3_pins_b>;    pinctrl-1 = <&usart3_sleep_pins_b>;    pinctrl-2 = <&usart3_idle_pins_b>;    uart-has-rtscts;    status = "okay";    ethernet {        compatible = "st,stm32_usart_net";        local-mac-address = [ AB AB AB AB AB AB ];        current-speed = <10000000>;    };};

The orriginal configuration with let the usart show up as character device looked like this:

&usart3 {    pinctrl-names = "default", "sleep", "idle";    pinctrl-0 = <&usart3_pins_b>;    pinctrl-1 = <&usart3_sleep_pins_b>;    pinctrl-2 = <&usart3_idle_pins_b>;    uart-has-rtscts;    status = "okay";};

Now my device will not be loaded as Character device and on the directories it shows up like this:/sys/devices/platform/soc/4000f000.serial

• serial0 -> serial0.0

But thers no HCI Device.I orientated myself on this sidehttps://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/net/qca,qca7000.txt

I also kreated a Kconfig

config ST32_UART    tristate "STM32 UART support"    select usartNet    depends on SERIAL_DEV_BUS && OF    help      This UART protocol driver supports the STM32 Usart.      Currently the driver assumes these device UART settings:        Data bits: 8        Parity: None        Stop bits: 1        Flow control: None      To compile this driver as a module, choose M here. The module      will be called qcauart.

My Makefile

ifeq ($(KERNELRELEASE),)    KERNELDIR ?= /opt/st/stm32mp1/3.1-openstlinux-5.4-dunfell-mp1-20-11-12/stm32mp1-openstlinux-5-4-dunfell-mp1-20-11-12/sources/arm-ostl-linux-gnueabi/linux-stm32mp-5.4.56-r0/build    PWD := $(shell pwd)modules:    $(MAKE) -C $(KERNELDIR) M=$(PWD) modulesclean:    rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions.PHONY: modules cleanelse    obj-$(ST32_UART) += usartNet.o    obj-m := usartNet.oendif

i build the module just by calling make. Then i insert it with insmod. But i do not get any logs.

As a solution I needed to enable some points in the Kconfig:

Device drivers --->    Character devices ---><*> Serial Device bus ---><*> Serial Device TTY port controller --->