serdev_device_driver probe not called

[SAman.1]

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 = <10000000u>;

};

};

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 side https://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) modules

clean:

rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

.PHONY: modules clean

else

obj-$(ST32_UART) += usartNet.o

obj-m := usartNet.o

endif

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

And in the arch/arm64/configs/defconfig

i added

CONFIG_SERIAL_DEV_CTRL_TTYPORT=y