Custom Platform driver don't call probe function. iMX8DXL

Juanma1 — Mon, 21 Mar 2022 17:14:50 GMT

Hello!

I'm working with iMX8DXL, kernel 5.10.72 (BSP).

I wrote a custom platform driver and I can't get the function probe to be called.

I tried to compile within kernel and also as a module and load it using insmod.

In my dts file I added a new node in root node:

...

my_gpio {
compatible = "juanma,my-gpio-ctrl";
};

};

Also I tried to add: status = "okay";

In my_gpio.c I tried to register it from init function with "platform_driver_register" and directly using "module_platform_driver". None of them works.

static int my_gpio_probe(struct platform_device *pdev)
{
pr_info( "%s called!\n",__func__);

return 0;

}

static const struct of_device_id my_gpio_of_ids[] = {
{ .compatible = "juanma,my-gpio-ctrl", 0, },
{}
};
MODULE_DEVICE_TABLE(of, my_gpio_of_ids);

static struct platform_driver my_gpio_ctrl = {
.probe = my_gpio_probe,
.remove = my_gpio_remove,
.driver = {
.name = "my-gpio-ctrl",
.of_match_table = of_match_ptr(my_gpio_of_ids),
.owner = THIS_MODULE,
}
};

module_platform_driver(my_gpio_ctrl);

If I use init function instead of 'module_platform_driver()'

static int __init my_gpio_init(void)
{
pr_info( "%s: init\n", __func__);
platform_driver_register(&my_gpio_ctrl);
pr_info( "%s: driver registered.\n", __func__);
return 0;
}

static void __exit my_gpio_exit(void)
{
platform_driver_unregister(&my_gpio_ctrl);
pr_info( "%s exit\n", __func__);
}

module_init(my_gpio_init);
module_exit(my_gpio_exit);

I got the print of my init function, but probe is not called either.

What am I missing?

Re: Custom Platform driver don't call probe function. iMX8DXL

Juanma1 — Mon, 04 Apr 2022 10:18:53 GMT

Solved!

A badly closed comment '/* .... */' hid the driver node in the root node.

topic Custom Platform driver don't call probe function. iMX8DXL in i.MX Processors

Custom Platform driver don't call probe function. iMX8DXL

Re: Custom Platform driver don't call probe function. iMX8DXL