Re: [PATCH v2 15/24] net: qualcomm: MODULE_DEVICE_TABLE(serdev)

[Ricardo Ribalda Delgado]

Hi Marcel,
On Mon, Jun 11, 2018 at 3:01 PM Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
>
>
> the commit message is misleading me. If I build something with ACPI or DT support, then modinfo will show all modalias information for ACPI and DT compatible strings. What else does udev/modprobe actually need? Is something broken with the modalias export?

The main purpose is to autoload drivers for devices that have been
created via sysfs or another module.

Eg1: We have a serial port on a standard computer that has connected a
GPS module. Since it is something that is not in the ACPI nor the DT
table the user will run

echo serdev_gps > /sys/bus/serial/devices/serial0/new_device

Eg2 module: https://github.com/ribalda/linux/blob/415bb3f0076c2b846ebe5409589b8e1e3004f55a/drivers/tty/serdev/test_platform.c

Modprobe does not know what module to load for that device unless
there is a matching MODULE_DEVICE_TABLE
Today, we have the same functionality for i2c devices
https://www.kernel.org/doc/Documentation/i2c/instantiating-devices

I guess the commit message is really bad :), sorry about that. Any
suggestions to improve it?

Thanks!

>
> Regards
>
> Marcel
>


-- 
Ricardo Ribalda