linux-kernel - Re: [PATCH] usb: core: support interface node for simple USB devices

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Message-ID: <fb9225a0-0684-42d1-923e-61212ac3d3c9@leica-geosystems.com>
Date: Thu, 23 Jan 2025 11:52:03 +0000
From: POPESCU Catalin <catalin.popescu@...ca-geosystems.com>
To: Johan Hovold <johan@...nel.org>
CC: Greg KH <gregkh@...uxfoundation.org>, "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "m.felsch@...gutronix.de"
	<m.felsch@...gutronix.de>, GEO-CHHER-bsp-development
	<bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH] usb: core: support interface node for simple USB devices

On 23/01/2025 12:18, Johan Hovold wrote:
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> On Wed, Jan 22, 2025 at 05:17:36PM +0000, POPESCU Catalin wrote:
>> On 22/01/2025 14:53, Greg KH wrote:
>>> serdev can not use usb-serial devices due to the lack of hotplugging, so
>>> why is this an issue?  I thought that just would not work.
>> Well, I can say that on 6.12.0 it's working :
>>
>> [    0.929493] usb 1-1: new full-speed USB device number 2 using xhci-hcd
>> [    5.906574] usbcore: registered new interface driver ftdi_sio
>> [    5.906632] usbserial: USB Serial support registered for FTDI USB
>> Serial Device
>> [    5.906727] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
>> [    5.906842] usb 1-1: Detected FT-X
>> [    5.907809] serial serial0: tty port ttyUSB0 registered
> You'd need to patch USB serial too for this to happen so this in not
> mainline 6.12.
>
> And if the port is open during disconnect you'd see a bunch of warnings
> because the serdev tty port implementation does not handle hangups.
>
> Johan

My bad, I got a reminder that we're using a set of patches that add 
support for the missing pieces :
https://lore.kernel.org/all/20240807-v6-10-topic-usb-serial-serdev-v1-0-ed2cc5da591f@pengutronix.de/

Sorry for the confusion.

BR,
Catalin