RE: Questions about usb to serial driver

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> -----Original Message-----
> From: gregkh@xxxxxxxxxxxxxxxxxxx <gregkh@xxxxxxxxxxxxxxxxxxx>
> Sent: Friday, July 1, 2022 3:16 PM
> To: Neal Liu <neal_liu@xxxxxxxxxxxxxx>
> Cc: linux-usb@xxxxxxxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx
> Subject: Re: Questions about usb to serial driver
> 
> On Fri, Jul 01, 2022 at 03:16:13AM +0000, Neal Liu wrote:
> > Hi all,
> >
> > I have a question about USB-serial and I hope I can find the answer from
> here.
> > I'll be appreciated it if there is any feedback from you.
> >
> > My question is If I have a USB device controller (udc) and a uart
> > controller (16550) independently in a SoC, is there any usb-serial drivers or
> applications that could possible to support/connect:
> > -	udc tx to uart rx
> > -	uart tx to udc rx
> >
> > Any chance I can make this SoC as a usb-serial devices?
> 
> Sure, use the CONFIG_USB_CONFIGFS_SERIAL or CONFIG_USB_CONFIGFS_ACM
> build options and hook your gadget up to the serial port in userspace and you
> will have a very expensive usb-serial converter (there are very cheap chips that
> do the same thing if you want to make a simpler
> device.)
> 
> hope this helps,

Thanks Greg!

What the detail steps exactly for "hook your gadget up to the serial port in userspace"?
Assume my system has:
1 system uart: ttyS0
1 uart: ttyS1
1 usb gadget cdc acm: ttyGS0

How to hook up ttyS1 to ttyGS0, so that I could communicate through below path.
PC1 - usb interface - my SoC (ttyGS0 - ttyS1) - rs232 interface - PC2?

-Neal




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