Re: Extending serial port linux driver to toggle RS485 direction pin (GPIO)

[Greg KH <gregkh@linuxfoundation.org>]

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http://daringfireball.net/2007/07/on_top

On Tue, Nov 16, 2021 at 07:43:52AM +0100, Jochen Mades wrote:
> Hi Greg, Hi Ivan,
> 
> as would like to extend the RS485 behavior on my raspberry PI I did some "deep-diving" into the amba-pl011 driver and soon recognized the missing hardware support to detect "FIFO empty". Googling around I found the following patch, describing exactly my problem:
> https://lore.kernel.org/linux-arm-kernel/20200107072831.GB1014453@kroah.com/T/
> 
> As I'm not familiar with your processes, I kindly ask you where I can find the patched sources of this Soft-Rs485-Amba driver and if it is planned to be intergrated in a future kernel release?

I do not remember if these patches have been resubmitted or not, check
the current kernel tree for details.

If not, then obviously they need to be fixed up based on the review
comments made.

thanks,

greg k-h