Re: [PATCH 0/3] tty slave device support - version 3.

Pavel Machek
2015-03-20T19:31:24Z

Hi!

> here is version 3 of support for tty-slaves.
>
> This version introduces a new bus-type for tty-slaves, and causes
> a tty-slave device to appear in /sys/devices between the uart and the
> tty.
> It effectively intercepts and calls from the tty to the uart (i.e. any
> tty_operations) and applies extra functionality at that point.
>
> Currently the only driver intercepts open and close.
> It powers on the device on open, and powers off at last-close.
>
> Power can be controlled by a regulator or by toggling a GPIO.
>
> I think I've incorporated most of the feed back I received from
> previous versions, but if I missed something - I apologize. If
> this approach is structurally acceptable then I can fix up all the
> smaller issues.

Do you have dts example? Anyway, we'll need something similar for
bluetooth on N900. But we'd like the /dev/ttyXX not to be visible to
the userspace in that case.

Thanks,
Pavel

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