linux-kernel - Re: [Gta04-owner] [PATCH 0/4] UART slave device support

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Message-ID: <CAKdAkRQh7xSgOXERhA8EjXEfX5m-PTTjiv757X7FYxK=bhfpww@mail.gmail.com>
Date:	Wed, 20 Jan 2016 11:38:44 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Vostrikov Andrey <andrey.vostrikov@...entembedded.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Peter Hurley <peter@...leysoftware.com>,
	"H. Nikolaus Schaller" <hns@...delico.com>,
	Mark Rutland <mark.rutland@....com>,
	List for communicating with real GTA04 owners 
	<gta04-owner@...delico.com>, Tomeu Vizoso <tomeu@...euvizoso.net>,
	NeilBrown <neil@...wn.name>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Marek Belisko <marek@...delico.com>
Subject: Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4

On Fri, Jan 15, 2016 at 11:34 PM, Vostrikov Andrey
<andrey.vostrikov@...entembedded.com> wrote:
>
> Yes, such implementation will help. There is a need for interface like UART BUS that will probe devices without user space.
> Serial I/O for input subsystem defines new type of bus and uses dedicated line discipline, but it still unable to start driver by itself and requires call from 'inputattach' to open port, assign line discipline and go to forever wait on 'read'.

That was done mainly because almost none of the serial protocols could
be auto-probed, so device initialization/setup was moved out of kernel
and thus we have the separate line discipline and inputattach utility.

Thanks.

-- 
Dmitry