linux-kernel - Re: [PATCH 1/3] TTY: add support for "tty slave" devices.

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Date:	Sun, 28 Dec 2014 15:20:10 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neilb@...e.de>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rutland <mark.rutland@....com>,
	Jiri Slaby <jslaby@...e.cz>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] TTY: add support for "tty slave" devices.

Hi!

> index 8c4fd0332028..b59501ee2f21 100644
> --- a/Documentation/devicetree/bindings/serial/of-serial.txt
> +++ b/Documentation/devicetree/bindings/serial/of-serial.txt
> @@ -39,6 +39,10 @@ Optional properties:
>    driver is allowed to detect support for the capability even without this
>    property.
>  
> +Optional child node:
> +- a platform device listed as a child node will be probed and
> +  powered-on whenever the tty is in use (open).
> +
>  Example:
>  
>  	uart@...30000 {

Hmm. Other devices may want it the other way around: probe the device
behind the uart, make it control power and open/close of the uart, and
hide the /dev/ttyXX from userspace...
								Pavel
								
-- 
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