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

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Message-ID: <20141211224104.GA11666@earth.universe>
Date:	Thu, 11 Dec 2014 23:41:04 +0100
From:	Sebastian Reichel <sre@...nel.org>
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,

On Fri, Dec 12, 2014 at 08:59:44AM +1100, NeilBrown wrote:
> A "tty slave" is a device connected via UART.
> It may need a driver to, for example, power the device on
> when the tty is opened, and power it off when the tty
> is released.
> 
> A "tty slave" is a platform device which is declared as a
> child of the uart in device-tree:
> 
> &uart1 {
> 	bluetooth {
> 		compatible = "tty,regulator";
> 		vdd-supply = <&vaux4>;
> 	};
> };
> 
> runtime power management is used to power-up the device
> on tty_open() and  power-down on tty_release().
> 
> Signed-off-by: NeilBrown <neilb@...e.de>

FWIW:

Acked-By: Sebastian Reichel <sre@...nel.org>

-- Sebastian

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