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

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Message-ID: <20141213174640.GA18961@earth.universe>
Date:	Sat, 13 Dec 2014 18:46:41 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	NeilBrown <neilb@...e.de>,
	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 11:59:20AM +0000, Grant Likely wrote:
> [...]
> > --- 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).
> > +
> 
> The biggest concern I have is what happens to nodes that already have
> child devices that /don't/ match this use case? It is possible that some
> UART nodes already have a child node used to store other data. There are
> two ways to handle this; 1) add a new bool property that indicates the
> child nodes are tty slave devices, or 2) Make each uart driver
> explicitly enable the feature so that driver authors can check if it is
> a problem for that device. I personally would suggest #1 because then it
> can be enabled in generic code.

maybe simple depend on the compatible value? If the UART node has
child nodes to store other random data it should not have a
compatible value?

-- Sebastian

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