linux-kernel - Re: [PATCH] serial: i.MX: evaluate linux,stdout-path property

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Message-ID: <20121004131242.GI1322@pengutronix.de>
Date:	Thu, 4 Oct 2012 15:12:42 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH] serial: i.MX: evaluate linux,stdout-path property

On Thu, Oct 04, 2012 at 07:44:45AM -0500, Rob Herring wrote:
> On 10/04/2012 05:39 AM, Sascha Hauer wrote:
> > devicetrees may have the linux,stdout-path property to specify the
> > console. This patch adds support to the i.MX serial driver for this.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> > ---
> > 
> > I was originally looking for a more generic way to handle this, but
> > since a struct console has no device associated to it, it's not
> > possible to match a console with a device in a generic way. So we
> 
> Could we add a device ptr to struct console?

I think not. Looking at some drivers they register a console very early
when there is no device available (even if there will be a device later
when the uart driver probes)

> >  #ifdef CONFIG_OF
> >  /*
> > + * Check if this device matches the linux,stdout-path property
> > + * in the chosen node. return true if yes, false otherwise
> > + */
> > +static int serial_imx_is_stdoutpath(struct platform_device *pdev)
> 
> Couldn't this function be generic? Just move
> IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE) outside this function. Arguably,
> the presence of the property or not could replace the config option all
> together.
> 
> And use a struct device so this can work with devices other than
> platform devices (i.e. amba).

Ok, makes sense.

Sascha

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