linux-kernel - Re: [PATCH 3/4] tty: serial: altera

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Message-ID: <20110216120714.GA24203@angua.secretlab.ca>
Date:	Wed, 16 Feb 2011 05:07:14 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Tobias Klauser <tklauser@...tanz.ch>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-serial@...r.kernel.org,
	nios2-dev@...c.et.ntust.edu.tw,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] tty: serial: altera_uart: Add devicetree support

On Wed, Feb 16, 2011 at 08:43:21AM +0100, Tobias Klauser wrote:
> On 2011-02-16 at 05:32:01 +0100, Grant Likely <grant.likely@...retlab.ca> wrote:
> > On Wed, Feb 09, 2011 at 10:58:13AM +0100, Tobias Klauser wrote:
> > > With the recent switch of the (currently still out-of-tree) Nios2 Linux
> > > port to devicetree we want to be able to retreive the resources and
> > > properties from dts.
> > > 
> > > The old method to retreive resources and properties from platform data
> > > is still supported.
> > > 
> > > Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
> > > ---
[...]
> > > +static struct of_device_id altera_uart_match[] = {
> > > +	{ .compatible = "altr,uart-1.0", },
> > > +	{},
> > > +};
> > > +MODULE_DEVICE_TABLE(of, altera_uart_match);
> > 
> > Need to protect the MODULE_DEVICE_TABLE with #ifdef/#endif.  You don't
> > want to advertise device tree support when CONFIG_OF isn't selected.
> 
> Shall I put the #ifdef around the whole table and define it as NULL if
> CONFIG_OF is not defined - like this:
> 
> 	#ifdef CONFIG_OF
> 	static struct of_device_id altera_uart_match[] = {
> 		{ .compatible = "altr,uart-1.0", },
> 		{},
> 	};
> 	MODULE_DEVICE_TABLE(of, altera_uart_match);
> 	#else
> 	#define altera_uart_match NULL
> 	#endif /* CONFIG_OF */
> 
> or will it be sufficient to just #ifdef the MODULE_DEVICE_TABLE:
> 
> 	static struct of_device_id altera_uart_match[] = {
> 		{ .compatible = "altr,uart-1.0", },
> 		{},
> 	};
> 	#ifdef CONFIG_OF
> 	MODULE_DEVICE_TABLE(of, altera_uart_match);
> 	#endif

Either is fine, but the first will have a smaller memory footprint
when CONFIG_OF is deselected.

g.

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