linux-kernel - Re: [PATCH] alter_ps2: Add devicetree support

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Date:	Mon, 17 Jan 2011 13:31:01 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Thomas Chou <thomas@...ron.com.tw>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, nios2-dev@...c.et.ntust.edu.tw,
	linux-input@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Walter Goossens <waltergoossens@...e.nl>
Subject: Re: [PATCH] alter_ps2: Add devicetree support

On Mon, Jan 17, 2011 at 02:29:20PM +0800, Thomas Chou wrote:
> From: Walter Goossens <waltergoossens@...e.nl>
> 

For my education, why is this needed?

> Signed-off-by: Walter Goossens <waltergoossens@...e.nl>
> Signed-off-by: Thomas Chou <thomas@...ron.com.tw>
> ---
>  drivers/input/serio/altera_ps2.c |   16 ++++++++++++++++
>  1 files changed, 16 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/input/serio/altera_ps2.c b/drivers/input/serio/altera_ps2.c
> index 7998560..93054a1 100644
> --- a/drivers/input/serio/altera_ps2.c
> +++ b/drivers/input/serio/altera_ps2.c
> @@ -19,6 +19,9 @@
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
>  #include <linux/slab.h>
> +#ifdef CONFIG_OF
> +#include <linux/of.h>
> +#endif

Does it have to be guarded?

>  
>  #define DRV_NAME "altera_ps2"
>  
> @@ -173,6 +176,16 @@ static int __devexit altera_ps2_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static struct of_device_id altera_ps2_match[] = {

Not const?

> +	{ 
> +		.compatible = "altera,altera_ps2",
> +	},
> +	{},
> +}
> +MODULE_DEVICE_TABLE(of, altera_jtaguart_match);
> +#endif /* CONFIG_OF */
> +
>  /*
>   * Our device driver structure
>   */
> @@ -182,6 +195,9 @@ static struct platform_driver altera_ps2_driver = {
>  	.driver	= {
>  		.name	= DRV_NAME,
>  		.owner	= THIS_MODULE,
> +#ifdef CONFIG_OF
> +		.of_match_table = altera_ps2_match,
> +#endif

Can't we spare 4 bytes per driver and have .of_match_table always
present?

-- 
Dmitry
--
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