linux-kernel - Re: [PATCH 3/3] watchdog: omap

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Date:	Tue, 29 May 2012 13:06:00 -0500
From:	Jon Hunter <jon-hunter@...com>
To:	<jgq516@...il.com>
CC:	<linux@....linux.org.uk>, <b-cousson@...com>,
	<rob.herring@...xeda.com>, <grant.likely@...retlab.ca>,
	<rnayak@...com>, <tony@...mide.com>, <wim@...ana.be>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH 3/3] watchdog: omap_wdt: add device tree support


On 05/25/2012 05:42 AM, jgq516@...il.com wrote:
> From: Xiao Jiang <jgq516@...il.com>
> 
> Add device table for omap_wdt to support dt.
> 
> Signed-off-by: Xiao Jiang <jgq516@...il.com>
> ---
>  drivers/watchdog/omap_wdt.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
> index 8285d65..d98c615 100644
> --- a/drivers/watchdog/omap_wdt.c
> +++ b/drivers/watchdog/omap_wdt.c
> @@ -430,6 +430,13 @@ static int omap_wdt_resume(struct platform_device *pdev)
>  #define	omap_wdt_resume		NULL
>  #endif
>  
> +static const struct of_device_id omap_wdt_of_match[] = {
> +	{ .compatible = "ti,omap3-wdt", },
> +	{ .compatible = "ti,omap4-wdt", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, omap_wdt_of_match);
> +
>  static struct platform_driver omap_wdt_driver = {
>  	.probe		= omap_wdt_probe,
>  	.remove		= __devexit_p(omap_wdt_remove),
> @@ -439,6 +446,7 @@ static struct platform_driver omap_wdt_driver = {
>  	.driver		= {
>  		.owner	= THIS_MODULE,
>  		.name	= "omap_wdt",
> +		.of_match_table = omap_wdt_of_match,
>  	},
>  };
>  

I think we need to add some code to the probe function that calls
of_match_device() and ensures we find a match. For example ...

	if (of_have_populated_dt())
		if (!of_match_device(omap_wdt_of_match, &pdev->dev))
			return -EINVAL;

Cheers
Jon
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