linux-kernel - Re: [PATCH 13/15] x86/rtc: don't register rtc if we have an OF node for it

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Date:	Thu, 30 Dec 2010 01:59:40 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, sodaville@...utronix.de,
	x86@...nel.org, dirk.brandewie@...il.com
Subject: Re: [PATCH 13/15] x86/rtc: don't register rtc if we have an OF
 node for it

On Fri, Dec 17, 2010 at 04:33:51PM +0100, Sebastian Andrzej Siewior wrote:
> or we end up with two of those things.

More generically, rather than searching for an rtc node, I imagine
simply the presence of a device tree blob means that the rtc
registration should be suppressed.

g.

> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  arch/x86/kernel/rtc.c |   23 +++++++++++++++++++++++
>  1 files changed, 23 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
> index 1cfbbfc..382c6cb 100644
> --- a/arch/x86/kernel/rtc.c
> +++ b/arch/x86/kernel/rtc.c
> @@ -6,6 +6,7 @@
>  #include <linux/acpi.h>
>  #include <linux/bcd.h>
>  #include <linux/pnp.h>
> +#include <linux/of.h>
>  
>  #include <asm/vsyscall.h>
>  #include <asm/x86_init.h>
> @@ -218,6 +219,25 @@ static struct platform_device rtc_device = {
>  	.num_resources	= ARRAY_SIZE(rtc_resources),
>  };
>  
> +#ifdef CONFIG_OF
> +static __init int have_rtc_of_node(void)
> +{
> +	struct device_node *n;
> +
> +	n = of_find_compatible_node(NULL, NULL, "motorola,mc146818");
> +	if (n) {
> +		of_node_put(n);
> +		return 1;
> +	}
> +	return 0;
> +}
> +#else
> +static inline int have_rtc_of_node(void)
> +{
> +	return 0;
> +}
> +#endif
> +
>  static __init int add_rtc_cmos(void)
>  {
>  #ifdef CONFIG_PNP
> @@ -237,6 +257,9 @@ static __init int add_rtc_cmos(void)
>  	}
>  #endif
>  
> +	if (have_rtc_of_node())
> +		return 0;
> +
>  	platform_device_register(&rtc_device);
>  	dev_info(&rtc_device.dev,
>  		 "registered platform RTC device (no PNP device found)\n");
> -- 
> 1.7.3.2
> 
> --
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