linux-kernel - Re: [PATCH] clksrc-of: warn if no clock sources are found

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Date:	Wed, 20 Nov 2013 10:09:43 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCH] clksrc-of: warn if no clock sources are found

On 11/20/2013 09:58 AM, Linus Walleij wrote:
> Many platforms rely on clocksource_of_init() being implicitly
> called for registering clock sources and will get zero warnings
> if no working clock source is available. Let's print a critical
> error message if no clock source is found.
>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

+1.

Added Stephen Warren in Cc.

> ---
>   drivers/clocksource/clksrc-of.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c
> index 35639cf4e5a2..a30b42c3ac3b 100644
> --- a/drivers/clocksource/clksrc-of.c
> +++ b/drivers/clocksource/clksrc-of.c
> @@ -28,6 +28,7 @@ void __init clocksource_of_init(void)
>   	struct device_node *np;
>   	const struct of_device_id *match;
>   	clocksource_of_init_fn init_func;
> +	unsigned clocksources = 0;
>
>   	for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
>   		if (!of_device_is_available(np))
> @@ -36,5 +37,8 @@ void __init clocksource_of_init(void)
>   		init_func = match->data;
>   		init_func(np);
>   		of_node_put(np);
> +		clocksources++;
>   	}
> +	if (!clocksources)
> +		pr_crit("%s: no matching clocksources found\n", __func__);
>   }
>


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