linux-kernel - Re: [RFC/PATCHv2 1/2] clk: of: helper for filling parent clock array and return num of parents

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Message-ID: <20150604212447.GP676@codeaurora.org>
Date:	Thu, 4 Jun 2015 14:24:47 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	dinguyen@...nsource.altera.com
Cc:	mturquette@...aro.org, dinh.linux@...il.com, geert@...ux-m68k.org,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCHv2 1/2] clk: of: helper for filling parent clock array
 and return num of parents

On 06/04, dinguyen@...nsource.altera.com wrote:
> From: Dinh Nguyen <dinguyen@...nsource.altera.com>
> 
> Sprinkled all through the platform clock drivers are code like this to
> fill the clock parent array:
> 
> for (i = 0; i < num_parents; ++i)
> 	parent_names[i] = of_clk_get_parent_name(np, i);
> 
> The of_clk_parent_fill() will do the same as the code above, and while
> at it, return the number of parents as well since the logic of the
> function is to the walk the clock node to look for the parent.
> 
> Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> ---
> v2: use unsigned int for size
> ---
>  drivers/clk/clk.c            | 20 ++++++++++++++++++++
>  include/linux/clk-provider.h |  1 +
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 459ce9d..778bebd 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -3060,6 +3060,26 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
>  }
>  EXPORT_SYMBOL_GPL(of_clk_get_parent_name);
>  
> +/*

Need a double ** here for kernel doc.

> + * of_clk_parent_fill(): Helper clock function that will fill the parent
> + * clock's array and return the number of parents it found.

Please try to shorten this sentence.

	Fill @parents with names of @np's parents and return number of parents

> + * @np: Device node pointer associated with clock provider
> + * @parents: pointer to char array that hold the parent's name

s/parent's name/parents' names/ ?

> + * @size: size of the parents array
> + *
> + * Returns number of parents for the clock node.
> + */
> +int of_clk_parent_fill(struct device_node *np, const char **parents, unsigned int size)
> +{
> +	unsigned int i = 0;
> +
> +	while (i < size && (parents[i] = of_clk_get_parent_name(np, i)) != NULL)
> +		i++;
> +
> +	return i;
> +}
> +EXPORT_SYMBOL(of_clk_parent_fill);

Can this be GPL?

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