linux-kernel - Re: [PATCH v2 1/3] clk: abstract parent cache

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Date:	Mon, 13 May 2013 13:01:23 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	James Hogan <james.hogan@...tec.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH v2 1/3] clk: abstract parent cache

Quoting James Hogan (2013-04-19 09:28:22)
> Abstract access to the clock parent cache by defining
> __clk_get_parent_by_index(clk, index). This allows access to parent
> clocks from clock drivers.
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> ---
>  drivers/clk/clk.c            | 21 ++++++++++++++-------
>  include/linux/clk-provider.h |  1 +
>  2 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index ed87b24..79d5deb 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -415,6 +415,19 @@ struct clk *__clk_get_parent(struct clk *clk)
>         return !clk ? NULL : clk->parent;
>  }
>  
> +struct clk *__clk_get_parent_by_index(struct clk *clk, u8 index)

This looks good, but in the next version can you remove the double
underscore?  I'm getting rid of a lot of those double underscore
helpers now that the reentrancy patch is merged and I think this is a
reasonable top-level API for a clock provider to have.

Thanks,
Mike

> +{
> +       if (!clk || index >= clk->num_parents)
> +               return NULL;
> +       else if (!clk->parents)
> +               return __clk_lookup(clk->parent_names[index]);
> +       else if (!clk->parents[index])
> +               return clk->parents[index] =
> +                       __clk_lookup(clk->parent_names[index]);
> +       else
> +               return clk->parents[index];
> +}
> +
>  unsigned int __clk_get_enable_count(struct clk *clk)
>  {
>         return !clk ? 0 : clk->enable_count;
> @@ -1150,13 +1163,7 @@ static struct clk *__clk_init_parent(struct clk *clk)
>                         kzalloc((sizeof(struct clk*) * clk->num_parents),
>                                         GFP_KERNEL);
>  
> -       if (!clk->parents)
> -               ret = __clk_lookup(clk->parent_names[index]);
> -       else if (!clk->parents[index])
> -               ret = clk->parents[index] =
> -                       __clk_lookup(clk->parent_names[index]);
> -       else
> -               ret = clk->parents[index];
> +       ret = __clk_get_parent_by_index(clk, index);
>  
>  out:
>         return ret;
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 7f197d7..4e0b634 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -347,6 +347,7 @@ const char *__clk_get_name(struct clk *clk);
>  struct clk_hw *__clk_get_hw(struct clk *clk);
>  u8 __clk_get_num_parents(struct clk *clk);
>  struct clk *__clk_get_parent(struct clk *clk);
> +struct clk *__clk_get_parent_by_index(struct clk *clk, u8 index);
>  unsigned int __clk_get_enable_count(struct clk *clk);
>  unsigned int __clk_get_prepare_count(struct clk *clk);
>  unsigned long __clk_get_rate(struct clk *clk);
> -- 
> 1.8.1.2
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