linux-kernel - Re: [PATCH V2] clk: Add composite clock type

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Date:	Mon, 4 Feb 2013 10:37:39 +0100
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Prashant Gaikwad <pgaikwad@...dia.com>
CC:	"mturquette@...aro.org" <mturquette@...aro.org>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V2] clk: Add composite clock type

Hi Prashant,

Prashant Gaikwad <pgaikwad@...dia.com> wrote @ Mon, 4 Feb 2013 09:11:22 +0100:

> +struct clk *clk_register_composite(struct device *dev, const char *name,
> +                       const char **parent_names, int num_parents,
> +                       struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
> +                       struct clk_hw *div_hw, const struct clk_ops *div_ops,
> +                       struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
> +                       unsigned long flags)
> +{
> +       struct clk *clk;
> +       struct clk_init_data init;
> +       struct clk_composite *composite;
> +       struct clk_ops *clk_composite_ops;
> +
> +       composite = kzalloc(sizeof(*composite), GFP_KERNEL);
> +       if (!composite) {
> +               pr_err("%s: could not allocate composite clk\n", __func__);
> +               return ERR_PTR(-ENOMEM);
> +       }
> +
> +       init.name = name;
> +       init.flags = flags | CLK_IS_BASIC;
> +       init.parent_names = parent_names;
> +       init.num_parents = num_parents;
> +
> +       /* allocate the clock ops */
> +       clk_composite_ops = kzalloc(sizeof(*clk_composite_ops), GFP_KERNEL);

The members of "clk_composite_ops" seems to be always assigned
statically. Istead of dynamically allocating/assigning, can't we just
have "clk_composite_ops" statically as below?

static struct clk_ops clk_composite_ops = {
	.get_parent = clk_composite_get_parent;
	.set_parent = clk_composite_set_parent;
	.recalc_rate = clk_composite_recalc_rate;
	.round_rate = clk_composite_round_rate;
	.set_rate = clk_composite_set_rate;
	.is_enabled = clk_composite_is_enabled;
	.enable = clk_composite_enable;
	.disable = clk_composite_disable;
};

struct clk *clk_register_composite(struct device *dev, const char *name,
		       const char **parent_names, int num_parents,
		       struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
		       struct clk_hw *div_hw, const struct clk_ops *div_ops,
		       struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
		       unsigned long flags)
{
	.....

	init.ops = &clk_composite_ops;
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