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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 5 Feb 2013 14:03:41 +0530
From:	Prashant Gaikwad <pgaikwad@...dia.com>
To:	Hiroshi Doyu <hdoyu@...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

On Monday 04 February 2013 03:07 PM, Hiroshi Doyu wrote:
> 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;

No, clk_ops depends on the clocks you are using. There could be a clock 
with mux and gate while another one with mux and div.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/