From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/4] clk: Add a generic clock infrastructure
Date: Fri, 20 May 2011 11:59:36 +0000 [thread overview]
Message-ID: <20110520115936.GA10931@pengutronix.de> (raw)
In-Reply-To: <1305876469.326305.518470530485.1.gpush@pororo>
Hi Jeremy,
Nice to see progress in this area :)
On Fri, May 20, 2011 at 03:27:49PM +0800, Jeremy Kerr wrote:
> +
> +struct clk *clk_register(struct clk_hw_ops *ops, struct clk_hw *hw,
> + const char *name)
> +{
> + struct clk *clk;
> +
> + clk = kzalloc(sizeof(*clk), GFP_KERNEL);
> + if (!clk)
> + return NULL;
> +
> + clk->name = name;
> + clk->ops = ops;
> + clk->hw = hw;
> + hw->clk = clk;
is it worth to add a CLK_REGISTERED flag here? Up to now clocks do not
have to be registered at all and the registering might be forgotten for
some clocks. I suppose funny things can happen when we operate on
unregistered clocks.
> +
> + /* Query the hardware for parent and initial rate */
> +
> + if (clk->ops->get_parent)
> + /* We don't to lock against prepare/enable here, as
> + * the clock is not yet accessible from anywhere */
> + clk->parent = clk->ops->get_parent(clk->hw);
> +
> + if (clk->ops->recalc_rate)
> + clk->rate = clk->ops->recalc_rate(clk->hw);
This implicitely requires that we never register a clock before its
parent is registered. This makes perfect sense but I think we should
catch it here when the user tries to register a clock with a not yet
registered parent.
> +
> +
> + return clk;
> +}
> +EXPORT_SYMBOL_GPL(clk_register);
BTW we planned to let the linker do the job of registering static
clocks, but this is only convenience and can be added later.
Sascha
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next prev parent reply other threads:[~2011-05-20 11:59 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 7:27 [PATCH 0/4] Add a generic struct clk Jeremy Kerr
2011-05-20 7:27 ` [PATCH 4/4] clk: Add simple gated clock Jeremy Kerr
2011-05-20 11:37 ` Arnd Bergmann
2011-05-20 22:19 ` Rob Herring
2011-05-20 7:27 ` [PATCH 2/4] clk: Implement clk_set_rate Jeremy Kerr
2011-05-20 12:25 ` Sascha Hauer
2011-05-24 7:59 ` Colin Cross
2011-05-25 19:03 ` Sascha Hauer
[not found] ` <1306373867.2875.162.camel@pororo>
2011-05-26 6:54 ` Sascha Hauer
2011-05-30 5:05 ` Mike Frysinger
2011-05-20 7:27 ` [PATCH 3/4] clk: Add fixed-rate clock Jeremy Kerr
2011-05-30 5:01 ` Mike Frysinger
2011-05-30 5:02 ` Mike Frysinger
2011-05-20 7:27 ` [PATCH 1/4] clk: Add a generic clock infrastructure Jeremy Kerr
2011-05-20 11:59 ` Sascha Hauer [this message]
2011-05-20 13:25 ` Thomas Gleixner
2011-05-20 13:36 ` Sascha Hauer
2011-05-23 23:55 ` Colin Cross
2011-05-24 7:02 ` Sascha Hauer
2011-05-24 7:51 ` Colin Cross
2011-05-24 8:38 ` Sascha Hauer
2011-05-25 11:22 ` Richard Zhao
2011-05-25 11:43 ` Thomas Gleixner
2011-05-24 4:30 ` viresh kumar
2011-05-25 10:47 ` Richard Zhao
2011-05-30 5:00 ` Mike Frysinger
2011-05-23 23:12 ` [PATCH 0/4] Add a generic struct clk Colin Cross
2011-05-24 6:26 ` Sascha Hauer
2011-05-24 7:31 ` Colin Cross
2011-05-24 8:09 ` Sascha Hauer
2011-05-24 19:41 ` Colin Cross
2011-05-25 2:32 ` Richard Zhao
2011-05-25 6:23 ` Sascha Hauer
2011-05-25 7:51 ` Thomas Gleixner
2011-05-27 14:39 ` Mark Brown
2011-05-24 17:22 ` Richard Zhao
2011-05-24 17:52 ` Colin Cross
2011-05-25 2:08 ` Richard Zhao
2011-05-30 5:20 ` Mike Frysinger
2011-07-10 9:09 ` Mark Brown
2011-07-10 9:50 ` Russell King - ARM Linux
2011-07-10 10:00 ` Russell King - ARM Linux
2011-07-10 11:27 ` Mark Brown
2011-07-10 11:52 ` Russell King - ARM Linux
2011-07-11 2:49 ` Jeremy Kerr
2011-07-11 3:57 ` Mark Brown
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