linux-kernel - Re: Locking in the clk API, part 2: clk_prepare/clk

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Message-ID: <20110204132040.GI14627@n2100.arm.linux.org.uk>
Date:	Fri, 4 Feb 2011 13:20:40 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Richard Zhao <linuxzsc@...il.com>
Cc:	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Saravana Kannan <skannan@...eaurora.org>,
	linux-sh@...r.kernel.org,
	Ben Herrenschmidt <benh@...nel.crashing.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Dima Zavin <dmitriyz@...gle.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Locking in the clk API, part 2: clk_prepare/clk_unprepare

On Fri, Feb 04, 2011 at 08:45:34PM +0800, Richard Zhao wrote:
> > == Implementation ==
> > 
> > Basically:
> > 
> > struct clk {
> > 	const struct clk_ops *ops
> > 	int                  enable_count;
> > 	spinlock_t           enable_lock;
> > 	int                  prepare_count;
> > 	struct mutex         prepare_lock;
> > };
> > 
> > int clk_enable(struct clk *clk)
> > {
> > 	int ret = 0;
> > 
> > 	spin_lock(&clk->enable_lock);
> > 	if (!clk->enable_count)
> > 		ret = clk->ops->enable(clk);
> > 
> > 	if (!ret)
> > 		clk->enable_count++;
> > 	spin_unlock(&clk->enable_lock);
> > 
> > 	return ret;
> > }
> Why do we not call parent's clk_enable in this function? For flexible? How many
> different cases is causing us to move the effert to platform clock driver?

You may notice that struct clk above doesn't have a parent.
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