linux-kernel - Re: [PATCHv2 05/11] mxc: Core support for i.MX5 series of processors from Freescale

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Message-ID: <20100203092453.GA21921@n2100.arm.linux.org.uk>
Date:	Wed, 3 Feb 2010 09:24:53 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Amit Kucheria <amit.kucheria@...onical.com>
Cc:	List Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, s.hauer@...gutronix.de,
	valentin.longchamp@...l.ch, daniel@...aq.de,
	grant.likely@...retlab.ca, Dinh.Nguyen@...escale.com,
	r.herring@...escale.com, bryan.wu@...onical.com
Subject: Re: [PATCHv2 05/11] mxc: Core support for i.MX5 series of
	processors from Freescale

On Tue, Feb 02, 2010 at 09:16:27PM -0800, Amit Kucheria wrote:
> +static int _clk_pll_set_rate(struct clk *clk, unsigned long rate)
> +{
> +	u32 reg;
> +	void __iomem *pllbase;
> +
> +	long mfi, pdf, mfn, mfd = 999999;
> +	s64 temp64;
> +	unsigned long quad_parent_rate;
> +	unsigned long pll_hfsm, dp_ctl;
> +	unsigned long parent_rate;
> +
> +	parent_rate = clk_get_rate(clk->parent);
> +
> +	pllbase = _get_pll_base(clk);
> +
> +	quad_parent_rate = 4 * parent_rate;
> +	pdf = mfi = -1;
> +	while (++pdf < 16 && mfi < 5)
> +		mfi = rate * (pdf+1) / quad_parent_rate;
> +	if (mfi > 15)
> +		return -1;

Why not "return -EPERM" since what you're actually saying here by
returning -1 is "Permission Denied"?  If you didn't mean "Permission
Denied", then don't use return -1.
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