linux-kernel - Re: [PATCH A 01/10] OMAP2/3: Add non-CORE DPLL rate set code and M, N programming

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Date:	Thu, 29 Jan 2009 14:23:03 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Paul Walmsley <paul@...an.com>
Cc:	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH A 01/10] OMAP2/3: Add non-CORE DPLL rate set code and M, N programming

On Tue, Jan 27, 2009 at 07:12:47PM -0700, Paul Walmsley wrote:
> +/* Non-CORE DPLL rate set code */
> +
> +/*
> + * omap3_noncore_dpll_program - set non-core DPLL M,N values directly
> + * @clk: struct clk * of DPLL to set
> + * @m: DPLL multiplier to set
> + * @n: DPLL divider to set
> + * @freqsel: FREQSEL value to set
> + *
> + * Program the DPLL with the supplied M, N values, and wait for the DPLL to
> + * lock..  Returns -EINVAL upon error, or 0 upon success.
> + */
> +static int omap3_noncore_dpll_program(struct clk *clk, u16 m, u8 n, u16 freqsel)
> +{
> +	struct dpll_data *dd;
> +	u32 v;
> +
> +	if (!clk)
> +		return -EINVAL;
> +
> +	dd = clk->dpll_data;
> +	if (!dd)
> +		return -EINVAL;

Final point... this is only called from the function below, which also
checks that clk and clk->dpll_data are both non-NULL.  So these checks
are unnecessary.

> +static int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
> +{
> +	u16 freqsel;
> +	struct dpll_data *dd;
> +
> +	if (!clk || !rate)
> +		return -EINVAL;
> +
> +	dd = clk->dpll_data;
> +	if (!dd)
> +		return -EINVAL;
> +
> +	if (rate == omap2_get_dpll_rate(clk))
> +		return 0;
> +
> +	if (dd->last_rounded_rate != rate)
> +		omap2_dpll_round_rate(clk, rate);
> +
> +	if (dd->last_rounded_rate == 0)
> +		return -EINVAL;
> +
> +	freqsel = _omap3_dpll_compute_freqsel(clk, dd->last_rounded_n);
> +	if (!freqsel)
> +		WARN_ON(1);
> +
> +	omap3_noncore_dpll_program(clk, dd->last_rounded_m, dd->last_rounded_n,
> +				   freqsel);
> +
> +	omap3_dpll_recalc(clk);
> +
> +	return 0;
> +}
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