linux-kernel - Re: [alsa-devel] [PATCH v2] ASoC: da7210: Add support for PLL and SRM

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Message-ID: <20120123112142.GA29465@opensource.wolfsonmicro.com>
Date:	Mon, 23 Jan 2012 11:21:43 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Chavan <ashish.chavan@...tcummins.com>
Cc:	lrg <lrg@...com>, alsa-devel <alsa-devel@...a-project.org>,
	David Dajun Chen <david.chen@...semi.com>,
	"kuninori.morimoto.gx" <kuninori.morimoto.gx@...esas.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH v2] ASoC: da7210: Add support for PLL and SRM

On Mon, Jan 23, 2012 at 03:37:21PM +0530, Ashish Chavan wrote:

> +/* PLL out frequency values */
> +#define FOUT_2822400		2822400
> +#define FOUT_3072000		3072000

It's difficult to see what these defines are adding.

> +static const u32 da7210_fout_2822400_div[][DIV_CNT + 1] = {
> +	{ 12000000, 0xE8, 0x6C, 0x2, },		/* MCLK=12Mhz    Fs=44.1Khz */

You're still using magic numbers to find the dividers, and clearly the
same rate comment should apply to the whole table not specific entries.

> +		/* In PLL master mode, use master mode PLL dividers */
> +		if (fout == FOUT_2822400) {


> +		} else if (fout == FOUT_3072000) {

This looks like a switch statement and...

> +			for (row_idx = 0; row_idx < FREF_CNT; row_idx++) {

ARRAY_SIZE()

> +				if (fref == da7210_fout_3072000_div[row_idx]
> +								[FREF_IDX]) {
> +					pll_div1 =
> +						da7210_fout_3072000_div[row_idx]
> +						[DIV1_IDX];

...this code is shared between both branches (as well as the SRM case)
and should be factored out between them.
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