[alsa-devel] [PATCH 1/3] ad193x: add set_pll entry to support different clock input

[Mark Brown]

On Wed, Apr 21, 2010 at 05:36:47PM +0800, Barry Song wrote:
> Signed-off-by: Barry Song <21cnbao at gmail.com>

> +static int ad193x_set_dai_pll(struct snd_soc_dai *codec_dai,
> +		int pll_id, int source, unsigned int freq_in, unsigned int freq_out)
> +{
> +	struct snd_soc_codec *codec = codec_dai->codec;
> +	int reg;
> +
> +	reg = snd_soc_read(codec, AD193X_PLL_CLK_CTRL0);
> +
> +	switch (freq_in) {
> +	case 12288000:
> +		reg = (reg & AD193X_PLL_INPUT_MASK) | AD193X_PLL_INPUT_256;
> +		break;

This all looks like you should just implement set_sysclk() not set_pll()
- from the user point of view the fact that a PLL ends up getting tuned
is immaterial here, they can't control the output frequency at all.