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Commit 66b47fdb authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Implement WM8994 OPCLK support 



The WM8994 can output a clock derived from its internal SYSCLK, called
OPCLK.  The rate can be selected as a sysclk, with a division from the
SYSCLK rate specified (multiplied by 10 since a division of 5.5 is
supported) and the clock can be disabled by specifying a divisor of
zero.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent e88ff1e6

sound/soc/codecs/wm8994.c

+23 −0
Original line number Diff line number Diff line
@@ -2492,6 +2492,7 @@ static const struct snd_kcontrol_new aif3adc_mux = 
static const struct snd_soc_dapm_widget wm8994_dapm_widgets[] = {

SND_SOC_DAPM_INPUT("DMIC1DAT"),

SND_SOC_DAPM_INPUT("DMIC2DAT"),

SND_SOC_DAPM_INPUT("Clock"),



SND_SOC_DAPM_SUPPLY("CLK_SYS", SND_SOC_NOPM, 0, 0, clk_sys_event,

		    SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
@@ -2966,11 +2967,14 @@ static int wm8994_set_fll(struct snd_soc_dai *dai, int id, int src, 
	return 0;

}



static int opclk_divs[] = { 10, 20, 30, 40, 55, 60, 80, 120, 160 };



static int wm8994_set_dai_sysclk(struct snd_soc_dai *dai,

		int clk_id, unsigned int freq, int dir)

{

	struct snd_soc_codec *codec = dai->codec;

	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);

	int i;



	switch (dai->id) {

	case 1:
@@ -3008,6 +3012,25 @@ static int wm8994_set_dai_sysclk(struct snd_soc_dai *dai, 
		dev_dbg(dai->dev, "AIF%d using FLL2\n", dai->id);

		break;



	case WM8994_SYSCLK_OPCLK:

		/* Special case - a division (times 10) is given and

		 * no effect on main clocking. 

		 */

		if (freq) {

			for (i = 0; i < ARRAY_SIZE(opclk_divs); i++)

				if (opclk_divs[i] == freq)

					break;

			if (i == ARRAY_SIZE(opclk_divs))

				return -EINVAL;

			snd_soc_update_bits(codec, WM8994_CLOCKING_2,

					    WM8994_OPCLK_DIV_MASK, i);

			snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_2,

					    WM8994_OPCLK_ENA, WM8994_OPCLK_ENA);

		} else {

			snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_2,

					    WM8994_OPCLK_ENA, 0);

		}



	default:

		return -EINVAL;

	}

sound/soc/codecs/wm8994.h

+3 −0
Original line number Diff line number Diff line
@@ -20,6 +20,9 @@ extern struct snd_soc_dai wm8994_dai[]; 
#define WM8994_SYSCLK_FLL1  3

#define WM8994_SYSCLK_FLL2  4



/* OPCLK is also configured with set_dai_sysclk, specify division*10 as rate. */

#define WM8994_SYSCLK_OPCLK 5



#define WM8994_FLL1 1

#define WM8994_FLL2 2