[PATCH 4/4] ASoC: add mmp brownstone support

[broonie@opensource.wolfsonmicro.com (Mark Brown)]

On Fri, May 25, 2012 at 03:11:03PM +0800, Zhangfei Gao wrote:

> +config SND_MMP_SOC_BROWNSTONE
> +	tristate "SoC Audio support for Marvell Brownstone"
> +	depends on SND_MMP_SOC && MACH_BROWNSTONE
> +	select SND_MMP_SOC_SSPA
> +	select SND_SOC_WM8994

Should depend on MFD_WM8994.

> +static void brownstone_ext_control(struct snd_soc_dapm_context *dapm)
> +{

This stuff is really unexpected in a modern machine driver, it was used
on things like spitz due to the odd wiring but for modern stuff I'd not
expect to see it.

> +	if (brownstone_spk_func == BROWNSTONE_SPK_ON) {
> +		snd_soc_dapm_enable_pin(dapm, "Ext Left Spk");
> +		snd_soc_dapm_enable_pin(dapm, "Ext Right Spk");
> +	} else {
> +		snd_soc_dapm_disable_pin(dapm, "Ext Left Spk");
> +		snd_soc_dapm_disable_pin(dapm, "Ext Right Spk");
> +	}

Just define a single widget for the speakers and use a
SND_SOC_DAPM_PIN_SWITCH().

> +	/* set up jack connection */
> +	switch (brownstone_jack_func) {
> +	case BROWNSTONE_HP:
> +		snd_soc_dapm_disable_pin(dapm, "Headset Mic");
> +		snd_soc_dapm_enable_pin(dapm, "Main Mic");
> +		snd_soc_dapm_enable_pin(dapm, "Headset Stereophone");
> +		break;

This should all be autodetectable, users having to manually select it is
*very* unusual.  Is there really no accessory detection hardware on the
board?

> +	snd_soc_dapm_enable_pin(dapm, "Ext Left Spk");
> +	snd_soc_dapm_enable_pin(dapm, "Ext Right Spk");
> +	snd_soc_dapm_enable_pin(dapm, "Headset Stereophone");
> +	snd_soc_dapm_enable_pin(dapm, "Headset Mic");
> +	snd_soc_dapm_enable_pin(dapm, "Main Mic");

Everything is enable dby default.

> +	/* turn on micbias 1/2 always */
> +	snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_1,
> +			    WM8994_MICB1_ENA_MASK |
> +			    WM8994_MICB2_ENA_MASK,
> +			    WM8994_MICB1_ENA |
> +			    WM8994_MICB2_ENA);

If you need to do this force enable them with DAPM, this won't work
anyway as the widgets will be powered off as soon as DAPM notices
they're on.

> +	snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
> +		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
> +
> +	snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
> +		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);

Set this in the dai_link.

> +static struct platform_driver mmp_driver = {
> +	.driver		= {
> +		.name	= "mmp-audio",

Should probably be something like "brownstone-audio".
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