linux-kernel - Re: [PATCH v1 2/2] ASoC: dmic: Add optional dmic selection

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Date:   Fri, 28 Oct 2022 12:57:58 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
Cc:     linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, robh@...nel.org,
        Shengjiu Wang <shengjiu.wang@....com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        angelogioacchino.delregno@...labora.corp-partner.google.com,
        devicetree@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v1 2/2] ASoC: dmic: Add optional dmic selection

On Fri, Oct 28, 2022 at 06:24:50PM +0800, Ajye Huang wrote:

> +	dmic->dmic_sel = devm_gpiod_get_optional(component->dev,
> +						"dmic_sel", GPIOD_OUT_LOW);
> +	if (IS_ERR(dmic->dmic_sel))
> +		return PTR_ERR(dmic->dmic_sel);
> +
>  	snd_soc_component_set_drvdata(component, dmic);
>  
>  	return 0;
> @@ -125,10 +172,15 @@ static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
>  			       SND_SOC_NOPM, 0, 0, dmic_aif_event,
>  			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
>  	SND_SOC_DAPM_INPUT("DMic"),
> +	SND_SOC_DAPM_MIC("DMIC", NULL),
> +	SND_SOC_DAPM_MUX("Dmic Mux", SND_SOC_NOPM, 0, 0, &dmic_mux_control),

If we are doing this then adding the mux needs to be conditional on
having the GPIO, without the GPIO the control is at best confusing to
users.

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