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From:   Tzung-Bi Shih <tzungbi@google.com>
Date:   Fri, 30 Oct 2020 17:23:10 +0800
Message-ID: <CA+Px+wXPRg7aDU5+vr6R_BxuFfhuDeG3iEQeAUKWNtX8YmVC1Q@mail.gmail.com>
Subject: Re: [PATCH v2 2/2] ASoC: qcom: sc7180: Modify machine driver for 2mic
To:     Ajye Huang <ajye.huang@gmail.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Rohit kumar <rohitkr@codeaurora.org>,
        Banajit Goswami <bgoswami@codeaurora.org>,
        Patrick Lai <plai@codeaurora.org>,
        Srinivasa Rao Mandadapu <srivasam@codeaurora.org>,
        Srini Kandagatla <srinivas.kandagatla@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Cheng-Yi Chiang <cychiang@chromium.org>,
        Tzung-Bi Shih <tzungbi@chromium.org>,
        Douglas Anderson <dianders@chromium.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
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        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        ALSA development <alsa-devel@alsa-project.org>,
        Ajye Huang <ajye_huang@compal.corp-partner.google.com>
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On Fri, Oct 30, 2020 at 3:57 PM Ajye Huang <ajye.huang@gmail.com> wrote:
> +static struct gpio_desc *dmic_sel;
> +static int dmic_switch;

If you really need them, you should put them in struct sc7180_snd_data.

> +static int dmic_set(struct snd_kcontrol *kcontrol,
> +                   struct snd_ctl_elem_value *ucontrol)
> +{
> +       if (dmic_sel) {

if (IS_ERR(dmic_sel))
But I think you don't need to check dmic_sel.  Suppose your _probe()
already returned error, the code here shouldn't be called.

> +               dmic_switch = ucontrol->value.integer.value[0];

Looks like it can be a local variable.  You don't need to save dmic_switch.