ASoC: dmic: add regulator support

Allow management of the regulator that may be used to supply the
digital microphone.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20250306171840.593443-3-olivier.moysan@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index 0388f115470c244187577708cad747f6751bdc2f..5d3c3f17c6d8d92ba1ed3be946a56fa6851dfb0f 100644 (file)
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -9,6 +9,7 @@
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <sound/core.h>
@@ -25,6 +26,7 @@ module_param(wakeup_delay, uint, 0644);
 
 struct dmic {
        struct gpio_desc *gpio_en;
+       struct regulator *vref;
        int wakeup_delay;
        /* Delay after DMIC mode switch */
        int modeswitch_delay;
@@ -55,22 +57,33 @@ static int dmic_aif_event(struct snd_soc_dapm_widget *w,
                          struct snd_kcontrol *kcontrol, int event) {
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct dmic *dmic = snd_soc_component_get_drvdata(component);
+       int ret = 0;
 
        switch (event) {
        case SND_SOC_DAPM_POST_PMU:
                if (dmic->gpio_en)
                        gpiod_set_value_cansleep(dmic->gpio_en, 1);
 
+               if (dmic->vref) {
+                       ret = regulator_enable(dmic->vref);
+                       if (ret)
+                               return ret;
+               }
+
                if (dmic->wakeup_delay)
                        msleep(dmic->wakeup_delay);
                break;
        case SND_SOC_DAPM_POST_PMD:
                if (dmic->gpio_en)
                        gpiod_set_value_cansleep(dmic->gpio_en, 0);
+
+               if (dmic->vref)
+                       ret = regulator_disable(dmic->vref);
+
                break;
        }
 
-       return 0;
+       return ret;
 }
 
 static struct snd_soc_dai_driver dmic_dai = {
@@ -100,6 +113,10 @@ static int dmic_component_probe(struct snd_soc_component *component)
        if (!dmic)
                return -ENOMEM;
 
+       dmic->vref = devm_regulator_get_optional(component->dev, "vref");
+       if (IS_ERR(dmic->vref) && PTR_ERR(dmic->vref) != -ENODEV)
+               return dev_err_probe(component->dev, PTR_ERR(dmic->vref), "Failed to get vref\n");
+
        dmic->gpio_en = devm_gpiod_get_optional(component->dev,
                                                "dmicen", GPIOD_OUT_LOW);
        if (IS_ERR(dmic->gpio_en))