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ASoC: dmic: add regulator support

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Merge series from Olivier Moysan <olivier.moysan@foss.st.com>:

Digital microphones may be supplied by a regulator. Add regulator
support in dmic codec, to allow power management of the regulator
through the ASoC DAPM widgets.
This commit is contained in:
Mark Brown
2025-03-09 13:42:47 +00:00
parent db91ad81a2 d3321a20b5
commit 1ec3f1dc21
2 changed files with 21 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/sound/dmic-codec.yaml
View File

@@ -19,6 +19,9 @@ properties:
'#sound-dai-cells':
const: 0
vref-supply:
description: Phandle to the digital microphone reference supply
dmicen-gpios:
description: GPIO specifier for DMIC to control start and stop
maxItems: 1

19
sound/soc/codecs/dmic.c
View File

@@ -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))