[PATCH v2 10/17] ASoC: simple-amplifier: gpio-audio-amp: Add support for extra power supplies

Herve Codina
2026-04-29T07:44:37Z

The gpio-audio-amp devices can use additional power supplies:
- vddio,
- vdda1,
- vdda2

Add support for those additional power supplies.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
sound/soc/codecs/simple-amplifier.c | 85 ++++++++++++++++++++++++++++-
1 file changed, 82 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/simple-amplifier.c b/sound/soc/codecs/simple-amplifier.c
index ab4fa074603e..537731996544 100644
--- a/sound/soc/codecs/simple-amplifier.c
+++ b/sound/soc/codecs/simple-amplifier.c
@@ -15,6 +15,7 @@
struct simple_amp_data {
unsigned int supports;
#define SIMPLE_AUDIO_SUPPORT_PGA BIT(0)
+#define SIMPLE_AUDIO_SUPPORT_POWER_SUPPLIES BIT(1)

const struct snd_soc_dapm_widget *dapm_widgets;
unsigned int num_dapm_widgets;
@@ -127,10 +128,86 @@ static int simple_amp_add_basic_dapm(struct snd_soc_component *component)
return 0;
}

+struct simple_amp_supply {
+ const char *prop_name;
+ const struct snd_soc_dapm_widget dapm_widget;
+ const struct snd_soc_dapm_route dapm_route;
+};
+
+static const struct simple_amp_supply simple_amp_supplies[] = {
+ {
+ .prop_name = "vddio-supply",
+ .dapm_widget = SND_SOC_DAPM_REGULATOR_SUPPLY("vddio", 0, 0),
+ .dapm_route = { "PGA", NULL, "vddio" },
+ }, {
+ .prop_name = "vdda1-supply",
+ .dapm_widget = SND_SOC_DAPM_REGULATOR_SUPPLY("vdda1", 0, 0),
+ .dapm_route = { "PGA", NULL, "vdda1" },
+ }, {
+ .prop_name = "vdda2-supply",
+ .dapm_widget = SND_SOC_DAPM_REGULATOR_SUPPLY("vdda2", 0, 0),
+ .dapm_route = { "PGA", NULL, "vdda2" },
+ },
+ { /* End of list */}
+};
+
+static int simple_amp_add_power_supplies(struct snd_soc_component *component)
+{
+ struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
+ struct simple_amp *simple_amp = snd_soc_component_get_drvdata(component);
+ const struct simple_amp_supply *supply;
+ struct device *dev = component->dev;
+ int ret;
+
+ /*
+ * Those additional power supplies are attached to the PGA.
+ * If PGA is not supported, simply skipped them.
+ */
+ if (!(simple_amp->data->supports & SIMPLE_AUDIO_SUPPORT_PGA)) {
+ dev_err(dev, "Extra power supplied need PGA\n");
+ return -EINVAL;
+ }
+
+ supply = simple_amp_supplies;
+ do {
+ if (!of_property_present(dev->of_node, supply->prop_name))
+ continue;
+
+ ret = snd_soc_dapm_new_controls(dapm, &supply->dapm_widget, 1);
+ if (ret) {
+ dev_err(dev, "Failed to add control for '%s' (%d)\n",
+ supply->prop_name, ret);
+ return ret;
+ }
+ ret = snd_soc_dapm_add_routes(dapm, &supply->dapm_route, 1);
+ if (ret) {
+ dev_err(dev, "Failed to add route for '%s' (%d)\n",
+ supply->prop_name, ret);
+ return ret;
+ }
+ } while ((++supply)->prop_name);
+
+ return 0;
+}
+
static int simple_amp_component_probe(struct snd_soc_component *component)
{
+ struct simple_amp *simple_amp = snd_soc_component_get_drvdata(component);
+ int ret;
+
/* Add basic dapm widgets and routes */
- return simple_amp_add_basic_dapm(component);
+ ret = simple_amp_add_basic_dapm(component);
+ if (ret)
+ return ret;
+
+ /* Add additional power supplies */
+ if (simple_amp->data->supports & SIMPLE_AUDIO_SUPPORT_POWER_SUPPLIES) {
+ ret = simple_amp_add_power_supplies(component);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}

static const struct snd_soc_component_driver simple_amp_component_driver = {
@@ -170,7 +247,8 @@ static const struct simple_amp_data simple_audio_amplifier_data = {
};

static const struct simple_amp_data simple_audio_mono_pga_data = {
- .supports = SIMPLE_AUDIO_SUPPORT_PGA,
+ .supports = SIMPLE_AUDIO_SUPPORT_PGA |
+ SIMPLE_AUDIO_SUPPORT_POWER_SUPPLIES,
.dapm_widgets = simple_amp_mono_pga_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(simple_amp_mono_pga_dapm_widgets),
.dapm_routes = simple_amp_mono_pga_dapm_routes,
@@ -178,7 +256,8 @@ static const struct simple_amp_data simple_audio_mono_pga_data = {
};

static const struct simple_amp_data simple_audio_stereo_pga_data = {
- .supports = SIMPLE_AUDIO_SUPPORT_PGA,
+ .supports = SIMPLE_AUDIO_SUPPORT_PGA |
+ SIMPLE_AUDIO_SUPPORT_POWER_SUPPLIES,
.dapm_widgets = simple_amp_stereo_pga_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(simple_amp_stereo_pga_dapm_widgets),
.dapm_routes = simple_amp_stereo_pga_dapm_routes,
--
2.53.0