linux-kernel - [PATCH 2/3] ASoC: stm32: dfsdm: add pm

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Date:   Thu, 18 Nov 2021 10:00:34 +0100
From:   Olivier Moysan <olivier.moysan@...s.st.com>
To:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Olivier Moysan <olivier.moysan@...s.st.com>,
        Takashi Iwai <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 2/3] ASoC: stm32: dfsdm: add pm_runtime support for audio

Enable support of pm_runtime on STM32 DFSDM audio driver
to allow power state monitoring.

Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
---
 sound/soc/stm/stm32_adfsdm.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c
index e6078f50e508..534f96af97c5 100644
--- a/sound/soc/stm/stm32_adfsdm.c
+++ b/sound/soc/stm/stm32_adfsdm.c
@@ -12,7 +12,7 @@
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
-
+#include <linux/pm_runtime.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/consumer.h>
 #include <linux/iio/adc/stm32-dfsdm-adc.h>
@@ -363,15 +363,20 @@ static int stm32_adfsdm_probe(struct platform_device *pdev)
 #endif
 
 	ret = snd_soc_add_component(component, NULL, 0);
-	if (ret < 0)
+	if (ret < 0) {
 		dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
 			__func__);
+		return ret;
+	}
 
-	return ret;
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
 }
 
 static int stm32_adfsdm_remove(struct platform_device *pdev)
 {
+	pm_runtime_disable(&pdev->dev);
 	snd_soc_unregister_component(&pdev->dev);
 
 	return 0;
-- 
2.17.1