[PATCH v3 17/25] ASoC: renesas: rz-ssi: Add runtime PM support

[Claudiu <claudiu.beznea@xxxxxxxxx>]

From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>

Add runtime PM support to the ssi driver. This assert/de-assert the
reset lines on runtime suspend/resume. Along with it the de-assertion of
the reset line from probe function was removed as it is not necessary
anymore.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
---

Changes in v3:
- s/sh/renesas in patch title

Changes in v2:
- none

 sound/soc/renesas/rz-ssi.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c
index 01e8b6a4e8a8..d0e2665ec830 100644
--- a/sound/soc/renesas/rz-ssi.c
+++ b/sound/soc/renesas/rz-ssi.c
@@ -1139,14 +1139,13 @@ static int rz_ssi_probe(struct platform_device *pdev)
 		goto err_release_dma_chs;
 	}
 
-	reset_control_deassert(ssi->rstc);
 	/* Default 0 for power saving. Can be overridden via sysfs. */
 	pm_runtime_set_autosuspend_delay(dev, 0);
 	pm_runtime_use_autosuspend(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable runtime PM!\n");
-		goto err_reset;
+		goto err_release_dma_chs;
 	}
 
 	ret = devm_snd_soc_register_component(dev, &rz_ssi_soc_component,
@@ -1154,13 +1153,11 @@ static int rz_ssi_probe(struct platform_device *pdev)
 					      ARRAY_SIZE(rz_ssi_soc_dai));
 	if (ret < 0) {
 		dev_err(dev, "failed to register snd component\n");
-		goto err_reset;
+		goto err_release_dma_chs;
 	}
 
 	return 0;
 
-err_reset:
-	reset_control_assert(ssi->rstc);
 err_release_dma_chs:
 	rz_ssi_release_dma_channels(ssi);
 
@@ -1182,10 +1179,29 @@ static const struct of_device_id rz_ssi_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, rz_ssi_of_match);
 
+static int rz_ssi_runtime_suspend(struct device *dev)
+{
+	struct rz_ssi_priv *ssi = dev_get_drvdata(dev);
+
+	return reset_control_assert(ssi->rstc);
+}
+
+static int rz_ssi_runtime_resume(struct device *dev)
+{
+	struct rz_ssi_priv *ssi = dev_get_drvdata(dev);
+
+	return reset_control_deassert(ssi->rstc);
+}
+
+static const struct dev_pm_ops rz_ssi_pm_ops = {
+	RUNTIME_PM_OPS(rz_ssi_runtime_suspend, rz_ssi_runtime_resume, NULL)
+};
+
 static struct platform_driver rz_ssi_driver = {
 	.driver	= {
 		.name	= "rz-ssi-pcm-audio",
 		.of_match_table = rz_ssi_of_match,
+		.pm = pm_ptr(&rz_ssi_pm_ops),
 	},
 	.probe		= rz_ssi_probe,
 	.remove		= rz_ssi_remove,
-- 
2.39.2