ASoC: dwc: add reset support

Commit Message

Maxim Kochetkov April 21, 2023, 7:33 p.m. UTC

Some SoC may have resets for I2S subsystem. So add optional reset
deassert at startup.

Signed-off-by: Maxim Kochetkov <[e-mail]>
---
 sound/soc/dwc/dwc-i2s.c | 9 +++++++++
 sound/soc/dwc/local.h   | 1 +
 2 files changed, 10 insertions(+)

Patch

diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index acdf98b2ee9c..8c8bc7116f86 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -17,6 +17,7 @@ 
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <sound/designware_i2s.h>
@@ -648,6 +649,14 @@  static int dw_i2s_probe(struct platform_device *pdev)
 	if (IS_ERR(dev->i2s_base))
 		return PTR_ERR(dev->i2s_base);
 
+	dev->reset = devm_reset_control_array_get_optional_shared(&pdev->dev);
+	if (IS_ERR(dev->reset))
+		return PTR_ERR(dev->reset);
+
+	ret = reset_control_deassert(dev->reset);
+	if (ret)
+		return ret;
+
 	dev->dev = &pdev->dev;
 
 	irq = platform_get_irq_optional(pdev, 0);
diff --git a/sound/soc/dwc/local.h b/sound/soc/dwc/local.h
index 1c361eb6127e..d64bd4f8fd34 100644
--- a/sound/soc/dwc/local.h
+++ b/sound/soc/dwc/local.h
@@ -89,6 +89,7 @@  union dw_i2s_snd_dma_data {
 struct dw_i2s_dev {
 	void __iomem *i2s_base;
 	struct clk *clk;
+	struct reset_control *reset;
 	int active;
 	unsigned int capability;
 	unsigned int quirks;