ASoC: mediatek: Add mt8195 reset control support

Merge series from Trevor Wu <trevor.wu@mediatek.com>:

Add reset controller support for MT8195.

Documentation/devicetree/bindings/sound/mt8195-afe-pcm.yaml

@@ -19,6 +19,12 @@ properties:
   interrupts:
     maxItems: 1
 
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: audiosys
+
   memory-region:
     maxItems: 1
     description: |
@@ -127,6 +133,8 @@ required:
   - compatible
   - reg
   - interrupts
+  - resets
+  - reset-names
   - mediatek,topckgen
   - power-domains
   - clocks
@@ -144,6 +152,8 @@ examples:
         compatible = "mediatek,mt8195-audio";
         reg = <0x10890000 0x10000>;
         interrupts = <GIC_SPI 822 IRQ_TYPE_LEVEL_HIGH 0>;
+        resets = <&watchdog 14>;
+        reset-names = "audiosys";
         mediatek,topckgen = <&topckgen>;
         power-domains = <&spm 7>; //MT8195_POWER_DOMAIN_AUDIO
         memory-region = <&snd_dma_mem_reserved>;

sound/soc/mediatek/mt8195/mt8195-afe-pcm.c

@@ -16,6 +16,7 @@
 #include <linux/of_platform.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include "mt8195-afe-common.h"
 #include "mt8195-afe-clk.h"
 #include "mt8195-reg.h"
@@ -3056,6 +3057,7 @@ static int mt8195_afe_pcm_dev_probe(struct platform_device *pdev)
 	struct mtk_base_afe *afe;
 	struct mt8195_afe_private *afe_priv;
 	struct device *dev = &pdev->dev;
+	struct reset_control *rstc;
 	int i, irq_id, ret;
 	struct snd_soc_component *component;
 
@@ -3092,6 +3094,20 @@ static int mt8195_afe_pcm_dev_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* reset controller to reset audio regs before regmap cache */
+	rstc = devm_reset_control_get_exclusive(dev, "audiosys");
+	if (IS_ERR(rstc)) {
+		ret = PTR_ERR(rstc);
+		dev_err(dev, "could not get audiosys reset:%d\n", ret);
+		return ret;
+	}
+
+	ret = reset_control_reset(rstc);
+	if (ret) {
+		dev_err(dev, "failed to trigger audio reset:%d\n", ret);
+		return ret;
+	}
+
 	spin_lock_init(&afe_priv->afe_ctrl_lock);
 
 	mutex_init(&afe->irq_alloc_lock);