ASoC: fsl_audmix: Support the i.MX952 platform

Merge series from Shengjiu Wang <shengjiu.wang@nxp.com>:

Enable AUDMIX on i.MX952 platform, update dt binding document and
driver.

SAI is connected to AUDMIX, and the AUDMIX can be bypassed, so
add 'fsl,sai-amix-mode' property in SAI binding document for this
case.

Documentation/devicetree/bindings/sound/fsl,audmix.yaml

@@ -34,7 +34,9 @@ description: |
 
 properties:
   compatible:
-    const: fsl,imx8qm-audmix
+    enum:
+      - fsl,imx8qm-audmix
+      - fsl,imx952-audmix
 
   reg:
     maxItems: 1
@@ -80,7 +82,17 @@ required:
   - reg
   - clocks
   - clock-names
-  - power-domains
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8qm-audmix
+    then:
+      required:
+        - power-domains
 
 unevaluatedProperties: false
 

Documentation/devicetree/bindings/sound/fsl,sai.yaml

@@ -132,6 +132,13 @@ properties:
         - description: dataline mask for 'rx'
         - description: dataline mask for 'tx'
 
+  fsl,sai-amix-mode:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      The audmix module is bypassed from hardware or not.
+    enum: [none, bypass, audmix]
+    default: none
+
   fsl,sai-mclk-direction-output:
     description: SAI will output the SAI MCLK clock.
     type: boolean
@@ -179,6 +186,15 @@ allOf:
       properties:
         fsl,sai-synchronous-rx: false
 
+  - if:
+      required:
+        - fsl,sai-amix-mode
+    then:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx952-sai
+
 required:
   - compatible
   - reg

include/linux/firmware/imx/sm.h

@@ -26,6 +26,8 @@
 #define SCMI_IMX94_CTRL_SAI3_MCLK	5U	/*!< WAKE SAI3 MCLK */
 #define SCMI_IMX94_CTRL_SAI4_MCLK	6U	/*!< WAKE SAI4 MCLK */
 
+#define SCMI_IMX952_CTRL_BYPASS_AUDMIX	8U      /* WAKE AUDMIX */
+
 #if IS_ENABLED(CONFIG_IMX_SCMI_MISC_DRV)
 int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val);
 int scmi_imx_misc_ctrl_set(u32 id, u32 val);

sound/soc/fsl/fsl_audmix.c

@@ -444,6 +444,9 @@ static const struct of_device_id fsl_audmix_ids[] = {
 	{
 		.compatible = "fsl,imx8qm-audmix",
 	},
+	{
+		.compatible = "fsl,imx952-audmix",
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_audmix_ids);

sound/soc/fsl/fsl_sai.c

@@ -7,6 +7,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
+#include <linux/firmware/imx/sm.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pinctrl/consumer.h>
@@ -1425,10 +1426,12 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	struct fsl_sai *sai;
 	struct regmap *gpr;
 	void __iomem *base;
+	const char *str = NULL;
 	char tmp[8];
 	int irq, ret, i;
 	int index;
 	u32 dmas[4];
+	u32 val;
 
 	sai = devm_kzalloc(dev, sizeof(*sai), GFP_KERNEL);
 	if (!sai)
@@ -1598,6 +1601,24 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	if (ret < 0 && ret != -ENOSYS)
 		goto err_pm_get_sync;
 
+	if (of_device_is_compatible(np, "fsl,imx952-sai") &&
+	    !of_property_read_string(np, "fsl,sai-amix-mode", &str)) {
+		if (!strcmp(str, "bypass"))
+			val = FSL_SAI_AMIX_BYPASS;
+		else if (!strcmp(str, "audmix"))
+			val = FSL_SAI_AMIX_AUDMIX;
+		else
+			val = FSL_SAI_AMIX_NONE;
+
+		if (val < FSL_SAI_AMIX_NONE) {
+			ret = scmi_imx_misc_ctrl_set(SCMI_IMX952_CTRL_BYPASS_AUDMIX, val);
+			if (ret) {
+				dev_err_probe(dev, ret, "Error setting audmix mode\n");
+				goto err_pm_get_sync;
+			}
+		}
+	}
+
 	/*
 	 * Register platform component before registering cpu dai for there
 	 * is not defer probe for platform component in snd_soc_add_pcm_runtime().

sound/soc/fsl/fsl_sai.h

@@ -230,6 +230,10 @@
 #define FSL_SAI_DL_I2S		BIT(0)
 #define FSL_SAI_DL_PDM		BIT(1)
 
+#define FSL_SAI_AMIX_BYPASS	0
+#define FSL_SAI_AMIX_AUDMIX	1
+#define FSL_SAI_AMIX_NONE	2
+
 struct fsl_sai_soc_data {
 	bool use_imx_pcm;
 	bool use_edma;