ASoC: SOF: remove superfluous parent device pointers of snd_sof_pdata

We had pointers for parent device of snd_sof_pdata, pci for pci_dev,
pdev for platform_device, and spi for spi_device (intended to but not
added yet). All of these can be retrieved from parent dev via
container_of(), so they are actually superfluous.

Here remove these pointers to kinds of parent devices, add an enum
sof_device_type and simplify the initialization of snd_sof_dev->parent
correspondingly.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

Author: keyonjie

include/sound/sof.h

@@ -23,6 +23,13 @@
 
 struct snd_sof_dsp_ops;
 
+/* SOF probe type */
+enum sof_device_type {
+	SOF_DEVICE_PCI = 0,
+	SOF_DEVICE_APCI,
+	SOF_DEVICE_SPI
+};
+
 /*
  * SOF Platform data.
  */
@@ -32,10 +39,9 @@ struct snd_sof_pdata {
 	const char *drv_name;
 	const char *name;
 
-	/* parent devices */
+	/* parent device */
 	struct device *dev;
-	struct pci_dev *pci;
-	struct platform_device *pdev;
+	enum sof_device_type type;
 
 	/* descriptor */
 	const struct sof_dev_desc *desc;

sound/soc/sof/core.c

@@ -239,14 +239,9 @@ static int sof_probe(struct platform_device *pdev)
 
 	/* initialize sof device */
 	sdev->dev = &pdev->dev;
-	if (plat_data->pci) {
-		sdev->pci = plat_data->pci;
-		sdev->parent = &plat_data->pci->dev;
-	} else if (plat_data->pdev) {
-		sdev->parent = &plat_data->pdev->dev;
-	} else {
-		sdev->parent = plat_data->dev;
-	}
+	sdev->parent = plat_data->dev;
+	if (plat_data->type == SOF_DEVICE_PCI)
+		sdev->pci = container_of(plat_data->dev, struct pci_dev, dev);
 	sdev->ops = plat_data->machine->pdata;
 
 	sdev->pdata = plat_data;

sound/soc/sof/sof-acpi-dev.c

@@ -121,7 +121,7 @@ static struct platform_device *
 	mfld_new_mach_data(struct snd_sof_pdata *sof_pdata)
 {
 	struct snd_soc_acpi_mach pmach;
-	struct device *dev = &sof_pdata->pdev->dev;
+	struct device *dev = sof_pdata->dev;
 	const struct snd_soc_acpi_mach *mach = sof_pdata->machine;
 	struct platform_device *pdev = NULL;
 
@@ -139,7 +139,7 @@ static void sof_acpi_fw_cb(const struct firmware *fw, void *context)
 	struct sof_platform_priv *priv = context;
 	struct snd_sof_pdata *sof_pdata = priv->sof_pdata;
 	const struct snd_soc_acpi_mach *mach = sof_pdata->machine;
-	struct device *dev = &sof_pdata->pdev->dev;
+	struct device *dev = sof_pdata->dev;
 
 	sof_pdata->fw = fw;
 	if (!fw) {
@@ -273,7 +273,8 @@ static int sof_acpi_probe(struct platform_device *pdev)
 	 */
 	sof_pdata->desc = desc;
 	priv->sof_pdata = sof_pdata;
-	sof_pdata->pdev = pdev;
+	sof_pdata->dev = &pdev->dev;
+	sof_pdata->type = SOF_DEVICE_APCI;
 	dev_set_drvdata(&pdev->dev, priv);
 
 	/* do we need to generate any machine plat data ? */

sound/soc/sof/sof-pci-dev.c

@@ -251,8 +251,8 @@ static int sof_pci_probe(struct pci_dev *pci,
 	sof_pdata->machine = mach;
 	sof_pdata->desc = (struct sof_dev_desc *)pci_id->driver_data;
 	priv->sof_pdata = sof_pdata;
-	sof_pdata->pci = pci;
 	sof_pdata->dev = &pci->dev;
+	sof_pdata->type = SOF_DEVICE_PCI;
 
 	/* register machine driver */
 	sof_pdata->pdev_mach =

sound/soc/sof/sof-spi-dev.c

@@ -89,8 +89,8 @@ static int sof_spi_probe(struct spi_device *spi)
 	sof_pdata->machine = mach;
 	sof_pdata->desc = (struct sof_dev_desc *)pci_id->driver_data;
 	priv->sof_pdata = sof_pdata;
-	sof_pdata->spi = spi;
 	sof_pdata->dev = dev;
+	sof_pdata->type = SOF_DEVICE_SPI;
 
 	/* register machine driver */
 	sof_pdata->pdev_mach =