LF-537-1 ASoC: SOF: Introduce machine driver name

ACPI creates tables with information about the machine driver.
With DT there is no need for such tables because we can directly
get all the information needed from DT file.

This patch introduces machine driver property inside dsp node.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

include/sound/sof.h

@@ -48,6 +48,7 @@ struct snd_sof_pdata {
 	/* machine */
 	struct platform_device *pdev_mach;
 	const struct snd_soc_acpi_mach *machine;
+	const char *machine_drv_name; /* machine driver name, set only for OF case */
 
 	void *hw_pdata;
 };

sound/soc/sof/pcm.c

@@ -756,7 +756,7 @@ void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
 	if (plat_data->machine)
 		drv_name = plat_data->machine->drv_name;
 	else
-		drv_name = "asoc-simple-card";
+		drv_name = plat_data->machine_drv_name;
 
 	pd->name = "sof-audio-component";
 	pd->probe = sof_pcm_probe;

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

@@ -54,6 +54,11 @@ int sof_of_parse(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	ret = of_property_read_string(np, "machine-drv-name",
+				      &sof_pdata->machine_drv_name);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }