ASoC: dmaengine_pcm: Allow passing component name via config

Merge series from Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>:

At the moment we cannot instantiate two dmaengine_pcms with the same
parent device, as the components will be named the same, leading to
conflicts.

Add 'name' field to the snd_dmaengine_pcm_config, and use that (if
defined) as the component name instead of deriving the component name
from the device.

include/sound/dmaengine_pcm.h

@@ -118,6 +118,7 @@ int snd_dmaengine_pcm_refine_runtime_hwparams(
  *   which do not use devicetree.
  * @process: Callback used to apply processing on samples transferred from/to
  *   user space.
+ * @name: Component name. If null, dev_name will be used.
  * @compat_filter_fn: Will be used as the filter function when requesting a
  *  channel for platforms which do not use devicetree. The filter parameter
  *  will be the DAI's DMA data.
@@ -143,6 +144,7 @@ struct snd_dmaengine_pcm_config {
 	int (*process)(struct snd_pcm_substream *substream,
 		       int channel, unsigned long hwoff,
 		       unsigned long bytes);
+	const char *name;
 	dma_filter_fn compat_filter_fn;
 	struct device *dma_dev;
 	const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];

sound/soc/soc-core.c

@@ -2796,11 +2796,13 @@ int snd_soc_component_initialize(struct snd_soc_component *component,
 	INIT_LIST_HEAD(&component->list);
 	mutex_init(&component->io_mutex);
 
+	if (!component->name) {
 		component->name = fmt_single_name(dev, &component->id);
 		if (!component->name) {
 			dev_err(dev, "ASoC: Failed to allocate name\n");
 			return -ENOMEM;
 		}
+	}
 
 	component->dev		= dev;
 	component->driver	= driver;

sound/soc/soc-generic-dmaengine-pcm.c

@@ -441,6 +441,9 @@ int snd_dmaengine_pcm_register(struct device *dev,
 	pcm->config = config;
 	pcm->flags = flags;
 
+	if (config->name)
+		pcm->component.name = config->name;
+
 	ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
 	if (ret)
 		goto err_free_dma;