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Commit a4a54dd5 authored by Stephen Warren's avatar Stephen Warren Committed by Mark Brown
Browse files

ASoC: Add utility to parse DAPM routes from device tree 



Implement snd_soc_of_parse_audio_routing(), a utility function that can
parses a simple DAPM route table from device tree.The machine driver
specifies the DT property to use, since this is binding-specific.

Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent bec4fa05

include/sound/soc.h

+2 −0
Original line number Diff line number Diff line
@@ -963,6 +963,8 @@ void snd_soc_util_exit(void); 


int snd_soc_of_parse_card_name(struct snd_soc_card *card,

			       const char *propname);

int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,

				   const char *propname);



#include <sound/soc-dai.h>

sound/soc/soc-core.c

+57 −0
Original line number Diff line number Diff line
@@ -3342,6 +3342,63 @@ int snd_soc_of_parse_card_name(struct snd_soc_card *card, 
}

EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);



int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,

				   const char *propname)

{

	struct device_node *np = card->dev->of_node;

	int num_routes;

	struct snd_soc_dapm_route *routes;

	int i, ret;



	num_routes = of_property_count_strings(np, propname);

	if (num_routes & 1) {

		dev_err(card->dev,

			"Property '%s's length is not even\n",

			propname);

		return -EINVAL;

	}

	num_routes /= 2;

	if (!num_routes) {

		dev_err(card->dev,

			"Property '%s's length is zero\n",

			propname);

		return -EINVAL;

	}



	routes = devm_kzalloc(card->dev, num_routes * sizeof(*routes),

			      GFP_KERNEL);

	if (!routes) {

		dev_err(card->dev,

			"Could not allocate DAPM route table\n");

		return -EINVAL;

	}



	for (i = 0; i < num_routes; i++) {

		ret = of_property_read_string_index(np, propname,

			2 * i, &routes[i].sink);

		if (ret) {

			dev_err(card->dev,

				"Property '%s' index %d could not be read: %d\n",

				propname, 2 * i, ret);

			return -EINVAL;

		}

		ret = of_property_read_string_index(np, propname,

			(2 * i) + 1, &routes[i].source);

		if (ret) {

			dev_err(card->dev,

				"Property '%s' index %d could not be read: %d\n",

				propname, (2 * i) + 1, ret);

			return -EINVAL;

		}

	}



	card->num_dapm_routes = num_routes;

	card->dapm_routes = routes;



	return 0;

}

EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);



static int __init snd_soc_init(void)

{

#ifdef CONFIG_DEBUG_FS