ASoC: meson: Use snd_soc_of_parse_aux_devs()

Use the new common snd_soc_of_parse_aux_devs() helper function
to parse auxiliary devices from the device tree. The new helper
is just a copy of meson_card_add_aux_devices() so there is no
functional change.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200801100257.22658-3-stephan@gerhold.netSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/meson/meson-card-utils.c

@@ -254,37 +254,6 @@ static int meson_card_parse_of_optional(struct snd_soc_card *card,
 	return func(card, propname);
 }
 
-static int meson_card_add_aux_devices(struct snd_soc_card *card)
-{
-	struct device_node *node = card->dev->of_node;
-	struct snd_soc_aux_dev *aux;
-	int num, i;
-
-	num = of_count_phandle_with_args(node, "audio-aux-devs", NULL);
-	if (num == -ENOENT) {
-		return 0;
-	} else if (num < 0) {
-		dev_err(card->dev, "error getting auxiliary devices: %d\n",
-			num);
-		return num;
-	}
-
-	aux = devm_kcalloc(card->dev, num, sizeof(*aux), GFP_KERNEL);
-	if (!aux)
-		return -ENOMEM;
-	card->aux_dev = aux;
-	card->num_aux_devs = num;
-
-	for_each_card_pre_auxs(card, i, aux) {
-		aux->dlc.of_node =
-			of_parse_phandle(node, "audio-aux-devs", i);
-		if (!aux->dlc.of_node)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
 static void meson_card_clean_references(struct meson_card *priv)
 {
 	struct snd_soc_card *card = &priv->card;
@@ -357,7 +326,7 @@ int meson_card_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_err;
 
-	ret = meson_card_add_aux_devices(&priv->card);
+	ret = snd_soc_of_parse_aux_devs(&priv->card, "audio-aux-devs");
 	if (ret)
 		goto out_err;