ASoC: mediatek: mt8192: Allow setting shared clocks from machine driver

Add a new function to configure the shared clock between two i2s ports,
and export it. This will allow the clock sharing to be set from the
machine driver instead of the devicetree.
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220908161154.648557-2-nfraprado@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8192/mt8192-afe-common.h

@@ -159,6 +159,9 @@ int mt8192_dai_src_register(struct mtk_base_afe *afe);
 int mt8192_dai_pcm_register(struct mtk_base_afe *afe);
 int mt8192_dai_tdm_register(struct mtk_base_afe *afe);
 
+int mt8192_dai_i2s_set_share(struct mtk_base_afe *afe, const char *main_i2s_name,
+			     const char *secondary_i2s_name);
+
 unsigned int mt8192_general_rate_transform(struct device *dev,
 					   unsigned int rate);
 unsigned int mt8192_rate_transform(struct device *dev,

sound/soc/mediatek/mt8192/mt8192-dai-i2s.c

@@ -2057,6 +2057,32 @@ static int mt8192_dai_i2s_get_share(struct mtk_base_afe *afe)
 	return 0;
 }
 
+/**
+ * mt8192_dai_i2s_set_share() - Set up I2S ports to share a single clock.
+ * @afe: Pointer to &struct mtk_base_afe
+ * @main_i2s_name: The name of the I2S port that will provide the clock
+ * @secondary_i2s_name: The name of the I2S port that will use this clock
+ */
+int mt8192_dai_i2s_set_share(struct mtk_base_afe *afe, const char *main_i2s_name,
+			     const char *secondary_i2s_name)
+{
+	struct mtk_afe_i2s_priv *secondary_i2s_priv;
+	int main_i2s_id;
+
+	secondary_i2s_priv = get_i2s_priv_by_name(afe, secondary_i2s_name);
+	if (!secondary_i2s_priv)
+		return -EINVAL;
+
+	main_i2s_id = get_i2s_id_by_name(afe, main_i2s_name);
+	if (main_i2s_id < 0)
+		return main_i2s_id;
+
+	secondary_i2s_priv->share_i2s_id = main_i2s_id;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt8192_dai_i2s_set_share);
+
 static int mt8192_dai_i2s_set_priv(struct mtk_base_afe *afe)
 {
 	int i;