ASoC: sun8i-codec: Support the TDM slot binding

Now that BCLK and LRCK rate calculations in the driver can handle any
hardware-supported slot width and number of slots, allow overriding
those parameters from the device tree.
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20201014061941.4306-8-samuel@sholland.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sunxi/sun8i-codec.c

@@ -99,6 +99,11 @@ enum {
 	SUN8I_CODEC_NAIFS
 };
 
+struct sun8i_codec_aif {
+	unsigned int	slots;
+	unsigned int	slot_width;
+};
+
 struct sun8i_codec_quirks {
 	bool legacy_widgets	: 1;
 	bool lrck_inversion	: 1;
@@ -108,6 +113,7 @@ struct sun8i_codec {
 	struct regmap			*regmap;
 	struct clk			*clk_module;
 	const struct sun8i_codec_quirks	*quirks;
+	struct sun8i_codec_aif		aifs[SUN8I_CODEC_NAIFS];
 };
 
 static int sun8i_codec_runtime_resume(struct device *dev)
@@ -261,6 +267,22 @@ static int sun8i_codec_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	return 0;
 }
 
+static int sun8i_codec_set_tdm_slot(struct snd_soc_dai *dai,
+				    unsigned int tx_mask, unsigned int rx_mask,
+				    int slots, int slot_width)
+{
+	struct sun8i_codec *scodec = snd_soc_dai_get_drvdata(dai);
+	struct sun8i_codec_aif *aif = &scodec->aifs[dai->id];
+
+	if (slot_width && !is_power_of_2(slot_width))
+		return -EINVAL;
+
+	aif->slots = slots;
+	aif->slot_width = slot_width;
+
+	return 0;
+}
+
 struct sun8i_codec_clk_div {
 	u8	div;
 	u8	val;
@@ -321,8 +343,9 @@ static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_soc_dai *dai)
 {
 	struct sun8i_codec *scodec = snd_soc_dai_get_drvdata(dai);
-	unsigned int slots = params_channels(params);
-	unsigned int slot_width = params_width(params);
+	struct sun8i_codec_aif *aif = &scodec->aifs[dai->id];
+	unsigned int slots = aif->slots ?: params_channels(params);
+	unsigned int slot_width = aif->slot_width ?: params_width(params);
 	int lrck_div_order, sample_rate, word_size;
 	u8 bclk_div;
 
@@ -376,6 +399,7 @@ static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 
 static const struct snd_soc_dai_ops sun8i_codec_dai_ops = {
 	.set_fmt	= sun8i_codec_set_fmt,
+	.set_tdm_slot	= sun8i_codec_set_tdm_slot,
 	.hw_params	= sun8i_codec_hw_params,
 };