[PATCH v2 07/17] ASoC: sun8i-codec: Support the TDM slot binding

[Samuel Holland]

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 at kernel.org>
Signed-off-by: Samuel Holland <samuel at sholland.org>
---
 sound/soc/sunxi/sun8i-codec.c | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index ae885774c877..49e763d1891b 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -94,25 +94,31 @@
 #define SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ_MASK	GENMASK(5, 4)
 #define SUN8I_AIF1CLK_CTRL_AIF1_DATA_FMT_MASK	GENMASK(3, 2)
 
 enum {
 	SUN8I_CODEC_AIF1,
 	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;
 };
 
 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)
 {
 	struct sun8i_codec *scodec = dev_get_drvdata(dev);
 	int ret;
 
 	regcache_cache_only(scodec->regmap, false);
@@ -256,16 +262,32 @@ static int sun8i_codec_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 
 	regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
 			   SUN8I_AIF1CLK_CTRL_AIF1_CLK_INV_MASK,
 			   invert << SUN8I_AIF1CLK_CTRL_AIF1_CLK_INV);
 
 	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;
 };
 
 static const struct sun8i_codec_clk_div sun8i_codec_bclk_div[] = {
 	{ .div = 1,	.val = 0 },
 	{ .div = 2,	.val = 1 },
@@ -316,18 +338,19 @@ static int sun8i_codec_get_lrck_div_order(unsigned int slots,
 	return order_base_2(div);
 }
 
 static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 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;
 
 	/* word size */
 	switch (params_width(params)) {
 	case 8:
 		word_size = 0x0;
 		break;
@@ -371,16 +394,17 @@ static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 			   SUN8I_SYS_SR_CTRL_AIF1_FS_MASK,
 			   sample_rate << SUN8I_SYS_SR_CTRL_AIF1_FS);
 
 	return 0;
 }
 
 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,
 };
 
 static struct snd_soc_dai_driver sun8i_codec_dais[] = {
 	{
 		.name	= "sun8i-codec-aif1",
 		.id	= SUN8I_CODEC_AIF1,
 		.ops	= &sun8i_codec_dai_ops,
-- 
2.26.2