[PATCH 4/7] ASoC: mchp-i2s-mcc: Add multi-channel support for I2S and LEFT_J formats

[Codrin Ciubotariu]

The latest I2S-MCC available in SAMA7G5 supports multi-channel for I2S and
Left-Justified formats. For this, the new version uses 8 (4 * 2) input and
output pins, with each pin being responsible for 2 channels. This sums up
to a total of 8 channels for synchronous capture and playback.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu at microchip.com>
---
 sound/soc/atmel/mchp-i2s-mcc.c | 38 ++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/sound/soc/atmel/mchp-i2s-mcc.c b/sound/soc/atmel/mchp-i2s-mcc.c
index 0ee01383e307..52d3f43148dc 100644
--- a/sound/soc/atmel/mchp-i2s-mcc.c
+++ b/sound/soc/atmel/mchp-i2s-mcc.c
@@ -16,6 +16,7 @@
 #include <linux/clk.h>
 #include <linux/mfd/syscon.h>
 #include <linux/lcm.h>
+#include <linux/of_device.h>
 
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -225,6 +226,10 @@ static const struct regmap_config mchp_i2s_mcc_regmap_config = {
 	.max_register = MCHP_I2SMCC_VERSION,
 };
 
+struct mchp_i2s_mcc_soc_data {
+	unsigned int	data_pin_pair_num;
+};
+
 struct mchp_i2s_mcc_dev {
 	struct wait_queue_head			wq_txrdy;
 	struct wait_queue_head			wq_rxrdy;
@@ -232,6 +237,7 @@ struct mchp_i2s_mcc_dev {
 	struct regmap				*regmap;
 	struct clk				*pclk;
 	struct clk				*gclk;
+	const struct mchp_i2s_mcc_soc_data	*soc;
 	struct snd_dmaengine_dai_dma_data	playback;
 	struct snd_dmaengine_dai_dma_data	capture;
 	unsigned int				fmt;
@@ -549,6 +555,17 @@ static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	if (dev->fmt & (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J)) {
+		/* for I2S and LEFT_J one pin is needed for every 2 channels */
+		if (channels > dev->soc->data_pin_pair_num * 2) {
+			dev_err(dev->dev,
+				"unsupported number of audio channels: %d\n",
+				channels);
+			return -EINVAL;
+		}
+
+		/* enable for interleaved format */
+		mrb |= MCHP_I2SMCC_MRB_CRAMODE_REGULAR;
+
 		switch (channels) {
 		case 1:
 			if (is_playback)
@@ -558,6 +575,12 @@ static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
 			break;
 		case 2:
 			break;
+		case 4:
+			mra |= MCHP_I2SMCC_MRA_WIRECFG_I2S_2_TDM_1;
+			break;
+		case 8:
+			mra |= MCHP_I2SMCC_MRA_WIRECFG_I2S_4_TDM_2;
+			break;
 		default:
 			dev_err(dev->dev, "unsupported number of audio channels\n");
 			return -EINVAL;
@@ -869,12 +892,22 @@ static const struct snd_soc_component_driver mchp_i2s_mcc_component = {
 };
 
 #ifdef CONFIG_OF
+static struct mchp_i2s_mcc_soc_data mchp_i2s_mcc_sam9x60 = {
+	.data_pin_pair_num = 1,
+};
+
+static struct mchp_i2s_mcc_soc_data mchp_i2s_mcc_sama7g5 = {
+	.data_pin_pair_num = 4,
+};
+
 static const struct of_device_id mchp_i2s_mcc_dt_ids[] = {
 	{
 		.compatible = "microchip,sam9x60-i2smcc",
+		.data = &mchp_i2s_mcc_sam9x60,
 	},
 	{
 		.compatible = "microchip,sama7g5-i2smcc",
+		.data = &mchp_i2s_mcc_sama7g5,
 	},
 	{ /* sentinel */ }
 };
@@ -932,6 +965,11 @@ static int mchp_i2s_mcc_probe(struct platform_device *pdev)
 		dev->gclk = NULL;
 	}
 
+	dev->soc = of_device_get_match_data(&pdev->dev);
+	if (!dev->soc) {
+		dev_err(&pdev->dev, "failed to get soc data\n");
+		return -ENODEV;
+	}
 	dev->dev = &pdev->dev;
 	dev->regmap = regmap;
 	platform_set_drvdata(pdev, dev);
-- 
2.27.0