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