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);