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ASoC: mchp-i2s-mcc: Add support to select TDM pins

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SAMA7G5's I2S-MCC has 4 pairs of DIN/DOUT pins. Since TDM only uses a
single pair of pins for synchronous capture and playback, the controller
needs to be told which of the pair is connected. This can be mentioned
using the "microchip,tdm-data-pair" property from DT. The property is
optional, useful only if TDM is used. If it's missing, DIN/DOUT 0 pins
will be used by default.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20210301170905.835091-6-codrin.ciubotariu@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Codrin Ciubotariu 2021-03-01 19:09:03 +02:00 committed by Mark Brown
parent 13c1629d75
commit bfdca48975
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 48 additions and 4 deletions
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52
sound/soc/atmel/mchp-i2s-mcc.c
View File

@ -100,6 +100,8 @@
#define MCHP_I2SMCC_MRA_DATALENGTH_8_BITS_COMPACT (7 << 1)
#define MCHP_I2SMCC_MRA_WIRECFG_MASK GENMASK(5, 4)
#define MCHP_I2SMCC_MRA_WIRECFG_TDM(pin) (((pin) << 4) & \
MCHP_I2SMCC_MRA_WIRECFG_MASK)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_1_TDM_0 (0 << 4)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_2_TDM_1 (1 << 4)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_4_TDM_2 (2 << 4)
@ -245,6 +247,7 @@ struct mchp_i2s_mcc_dev {
unsigned int frame_length;
int tdm_slots;
int channels;
u8 tdm_data_pair;
unsigned int gclk_use:1;
unsigned int gclk_running:1;
unsigned int tx_rdy:1;
@ -589,6 +592,8 @@ static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
if (!frame_length)
frame_length = 2 * params_physical_width(params);
} else if (dev->fmt & SND_SOC_DAIFMT_DSP_A) {
mra |= MCHP_I2SMCC_MRA_WIRECFG_TDM(dev->tdm_data_pair);
if (dev->tdm_slots) {
if (channels % 2 && channels * 2 <= dev->tdm_slots) {
/*
@ -914,6 +919,45 @@ static const struct of_device_id mchp_i2s_mcc_dt_ids[] = {
MODULE_DEVICE_TABLE(of, mchp_i2s_mcc_dt_ids);
#endif
static int mchp_i2s_mcc_soc_data_parse(struct platform_device *pdev,
struct mchp_i2s_mcc_dev *dev)
{
int err;
if (!dev->soc) {
dev_err(&pdev->dev, "failed to get soc data\n");
return -ENODEV;
}
if (dev->soc->data_pin_pair_num == 1)
return 0;
err = of_property_read_u8(pdev->dev.of_node, "microchip,tdm-data-pair",
&dev->tdm_data_pair);
if (err < 0 && err != -EINVAL) {
dev_err(&pdev->dev,
"bad property data for 'microchip,tdm-data-pair': %d",
err);
return err;
}
if (err == -EINVAL) {
dev_info(&pdev->dev,
"'microchip,tdm-data-pair' not found; assuming DIN/DOUT 0 for TDM\n");
dev->tdm_data_pair = 0;
} else {
if (dev->tdm_data_pair > dev->soc->data_pin_pair_num - 1) {
dev_err(&pdev->dev,
"invalid value for 'microchip,tdm-data-pair': %d\n",
dev->tdm_data_pair);
return -EINVAL;
}
dev_dbg(&pdev->dev, "TMD format on DIN/DOUT %d pins\n",
dev->tdm_data_pair);
}
return 0;
}
static int mchp_i2s_mcc_probe(struct platform_device *pdev)
{
struct mchp_i2s_mcc_dev *dev;
@ -966,10 +1010,10 @@ static int mchp_i2s_mcc_probe(struct platform_device *pdev)
}
dev->soc = of_device_get_match_data(&pdev->dev);
if (!dev->soc) {
dev_err(&pdev->dev, "failed to get soc data\n");
return -ENODEV;
}
err = mchp_i2s_mcc_soc_data_parse(pdev, dev);
if (err < 0)
return err;
dev->dev = &pdev->dev;
dev->regmap = regmap;
platform_set_drvdata(pdev, dev);