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Subject[PATCH 6/7] ASoC: mchp-i2s-mcc: Add support to select TDM pins
Date
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>
---
sound/soc/atmel/mchp-i2s-mcc.c | 52 +++++++++++++++++++++++++++++++---
1 file changed, 48 insertions(+), 4 deletions(-)

diff --git a/sound/soc/atmel/mchp-i2s-mcc.c b/sound/soc/atmel/mchp-i2s-mcc.c
index 52d3f43148dc..3d13efb11444 100644
--- a/sound/soc/atmel/mchp-i2s-mcc.c
+++ b/sound/soc/atmel/mchp-i2s-mcc.c
@@ -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);
--
2.27.0
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