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ASoC: fsl_sai: Add RX/TX BCLK swap support

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Add support for setting the Bit Clock Swap bit in CR2 register
via new "fsl,sai-bit-clock-swap" DT property. This bit swaps the
bit clock used by the transmitter or receiver in asynchronous mode,
i.e. makes transmitter use RX_BCLK and TX_SYNC, and vice versa,
makes receiver use TX_BCLK and RX_SYNC.

Signed-off-by: Marek Vasut <marex@nabladev.com>
Link: https://patch.msgid.link/20260404183547.46509-2-marex@nabladev.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marek Vasut 2026-04-04 20:35:01 +02:00 committed by Mark Brown
parent 9897a97766
commit dc06cf4268
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 8 additions and 1 deletions
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7
sound/soc/fsl/fsl_sai.c
View File

@ -355,6 +355,9 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
unsigned int ofs = sai->soc_data->reg_offset;
u32 val_cr2 = 0, val_cr4 = 0;
if (sai->is_bit_clock_swap)
val_cr2 |= FSL_SAI_CR2_BCS;
if (!sai->is_lsb_first)
val_cr4 |= FSL_SAI_CR4_MF;
@ -453,7 +456,8 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
}
regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
FSL_SAI_CR2_BCS | FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR,
val_cr2);
regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);
@ -1507,6 +1511,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
sai->soc_data = of_device_get_match_data(dev);
sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
sai->is_bit_clock_swap = of_property_read_bool(np, "fsl,sai-bit-clock-swap");
base = devm_platform_get_and_ioremap_resource(pdev, 0, &sai->res);
if (IS_ERR(base))

2
sound/soc/fsl/fsl_sai.h
View File

@ -118,6 +118,7 @@
/* SAI Transmit and Receive Configuration 2 Register */
#define FSL_SAI_CR2_SYNC BIT(30)
#define FSL_SAI_CR2_BCS BIT(29)
#define FSL_SAI_CR2_BCI BIT(28)
#define FSL_SAI_CR2_MSEL_MASK (0x3 << 26)
#define FSL_SAI_CR2_MSEL_BUS 0
@ -301,6 +302,7 @@ struct fsl_sai {
struct fsl_sai_dl_cfg *dl_cfg;
unsigned int dl_cfg_cnt;
bool mclk_direction_output;
bool is_bit_clock_swap;
unsigned int mclk_id[2];
unsigned int mclk_streams;