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| author | Richard Fitzgerald <rf@opensource.cirrus.com> | 2022-02-28 17:27:54 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-03-07 13:12:58 +0000 |
| commit | 1e974e5b82b3d75069b50445cd248cee0199654e (patch) | |
| tree | 86b9ef425eaf26b4793ffa1180fb0f5098352717 /include/sound/simple_card_utils.h | |
| parent | 26e5366dd30569a469e1a87998b866b814deccf8 (diff) | |
| download | lwn-1e974e5b82b3d75069b50445cd248cee0199654e.tar.gz lwn-1e974e5b82b3d75069b50445cd248cee0199654e.zip | |
ASoC: audio_graph_card2: Add support for variable slot widths
Some audio hardware cannot support the same slot width for all sample
widths, or a slot width equal to the sample width for all sample widths.
This is usually due either to limitations of the audio serial port or
system clocking restrictions.
A typical example would be:
- 16-bit samples in 16-bit slots
- 24-bit samples in 32-bit slots
The new dai-tdm-slot-width-map property allows setting a mapping of
sample widths and the corresponding tdm slot widths and slot counts.
Although the slot count is usually the same for all cases this does
allow for adding padding slots to maintain the same bitclk frequency.
The property is added to each endpoint node that needs the component
DAI to be told the TDM slot width and count.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220228172754.453783-3-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound/simple_card_utils.h')
| -rw-r--r-- | include/sound/simple_card_utils.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h index 5ee269c59aac..8faa649f712b 100644 --- a/include/sound/simple_card_utils.h +++ b/include/sound/simple_card_utils.h @@ -16,6 +16,12 @@ #define asoc_simple_init_mic(card, sjack, prefix) \ asoc_simple_init_jack(card, sjack, 0, prefix, NULL) +struct asoc_simple_tdm_width_map { + u8 sample_bits; + u8 slot_count; + u16 slot_width; +}; + struct asoc_simple_dai { const char *name; unsigned int sysclk; @@ -26,6 +32,8 @@ struct asoc_simple_dai { unsigned int rx_slot_mask; struct clk *clk; bool clk_fixed; + struct asoc_simple_tdm_width_map *tdm_width_map; + int n_tdm_widths; }; struct asoc_simple_data { @@ -132,6 +140,9 @@ int asoc_simple_parse_daifmt(struct device *dev, struct device_node *codec, char *prefix, unsigned int *retfmt); +int asoc_simple_parse_tdm_width_map(struct device *dev, struct device_node *np, + struct asoc_simple_dai *dai); + __printf(3, 4) int asoc_simple_set_dailink_name(struct device *dev, struct snd_soc_dai_link *dai_link, |