From 94bdfad3a665da68731deb56b0fe80f00a3e6da8 Mon Sep 17 00:00:00 2001 From: Troy Mitchell Date: Fri, 22 May 2026 21:33:57 +0800 Subject: ASoC: soc-dai: add shared BCLK clock for cross-DAI rate constraints Add a bclk field to struct snd_soc_dai and a helper function snd_soc_dai_set_bclk_clk() that platform drivers can use to declare which clock is their BCLK. Also cache the bclk_ratio in snd_soc_dai_set_bclk_ratio() so that the framework can use it later in hw_rule evaluation for TDM configurations where BCLK = rate * slots * slot_width. When multiple DAIs on the same card share the same physical BCLK (detected via clk_is_match()), the ASoC core can automatically constrain their hw_params so that the resulting BCLK rates are compatible. This commit adds the data structure support; the actual constraint logic follows in the next patch. Signed-off-by: Troy Mitchell Link: https://patch.msgid.link/20260522-i2s-same-blk-v4-1-a71a86faaa20@linux.spacemit.com Signed-off-by: Mark Brown --- include/sound/soc-dai.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include') diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h index 6a42812bba8c..df010a91b350 100644 --- a/include/sound/soc-dai.h +++ b/include/sound/soc-dai.h @@ -17,6 +17,7 @@ struct snd_pcm_substream; struct snd_soc_dapm_widget; struct snd_compr_stream; +struct clk; /* * DAI hardware audio formats. @@ -188,6 +189,8 @@ int snd_soc_dai_set_pll(struct snd_soc_dai *dai, int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio); +void snd_soc_dai_set_bclk_clk(struct snd_soc_dai *dai, struct clk *bclk); + /* Digital Audio interface formatting */ int snd_soc_dai_get_fmt_max_priority(const struct snd_soc_pcm_runtime *rtd); u64 snd_soc_dai_get_fmt(const struct snd_soc_dai *dai, int priority); @@ -473,6 +476,10 @@ struct snd_soc_dai { unsigned int symmetric_channels; unsigned int symmetric_sample_bits; + /* shared BCLK clock for cross-DAI rate constraints */ + struct clk *bclk; + unsigned int bclk_ratio; /* BCLK = rate * bclk_ratio (0 = use channels * sample_bits) */ + /* parent platform/codec */ struct snd_soc_component *component; -- cgit v1.2.3