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Message-Id: <20251006-topic-sm8x50-next-hdk-i2s-v1-3-184b15a87e0a@linaro.org>
Date: Mon, 06 Oct 2025 20:37:16 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Srinivas Kandagatla <srini@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH RFC 3/6] ASoC: soc: qcom: sc8280xp: add support for I2S
clocks
Add support for getting the I2S clocks used for the MI2S
interfaces, and enable/disable the clocks on the PCM
startup and shutdown card callbacks.
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
sound/soc/qcom/sc8280xp.c | 104 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 103 insertions(+), 1 deletion(-)
diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
index 78e327bc2f07767b1032f09af7f45b947e7eb67a..ad4ee5c6fab8994f18de572842f3dab6f4f5397e 100644
--- a/sound/soc/qcom/sc8280xp.c
+++ b/sound/soc/qcom/sc8280xp.c
@@ -4,6 +4,8 @@
#include <dt-bindings/sound/qcom,q6afe.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/of_clk.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/pcm.h>
@@ -15,12 +17,16 @@
#include "common.h"
#include "sdw.h"
+#define I2S_MAX_CLKS 5
+
struct sc8280xp_snd_data {
bool stream_prepared[AFE_PORT_MAX];
struct snd_soc_card *card;
struct sdw_stream_runtime *sruntime[AFE_PORT_MAX];
struct snd_soc_jack jack;
struct snd_soc_jack dp_jack[8];
+ struct clk *i2s_clk[I2S_MAX_CLKS];
+ struct clk *i2s_mclk[I2S_MAX_CLKS];
bool jack_setup;
};
@@ -68,12 +74,66 @@ static int sc8280xp_snd_init(struct snd_soc_pcm_runtime *rtd)
return qcom_snd_wcd_jack_setup(rtd, &data->jack, &data->jack_setup);
}
+static int sc8280xp_snd_i2s_index(struct snd_soc_dai *dai)
+{
+ switch (dai->id) {
+ case PRIMARY_MI2S_RX..PRIMARY_MI2S_TX:
+ return 0;
+ case SECONDARY_MI2S_RX.. SECONDARY_MI2S_TX:
+ return 1;
+ case TERTIARY_MI2S_RX..TERTIARY_MI2S_TX:
+ return 2;
+ case QUATERNARY_MI2S_RX..QUATERNARY_MI2S_TX:
+ return 3;
+ case QUINARY_MI2S_RX..QUINARY_MI2S_TX:
+ return 4;
+ default:
+ return -1;
+ }
+}
+
+static int sc8280xp_snd_startup(struct snd_pcm_substream *substream)
+{
+ unsigned int codec_dai_fmt = SND_SOC_DAIFMT_BC_FC | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_I2S;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct sc8280xp_snd_data *pdata = snd_soc_card_get_drvdata(rtd->card);
+ struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+ struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
+ int index;
+
+ switch (cpu_dai->id) {
+ case PRIMARY_MI2S_RX...QUATERNARY_MI2S_TX:
+ case QUINARY_MI2S_RX...QUINARY_MI2S_TX:
+ index = sc8280xp_snd_i2s_index(cpu_dai);
+ clk_enable(pdata->i2s_mclk[index]);
+ clk_enable(pdata->i2s_clk[index]);
+ snd_soc_dai_set_fmt(codec_dai, codec_dai_fmt);
+ break;
+ default:
+ break;
+ }
+
+ return qcom_snd_sdw_startup(substream);
+}
+
static void sc8280xp_snd_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
struct sc8280xp_snd_data *pdata = snd_soc_card_get_drvdata(rtd->card);
struct sdw_stream_runtime *sruntime = pdata->sruntime[cpu_dai->id];
+ int index;
+
+ switch (cpu_dai->id) {
+ case PRIMARY_MI2S_RX..TERTIARY_MI2S_RX:
+ case QUINARY_MI2S_RX...QUINARY_MI2S_TX:
+ index = sc8280xp_snd_i2s_index(cpu_dai);
+ clk_disable(pdata->i2s_clk[index]);
+ clk_disable(pdata->i2s_mclk[index]);
+ break;
+ default:
+ break;
+ }
pdata->sruntime[cpu_dai->id] = NULL;
sdw_release_stream(sruntime);
@@ -141,7 +201,7 @@ static int sc8280xp_snd_hw_free(struct snd_pcm_substream *substream)
}
static const struct snd_soc_ops sc8280xp_be_ops = {
- .startup = qcom_snd_sdw_startup,
+ .startup = sc8280xp_snd_startup,
.shutdown = sc8280xp_snd_shutdown,
.hw_params = sc8280xp_snd_hw_params,
.hw_free = sc8280xp_snd_hw_free,
@@ -162,6 +222,44 @@ static void sc8280xp_add_be_ops(struct snd_soc_card *card)
}
}
+static const char * const i2s_bus_names[I2S_MAX_CLKS] = {
+ "primary",
+ "secondary",
+ "tertiary",
+ "quaternary",
+ "quinary",
+};
+
+static int sc8280xp_get_i2c_clocks(struct platform_device *pdev,
+ struct sc8280xp_snd_data *data)
+{
+ struct device *dev = &pdev->dev;
+ int i;
+
+ if (!device_property_present(dev))
+ return 0;
+
+ for (i = 0; i < I2S_MAX_CLKS; ++i) {
+ char name[16];
+
+ snprintf(name, 16, "%s-mi2s", i2s_bus_names, i);
+ data->i2s_clk[i] = devm_clk_get_optional_prepared(dev, name);
+ if (IS_ERR(data->i2s_clk[i]))
+ return dev_err_probe(dev, PTR_ERR(data->i2s_clk[i]),
+ "unable to get %s clock\n",
+ name);
+
+ snprintf(name, 16, "%s-mclk", i2s_bus_names, i);
+ data->i2s_mclk[i] = devm_clk_get_optional_prepared(dev, name);
+ if (IS_ERR(data->i2s_mclk[i]))
+ return dev_err_probe(dev, PTR_ERR(data->i2s_mclk[i]),
+ "unable to get %s clock\n",
+ name);
+ }
+
+ return 0;
+}
+
static int sc8280xp_platform_probe(struct platform_device *pdev)
{
struct snd_soc_card *card;
@@ -185,6 +283,10 @@ static int sc8280xp_platform_probe(struct platform_device *pdev)
if (ret)
return ret;
+ ret = sc8280xp_get_i2c_clocks(pdev, data);
+ if (ret)
+ return ret;
+
card->driver_name = of_device_get_match_data(dev);
sc8280xp_add_be_ops(card);
return devm_snd_soc_register_card(dev, card);
--
2.34.1
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