[PATCH v2 2/2] ASoC: spacemit: add K3 SoC support with additional clocks

[Troy Mitchell]

Add support for the SpacemiT K3 SoC I2S controller, which shares the
same IP as K1 but requires additional clocks: sysclk_div, c_sysclk,
and c_bclk. These clocks only exist on K3 and are not present on K1.
The sysclk_div clock is present on most K3 I2S controllers except I2S1.
The c_sysclk and c_bclk clocks are shared across multiple I2S
controllers on K3.

Use devm_clk_get_optional_enabled() to acquire these clocks so that
the driver works on both K1 (where they are absent) and K3 without
needing SoC-specific match data. For K3, the sysclk_div rate is set
before sysclk in set_sysclk, and the common clock rates are configured
in hw_params based on the sample rate.

Signed-off-by: Troy Mitchell <troy.mitchell at linux.spacemit.com>
---
 sound/soc/spacemit/k1_i2s.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/sound/soc/spacemit/k1_i2s.c b/sound/soc/spacemit/k1_i2s.c
index 1cb99f1abc7c..4e655d714623 100644
--- a/sound/soc/spacemit/k1_i2s.c
+++ b/sound/soc/spacemit/k1_i2s.c
@@ -53,6 +53,9 @@ struct spacemit_i2s_dev {
 	struct clk *sysclk;
 	struct clk *bclk;
 	struct clk *sspa_clk;
+	struct clk *sysclk_div;
+	struct clk *c_sysclk;
+	struct clk *c_bclk;
 
 	struct snd_dmaengine_dai_dma_data capture_dma_data;
 	struct snd_dmaengine_dai_dma_data playback_dma_data;
@@ -189,6 +192,14 @@ static int spacemit_i2s_hw_params(struct snd_pcm_substream *substream,
 		    params_rate(params) *
 		    data_bits;
 
+	ret = clk_set_rate(i2s->c_sysclk, bclk_rate * 2);
+	if (ret)
+		return ret;
+
+	ret = clk_set_rate(i2s->c_bclk, bclk_rate);
+	if (ret)
+		return ret;
+
 	ret = clk_set_rate(i2s->bclk, bclk_rate);
 	if (ret)
 		return ret;
@@ -200,10 +211,17 @@ static int spacemit_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
 				   unsigned int freq, int dir)
 {
 	struct spacemit_i2s_dev *i2s = dev_get_drvdata(cpu_dai->dev);
+	int ret;
 
 	if (freq == 0)
 		return 0;
 
+	if (i2s->sysclk_div) {
+		ret = clk_set_rate(i2s->sysclk_div, freq);
+		if (ret)
+			return ret;
+	}
+
 	return clk_set_rate(i2s->sysclk, freq);
 }
 
@@ -418,6 +436,21 @@ static int spacemit_i2s_probe(struct platform_device *pdev)
 		return dev_err_probe(i2s->dev, PTR_ERR(i2s->sspa_clk),
 				     "failed to enable sspa clock\n");
 
+	i2s->sysclk_div = devm_clk_get_optional_enabled(i2s->dev, "sysclk_div");
+	if (IS_ERR(i2s->sysclk_div))
+		return dev_err_probe(i2s->dev, PTR_ERR(i2s->sysclk_div),
+				     "failed to enable sysclk_div clock\n");
+
+	i2s->c_sysclk = devm_clk_get_optional_enabled(i2s->dev, "c_sysclk");
+	if (IS_ERR(i2s->c_sysclk))
+		return dev_err_probe(i2s->dev, PTR_ERR(i2s->c_sysclk),
+				     "failed to enable c_sysclk clock\n");
+
+	i2s->c_bclk = devm_clk_get_optional_enabled(i2s->dev, "c_bclk");
+	if (IS_ERR(i2s->c_bclk))
+		return dev_err_probe(i2s->dev, PTR_ERR(i2s->c_bclk),
+				     "failed to enable c_bclk clock\n");
+
 	i2s->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(i2s->base))
 		return dev_err_probe(i2s->dev, PTR_ERR(i2s->base), "failed to map registers\n");
@@ -444,6 +477,7 @@ static int spacemit_i2s_probe(struct platform_device *pdev)
 
 static const struct of_device_id spacemit_i2s_of_match[] = {
 	{ .compatible = "spacemit,k1-i2s", },
+	{ .compatible = "spacemit,k3-i2s", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, spacemit_i2s_of_match);
@@ -458,4 +492,4 @@ static struct platform_driver spacemit_i2s_driver = {
 module_platform_driver(spacemit_i2s_driver);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("I2S bus driver for SpacemiT K1 SoC");
+MODULE_DESCRIPTION("I2S bus driver for SpacemiT K1/K3 SoC");

-- 
2.54.0