ASoC: spacemit: add K3 SoC support

Troy Mitchell <troy.mitchell@linux.spacemit.com> says:

This series adds K3 SoC support for the SpacemiT I2S controller driver.

Patch 1 adds the dt-bindings for the spacemit,k3-i2s compatible. The K3
SoC uses the same I2S IP as K1 but requires additional clocks
(sysclk_div, c_sysclk, c_bclk) that are shared across multiple I2S
controllers.

Patch 2 adds driver support for K3 SoC with additional clocks.

Link: https://patch.msgid.link/20260522-k3-i2s-v3-0-08e3eb811d93@linux.spacemit.com

Documentation/devicetree/bindings/sound/spacemit,k1-i2s.yaml

@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/sound/spacemit,k1-i2s.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: K1 I2S controller
+title: SpacemiT K1/K3 I2S controller
 
 description:
   The I2S bus (Inter-IC sound bus) is a serial link for digital
@@ -15,27 +15,54 @@ maintainers:
 
 allOf:
   - $ref: dai-common.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: spacemit,k3-i2s
+    then:
+      properties:
+        clocks:
+          minItems: 7
+        clock-names:
+          minItems: 7
+    else:
+      properties:
+        clocks:
+          maxItems: 4
+        clock-names:
+          maxItems: 4
 
 properties:
   compatible:
-    const: spacemit,k1-i2s
+    enum:
+      - spacemit,k1-i2s
+      - spacemit,k3-i2s
 
   reg:
     maxItems: 1
 
   clocks:
+    minItems: 4
     items:
       - description: clock for I2S sysclk
       - description: clock for I2S bclk
       - description: clock for I2S bus
       - description: clock for I2S controller
+      - description: clock for I2S sysclk divider
+      - description: clock for I2S common sysclk
+      - description: clock for I2S common bclk
 
   clock-names:
+    minItems: 4
     items:
       - const: sysclk
       - const: bclk
       - const: bus
       - const: func
+      - const: sysclk_div
+      - const: c_sysclk
+      - const: c_bclk
 
   dmas:
     minItems: 1

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;
@@ -206,6 +209,14 @@ 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;
@@ -217,10 +228,17 @@ 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);
 }
 
@@ -436,6 +454,21 @@ 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");
@@ -462,6 +495,7 @@ 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);
@@ -476,4 +510,4 @@ 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");