[PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

[PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

[Anton D. Stavinskii]

This patch series adds basic audio support for Sophgo CV1800B, 
as used on boards such as the Milk-V Duo. 
The series introduces an AIAO audio mux driver, 
an I2S controller driver, corresponding DT bindings, 
and DTS updates to wire the components together.

The implementation is based on vendor documentation 
and testing on real hardware.  This series relies on 
recent fixes in the DesignWare AXI DMA support; 
in particular, correct operation depends on 
the DMA changes discussed at:
https://lore.kernel.org/all/20251214224601.598358-1-inochiama@gmail.com/ 
The current driver implementation supports a fixed audio configuration 
of 48 kHz sample rate.  The series has been tested on the 
Milk-V Duo 256M board using the Sophgo SG2002 SoC. 
The implementation is expected to also work on Milk-V Duo and Milk-V Module 
boards based on the SG2000 SoC, as the audio 
and DMA blocks are closely related.

Known hardware limitation:
On CV1800B / SG2002, the I2S2 output pins cannot be enabled via pinctrl alone.
Due to SoC design constraints, the output path becomes functional only after 
additional vendor-specific register programming. 
This series makes the limitation explicit and does not attempt to work around 
it implicitly via pinctrl or undocumented behavior.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
Anton D. Stavinskii (8):
      dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding
      ASoC: sophgo: add CV1800B I2S/TDM controller driver
      dt-bindings: sound: sophgo: add CV1800B internal ADC codec
      ASoC: sophgo: add CV1800B internal ADC codec driver
      dt-bindings: sound: sophgo: add CV1800B internal DAC codec
      ASoC: sophgo: add CV1800B internal DAC codec driver
      riscv: dts: sophgo: dts nodes for i2s tdm modules
      riscv: dts: sophgo: add Milk-V Duo 256M board dts

 .../bindings/sound/sophgo,cv1800b-i2s.yaml         |  75 +++
 .../bindings/sound/sophgo,cv1800b-sound-adc.yaml   |  43 ++
 .../bindings/sound/sophgo,cv1800b-sound-dac.yaml   |  43 ++
 arch/riscv/boot/dts/sophgo/Makefile                |   1 +
 arch/riscv/boot/dts/sophgo/cv180x-dmamux.h         |  57 ++
 arch/riscv/boot/dts/sophgo/cv180x.dtsi             |  49 ++
 .../boot/dts/sophgo/sg2002-milkv-duo-256m.dts      | 231 +++++++
 sound/soc/Kconfig                                  |   1 +
 sound/soc/Makefile                                 |   1 +
 sound/soc/sophgo/Kconfig                           |  41 ++
 sound/soc/sophgo/Makefile                          |   5 +
 sound/soc/sophgo/cv1800b-sound-adc.c               | 322 ++++++++++
 sound/soc/sophgo/cv1800b-sound-dac.c               | 204 ++++++
 sound/soc/sophgo/cv1800b-tdm.c                     | 714 +++++++++++++++++++++
 14 files changed, 1787 insertions(+)
---
base-commit: 7a52965b6976c936f413eebeee3f78c6faf09012
change-id: 20260115-cv1800b-i2s-driver-4f17836dec56

Best regards,
-- 
Anton D. Stavinskii <stavinsky@gmail.com>

[PATCH 1/8] dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding

[Anton D. Stavinskii]

Purpose: introduce DT schema for the CPU driver

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 .../bindings/sound/sophgo,cv1800b-i2s.yaml         | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
new file mode 100644
index 000000000000..cf30880a62da
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-i2s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800B I2S/TDM controller
+
+maintainers:
+  - Anton D. Stavinskii <stavinsky@gmail.com>
+
+description: |
+  I2S/TDM controller found in CV1800B / Sophgo SG2002/SG2000 SoCs.
+
+properties:
+  compatible:
+    const: sophgo,cv1800b-i2s
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: i2s
+      - const: mclk
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    description: |
+      Names of DMA channels. May be omitted. If present, one entry
+      selects a single direction, while two entries select RX and TX.
+    minItems: 1
+    maxItems: 2
+    items:
+      enum: [rx, tx]
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#sound-dai-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/sophgo,cv1800.h>
+
+    i2s1: i2s@4110000 {
+        compatible = "sophgo,cv1800b-i2s";
+        reg = <0x04110000 0x10000>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        clocks = <&clk CLK_APB_I2S1>,  <&clk CLK_SDMA_AUD1>;
+        clock-names = "i2s", "mclk";
+        dmas = <&dmamux 2 1>, <&dmamux 3 1>;
+        dma-names = "rx", "tx";
+    };
+...

-- 
2.43.0

[PATCH 2/8] ASoC: sophgo: add CV1800B I2S/TDM controller driver

[Anton D. Stavinskii]

The actual CPU DAI controller.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 sound/soc/Kconfig              |   1 +
 sound/soc/Makefile             |   1 +
 sound/soc/sophgo/Kconfig       |  20 ++
 sound/soc/sophgo/Makefile      |   3 +
 sound/soc/sophgo/cv1800b-tdm.c | 714 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 739 insertions(+)

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index 36e0d443ba0e..edfdcbf734fe 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -127,6 +127,7 @@ source "sound/soc/renesas/Kconfig"
 source "sound/soc/rockchip/Kconfig"
 source "sound/soc/samsung/Kconfig"
 source "sound/soc/sdca/Kconfig"
+source "sound/soc/sophgo/Kconfig"
 source "sound/soc/spacemit/Kconfig"
 source "sound/soc/spear/Kconfig"
 source "sound/soc/sprd/Kconfig"
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 8c0480e6484e..21d8406767fc 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_SND_SOC)	+= rockchip/
 obj-$(CONFIG_SND_SOC)	+= samsung/
 obj-$(CONFIG_SND_SOC)	+= sdca/
 obj-$(CONFIG_SND_SOC)	+= sof/
+obj-$(CONFIG_SND_SOC)   += sophgo/
 obj-$(CONFIG_SND_SOC)	+= spacemit/
 obj-$(CONFIG_SND_SOC)	+= spear/
 obj-$(CONFIG_SND_SOC)	+= sprd/
diff --git a/sound/soc/sophgo/Kconfig b/sound/soc/sophgo/Kconfig
new file mode 100644
index 000000000000..70f07d46c810
--- /dev/null
+++ b/sound/soc/sophgo/Kconfig
@@ -0,0 +1,20 @@
+menu "Sophgo"
+	depends on COMPILE_TEST || ARCH_SOPHGO
+
+config SND_SOC_CV1800B_TDM
+	tristate "Sophgo CV1800B I2S/TDM support"
+	depends on SND_SOC && OF
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  This option enables the I2S/TDM audio controller found in Sophgo
+	  CV1800B / SG2002 SoCs. The controller supports standard I2S
+	  audio modes for playback and capture.
+
+	  The driver integrates with the ASoC framework and uses the DMA
+	  engine for audio data transfer. It is intended to be configured
+	  via Device Tree along with simple-audio-card module.
+
+	  To compile the driver as a module, choose M here: the module will
+	  be called cv1800b_tdm.
+
+endmenu
diff --git a/sound/soc/sophgo/Makefile b/sound/soc/sophgo/Makefile
new file mode 100644
index 000000000000..3f9f1d07227a
--- /dev/null
+++ b/sound/soc/sophgo/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+# Sophgo Platform Support
+obj-$(CONFIG_SND_SOC_CV1800B_TDM) += cv1800b-tdm.o
diff --git a/sound/soc/sophgo/cv1800b-tdm.c b/sound/soc/sophgo/cv1800b-tdm.c
new file mode 100644
index 000000000000..5bd9236ef3b9
--- /dev/null
+++ b/sound/soc/sophgo/cv1800b-tdm.c
@@ -0,0 +1,714 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <linux/string.h>
+#include <linux/dev_printk.h>
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/limits.h>
+
+#define TX_FIFO_SIZE (1024)
+#define RX_FIFO_SIZE (1024)
+#define TX_MAX_BURST (8)
+#define RX_MAX_BURST (8)
+
+#define CV1800B_DEF_FREQ          24576000
+#define CV1800B_DEF_MCLK_FS_RATIO 256
+
+/* tdm registers */
+#define CV1800B_BLK_MODE_SETTING  0x000
+#define CV1800B_FRAME_SETTING     0x004
+#define CV1800B_SLOT_SETTING1     0x008
+#define CV1800B_SLOT_SETTING2     0x00C
+#define CV1800B_DATA_FORMAT       0x010
+#define CV1800B_BLK_CFG           0x014
+#define CV1800B_I2S_ENABLE        0x018
+#define CV1800B_I2S_RESET         0x01C
+#define CV1800B_I2S_INT_EN        0x020
+#define CV1800B_I2S_INT           0x024
+#define CV1800B_FIFO_THRESHOLD    0x028
+#define CV1800B_LRCK_MASTER       0x02C /* special clock only mode */
+#define CV1800B_FIFO_RESET        0x030
+#define CV1800B_RX_STATUS         0x040
+#define CV1800B_TX_STATUS         0x048
+#define CV1800B_CLK_CTRL0         0x060
+#define CV1800B_CLK_CTRL1         0x064
+#define CV1800B_PCM_SYNTH         0x068
+#define CV1800B_RX_RD_PORT        0x080
+#define CV1800B_TX_WR_PORT        0x0C0
+
+/* CV1800B_BLK_MODE_SETTING (0x000) */
+#define BLK_TX_MODE_MASK                   GENMASK(0, 0)
+#define BLK_MASTER_MODE_MASK               GENMASK(1, 1)
+#define BLK_DMA_MODE_MASK                  GENMASK(7, 7)
+
+/* CV1800B_CLK_CTRL1 (0x064) */
+#define CLK_MCLK_DIV_MASK                  GENMASK(15, 0)
+#define CLK_BCLK_DIV_MASK                  GENMASK(31, 16)
+
+/* CV1800B_CLK_CTRL0 (0x060) */
+#define CLK_AUD_CLK_SEL_MASK               GENMASK(0, 0)
+#define CLK_BCLK_OUT_CLK_FORCE_EN_MASK     GENMASK(6, 6)
+#define CLK_MCLK_OUT_EN_MASK               GENMASK(7, 7)
+#define CLK_AUD_EN_MASK                    GENMASK(8, 8)
+
+/* CV1800B_I2S_RESET (0x01C) */
+#define RST_I2S_RESET_RX_MASK              GENMASK(0, 0)
+#define RST_I2S_RESET_TX_MASK              GENMASK(1, 1)
+
+/* CV1800B_FIFO_RESET (0x030) */
+#define FIFO_RX_RESET_MASK                 GENMASK(0, 0)
+#define FIFO_TX_RESET_MASK                 GENMASK(16, 16)
+
+/* CV1800B_I2S_ENABLE (0x018) */
+#define I2S_ENABLE_MASK                    GENMASK(0, 0)
+
+/* CV1800B_BLK_CFG (0x014) */
+#define BLK_AUTO_DISABLE_WITH_CH_EN_MASK   GENMASK(4, 4)
+#define BLK_RX_BLK_CLK_FORCE_EN_MASK       GENMASK(8, 8)
+#define BLK_RX_FIFO_DMA_CLK_FORCE_EN_MASK  GENMASK(9, 9)
+#define BLK_TX_BLK_CLK_FORCE_EN_MASK       GENMASK(16, 16)
+#define BLK_TX_FIFO_DMA_CLK_FORCE_EN_MASK  GENMASK(17, 17)
+
+/* CV1800B_FRAME_SETTING (0x004) */
+#define FRAME_LENGTH_MASK                  GENMASK(8, 0)
+#define FS_ACTIVE_LENGTH_MASK              GENMASK(23, 16)
+
+/* CV1800B_I2S_INT_EN (0x020) */
+#define INT_I2S_INT_EN_MASK                GENMASK(8, 8)
+
+/* CV1800B_SLOT_SETTING2 (0x00C) */
+#define SLOT_EN_MASK                       GENMASK(15, 0)
+
+/* CV1800B_LRCK_MASTER (0x02C) */
+#define LRCK_MASTER_ENABLE_MASK            GENMASK(0, 0)
+
+/* CV1800B_DATA_FORMAT (0x010) */
+#define DF_WORD_LENGTH_MASK	           GENMASK(2, 1)
+#define DF_TX_SOURCE_LEFT_ALIGN_MASK       GENMASK(6, 6)
+
+/* CV1800B_FIFO_THRESHOLD (0x028) */
+#define FIFO_RX_THRESHOLD_MASK	           GENMASK(4, 0)
+#define FIFO_TX_THRESHOLD_MASK	           GENMASK(20, 16)
+#define FIFO_TX_HIGH_THRESHOLD_MASK        GENMASK(28, 24)
+
+/* CV1800B_SLOT_SETTING1 (0x008) */
+#define SLOT_NUM_MASK                      GENMASK(3, 0)
+#define SLOT_SIZE_MASK                     GENMASK(13, 8)
+#define DATA_SIZE_MASK                     GENMASK(20, 16)
+#define FB_OFFSET_MASK                     GENMASK(28, 24)
+
+enum cv1800b_tdm_word_length {
+	CV1800B_WORD_LENGTH_8_BIT = 0,
+	CV1800B_WORD_LENGTH_16_BIT = 1,
+	CV1800B_WORD_LENGTH_32_BIT = 2,
+};
+
+struct cv1800b_i2s {
+	void __iomem *base;
+	struct clk *clk;
+	struct clk *sysclk;
+	struct device *dev;
+	struct snd_dmaengine_dai_dma_data playback_dma;
+	struct snd_dmaengine_dai_dma_data capture_dma;
+	u32 mclk_rate;
+	bool bclk_ratio_fixed;
+	u32 bclk_ratio;
+
+};
+
+static void cv1800b_setup_dma_struct(struct cv1800b_i2s *i2s,
+				     phys_addr_t phys_base)
+{
+	i2s->playback_dma.addr = phys_base + CV1800B_TX_WR_PORT;
+	i2s->playback_dma.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	i2s->playback_dma.fifo_size = TX_FIFO_SIZE;
+	i2s->playback_dma.maxburst = TX_MAX_BURST;
+
+	i2s->capture_dma.addr = phys_base + CV1800B_RX_RD_PORT;
+	i2s->capture_dma.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	i2s->capture_dma.fifo_size = RX_FIFO_SIZE;
+	i2s->capture_dma.maxburst = RX_MAX_BURST;
+}
+
+static const struct snd_dmaengine_pcm_config cv1800b_i2s_pcm_config = {
+	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+};
+
+static void cv1800b_reset_fifo(struct cv1800b_i2s *i2s)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_FIFO_RESET);
+	val = u32_replace_bits(val, 1, FIFO_RX_RESET_MASK);
+	val = u32_replace_bits(val, 1, FIFO_TX_RESET_MASK);
+	writel(val, i2s->base + CV1800B_FIFO_RESET);
+
+	usleep_range(10, 20);
+
+	val = readl(i2s->base + CV1800B_FIFO_RESET);
+	val = u32_replace_bits(val, 0, FIFO_RX_RESET_MASK);
+	val = u32_replace_bits(val, 0, FIFO_TX_RESET_MASK);
+	writel(val, i2s->base + CV1800B_FIFO_RESET);
+}
+
+static void cv1800b_reset_i2s(struct cv1800b_i2s *i2s)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_I2S_RESET);
+	val = u32_replace_bits(val, 1, RST_I2S_RESET_RX_MASK);
+	val = u32_replace_bits(val, 1, RST_I2S_RESET_TX_MASK);
+	writel(val, i2s->base + CV1800B_I2S_RESET);
+
+	usleep_range(10, 20);
+
+	val = readl(i2s->base + CV1800B_I2S_RESET);
+	val = u32_replace_bits(val, 0, RST_I2S_RESET_RX_MASK);
+	val = u32_replace_bits(val, 0, RST_I2S_RESET_TX_MASK);
+	writel(val, i2s->base + CV1800B_I2S_RESET);
+}
+
+static void cv1800b_set_mclk_div(struct cv1800b_i2s *i2s, u32 mclk_div)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL1);
+	val = u32_replace_bits(val, mclk_div, CLK_MCLK_DIV_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL1);
+	dev_dbg(i2s->dev, "mclk_div is set to %u\n", mclk_div);
+}
+
+static void cv1800b_set_tx_mode(struct cv1800b_i2s *i2s, bool is_tx)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_BLK_MODE_SETTING);
+	val = u32_replace_bits(val, is_tx, BLK_TX_MODE_MASK);
+	writel(val, i2s->base + CV1800B_BLK_MODE_SETTING);
+	dev_dbg(i2s->dev, "tx_mode is set to %u\n", is_tx);
+}
+
+static int cv1800b_set_bclk_div(struct cv1800b_i2s *i2s, u32 bclk_div)
+{
+	u32 val;
+
+	if (bclk_div == 0 || bclk_div > 0xFFFF)
+		return -EINVAL;
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL1);
+	val = u32_replace_bits(val, bclk_div, CLK_BCLK_DIV_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL1);
+	dev_dbg(i2s->dev, "bclk_div is set to %u\n", bclk_div);
+	return 0;
+}
+
+/* set memory width of audio data , reg word_length */
+static int cv1800b_set_word_length(struct cv1800b_i2s *i2s,
+				   unsigned int physical_width)
+{
+	u8 word_length_val;
+	u32 val;
+
+	switch (physical_width) {
+	case 8:
+		word_length_val = CV1800B_WORD_LENGTH_8_BIT;
+		break;
+	case 16:
+		word_length_val = CV1800B_WORD_LENGTH_16_BIT;
+		break;
+	case 32:
+		word_length_val = CV1800B_WORD_LENGTH_32_BIT;
+		break;
+	default:
+		dev_dbg(i2s->dev, "can't set word_length field\n");
+		return -EINVAL;
+	}
+
+	val = readl(i2s->base + CV1800B_DATA_FORMAT);
+	val = u32_replace_bits(val, word_length_val, DF_WORD_LENGTH_MASK);
+	writel(val, i2s->base + CV1800B_DATA_FORMAT);
+	return 0;
+}
+
+static void cv1800b_enable_clocks(struct cv1800b_i2s *i2s, bool enabled)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL0);
+	val = u32_replace_bits(val, enabled, CLK_AUD_EN_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL0);
+}
+
+static int cv1800b_set_slot_settings(struct cv1800b_i2s *i2s, u32 slots,
+				     u32 physical_width, u32 data_size)
+{
+	u32 slot_num;
+	u32 slot_size;
+	u32 frame_length;
+	u32 frame_active_length;
+	u32 val;
+
+	if (!slots || !physical_width || !data_size) {
+		dev_err(i2s->dev, "frame or slot settings are not valid\n");
+		return -EINVAL;
+	}
+	if (slots > 16 || physical_width > 64 || data_size > 32) {
+		dev_err(i2s->dev, "frame or slot settings are not valid\n");
+		return -EINVAL;
+	}
+
+	slot_num = slots - 1;
+	slot_size = physical_width - 1;
+	frame_length = (physical_width * slots) - 1;
+	frame_active_length = physical_width - 1;
+
+	if (frame_length > 511 || frame_active_length > 255) {
+		dev_err(i2s->dev, "frame or slot settings are not valid\n");
+		return -EINVAL;
+	}
+
+	val = readl(i2s->base + CV1800B_SLOT_SETTING1);
+	val = u32_replace_bits(val, slot_size, SLOT_SIZE_MASK);
+	val = u32_replace_bits(val, data_size - 1, DATA_SIZE_MASK);
+	val = u32_replace_bits(val, slot_num, SLOT_NUM_MASK);
+	writel(val, i2s->base + CV1800B_SLOT_SETTING1);
+
+	val = readl(i2s->base + CV1800B_FRAME_SETTING);
+	val = u32_replace_bits(val, frame_length, FRAME_LENGTH_MASK);
+	val = u32_replace_bits(val, frame_active_length, FS_ACTIVE_LENGTH_MASK);
+	writel(val, i2s->base + CV1800B_FRAME_SETTING);
+
+	dev_dbg(i2s->dev, "slot settings num: %u width: %u\n", slots, physical_width);
+	return 0;
+}
+
+/*
+ * calculate mclk_div.
+ * if requested value is bigger than optimal
+ * leave mclk_div as 1. cff clock is capable
+ * to handle it
+ */
+static int cv1800b_calc_mclk_div(unsigned int target_mclk, u32 *mclk_div)
+{
+	*mclk_div = 1;
+
+	if (target_mclk == 0)
+		return -EINVAL;
+
+	/* optimal parent frequency is close to CV1800B_DEF_FREQ */
+	if (target_mclk < CV1800B_DEF_FREQ) {
+		*mclk_div = DIV_ROUND_CLOSEST(CV1800B_DEF_FREQ, target_mclk);
+		if (!*mclk_div || *mclk_div > 0xFFFF)
+			return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * set CCF clock and divider for this clock
+ * mclk_clock = ccf_clock / mclk_div
+ */
+static int cv1800b_i2s_set_rate_for_mclk(struct cv1800b_i2s *i2s,
+					 unsigned int target_mclk)
+{
+	u32 mclk_div = 1;
+	u64 tmp;
+	int ret;
+	unsigned long clk_rate;
+	unsigned long actual;
+
+	ret = cv1800b_calc_mclk_div(target_mclk, &mclk_div);
+	if (ret) {
+		dev_dbg(i2s->dev, "can't calc mclk_div for freq %u\n",
+			target_mclk);
+		return ret;
+	}
+
+	tmp = (u64)target_mclk * mclk_div;
+	if (tmp > ULONG_MAX) {
+		dev_err(i2s->dev, "clk_rate overflow: freq=%u div=%u\n",
+			target_mclk, mclk_div);
+		return -ERANGE;
+	}
+
+	clk_rate = (unsigned long)tmp;
+
+	cv1800b_enable_clocks(i2s, false);
+
+	ret = clk_set_rate(i2s->sysclk, clk_rate);
+	if (ret)
+		return ret;
+
+	actual = clk_get_rate(i2s->sysclk);
+	if (clk_rate != actual) {
+		dev_err_ratelimited(i2s->dev,
+				    "clk_set_rate failed %lu, actual is %lu\n",
+				    clk_rate, actual);
+	}
+
+	cv1800b_set_mclk_div(i2s, mclk_div);
+	cv1800b_enable_clocks(i2s, true);
+
+	return 0;
+}
+
+static int cv1800b_i2s_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params,
+				 struct snd_soc_dai *dai)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate = params_rate(params);
+	unsigned int channels = params_channels(params);
+	unsigned int physical_width = params_physical_width(params);
+	int data_width = params_width(params);
+	bool tx_mode = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 1 : 0;
+	int ret;
+	u32 bclk_div;
+	u32 bclk_ratio;
+	u32 mclk_rate;
+	u64 tmp;
+
+	if (data_width < 0)
+		return data_width;
+
+	if (!channels || !rate || !physical_width)
+		return -EINVAL;
+
+	ret = cv1800b_set_slot_settings(i2s, channels, physical_width, data_width);
+	if (ret)
+		return ret;
+
+	if (i2s->mclk_rate) {
+		mclk_rate = i2s->mclk_rate;
+	} else {
+		dev_dbg(i2s->dev, "mclk is not set by machine driver\n");
+		ret = cv1800b_i2s_set_rate_for_mclk(i2s,
+						    rate * CV1800B_DEF_MCLK_FS_RATIO);
+		if (ret)
+			return ret;
+		mclk_rate = rate * CV1800B_DEF_MCLK_FS_RATIO;
+	}
+
+	bclk_ratio = (i2s->bclk_ratio_fixed) ? i2s->bclk_ratio :
+					       (physical_width * channels);
+
+	tmp = (u64)rate * bclk_ratio;
+	if (!tmp)
+		return -EINVAL;
+	if (mclk_rate % tmp)
+		dev_warn(i2s->dev, "mclk rate is not aligned to bclk or rate\n");
+
+	bclk_div = DIV_ROUND_CLOSEST((u64)mclk_rate, tmp);
+
+	ret = cv1800b_set_bclk_div(i2s, bclk_div);
+	if (ret)
+		return ret;
+
+	ret = cv1800b_set_word_length(i2s, physical_width);
+	if (ret)
+		return ret;
+
+	cv1800b_set_tx_mode(i2s, tx_mode);
+
+	cv1800b_reset_fifo(i2s);
+	cv1800b_reset_i2s(i2s);
+	return 0;
+}
+
+static int cv1800b_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+			       struct snd_soc_dai *dai)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_I2S_ENABLE);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		val = u32_replace_bits(val, 1, I2S_ENABLE_MASK);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		val = u32_replace_bits(val, 0, I2S_ENABLE_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+	writel(val, i2s->base + CV1800B_I2S_ENABLE);
+	return 0;
+}
+
+static int cv1800b_i2s_startup(struct snd_pcm_substream *substream,
+			       struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	struct snd_soc_dai_link *dai_link = rtd->dai_link;
+
+	dev_dbg(i2s->dev, "%s: dai=%s substream=%d\n", __func__, dai->name,
+		substream->stream);
+	/**
+	 * Ensure DMA is stopped before DAI
+	 * shutdown (prevents DW AXI DMAC stop/busy on next open).
+	 */
+	dai_link->trigger_stop = SND_SOC_TRIGGER_ORDER_LDC;
+	return 0;
+}
+
+static int cv1800b_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	if (!i2s) {
+		dev_err(dai->dev, "no drvdata in DAI probe\n");
+		return -ENODEV;
+	}
+
+	snd_soc_dai_init_dma_data(dai, &i2s->playback_dma, &i2s->capture_dma);
+	return 0;
+}
+
+static int cv1800b_i2s_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	u32 val;
+	u32 master;
+
+	/* only i2s format is supported */
+	if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_I2S)
+		return -EINVAL;
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBP_CFP:
+		dev_dbg(i2s->dev, "set to master mode\n");
+		master = 1;
+		break;
+
+	case SND_SOC_DAIFMT_CBC_CFC:
+		dev_dbg(i2s->dev, "set to slave mode\n");
+		master = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	val = readl(i2s->base + CV1800B_BLK_MODE_SETTING);
+	val = u32_replace_bits(val, master, BLK_MASTER_MODE_MASK);
+	writel(val, i2s->base + CV1800B_BLK_MODE_SETTING);
+	return 0;
+}
+
+static int cv1800b_i2s_dai_set_bclk_ratio(struct snd_soc_dai *dai,
+					  unsigned int ratio)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	if (ratio == 0)
+		return -EINVAL;
+	i2s->bclk_ratio = ratio;
+	i2s->bclk_ratio_fixed = true;
+	return 0;
+}
+
+static int cv1800b_i2s_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+				      unsigned int freq, int dir)
+{
+	struct cv1800b_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	int ret;
+	u32 val;
+	bool output_enable = (dir == SND_SOC_CLOCK_OUT) ? true : false;
+
+	dev_dbg(i2s->dev, "%s called with %u\n", __func__, freq);
+	ret = cv1800b_i2s_set_rate_for_mclk(i2s, freq);
+	if (ret)
+		return ret;
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL0);
+	val = u32_replace_bits(val, output_enable, CLK_MCLK_OUT_EN_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL0);
+
+	i2s->mclk_rate = freq;
+	return 0;
+}
+
+static const struct snd_soc_dai_ops cv1800b_i2s_dai_ops = {
+	.probe = cv1800b_i2s_dai_probe,
+	.startup = cv1800b_i2s_startup,
+	.hw_params = cv1800b_i2s_hw_params,
+	.trigger = cv1800b_i2s_trigger,
+	.set_fmt = cv1800b_i2s_dai_set_fmt,
+	.set_bclk_ratio = cv1800b_i2s_dai_set_bclk_ratio,
+	.set_sysclk = cv1800b_i2s_dai_set_sysclk,
+};
+
+static struct snd_soc_dai_driver cv1800b_i2s_dai_template = {
+	.name = "cv1800b-i2s",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = &cv1800b_i2s_dai_ops,
+};
+
+static const struct snd_soc_component_driver cv1800b_i2s_component = {
+	.name = "cv1800b-i2s",
+};
+
+static void cv1800b_i2s_hw_disable(struct cv1800b_i2s *i2s)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_I2S_ENABLE);
+	val = u32_replace_bits(val, 0, I2S_ENABLE_MASK);
+	writel(val, i2s->base + CV1800B_I2S_ENABLE);
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL0);
+	val = u32_replace_bits(val, 0, CLK_AUD_EN_MASK);
+	val = u32_replace_bits(val, 0, CLK_MCLK_OUT_EN_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL0);
+
+	val = readl(i2s->base + CV1800B_I2S_RESET);
+	val = u32_replace_bits(val, 1, RST_I2S_RESET_RX_MASK);
+	val = u32_replace_bits(val, 1, RST_I2S_RESET_TX_MASK);
+	writel(val, i2s->base + CV1800B_I2S_RESET);
+
+	val = readl(i2s->base + CV1800B_FIFO_RESET);
+	val = u32_replace_bits(val, 1, FIFO_RX_RESET_MASK);
+	val = u32_replace_bits(val, 1, FIFO_TX_RESET_MASK);
+	writel(val, i2s->base + CV1800B_FIFO_RESET);
+}
+
+static void cv1800b_i2s_setup_tdm(struct cv1800b_i2s *i2s)
+{
+	u32 val;
+
+	val = readl(i2s->base + CV1800B_BLK_MODE_SETTING);
+	val = u32_replace_bits(val, 1, BLK_DMA_MODE_MASK);
+	writel(val, i2s->base + CV1800B_BLK_MODE_SETTING);
+
+	val = readl(i2s->base + CV1800B_CLK_CTRL0);
+	val = u32_replace_bits(val, 0, CLK_AUD_CLK_SEL_MASK);
+	val = u32_replace_bits(val, 0, CLK_MCLK_OUT_EN_MASK);
+	val = u32_replace_bits(val, 0, CLK_AUD_EN_MASK);
+	writel(val, i2s->base + CV1800B_CLK_CTRL0);
+
+	val = readl(i2s->base + CV1800B_FIFO_THRESHOLD);
+	val = u32_replace_bits(val, 4, FIFO_RX_THRESHOLD_MASK);
+	val = u32_replace_bits(val, 4, FIFO_TX_THRESHOLD_MASK);
+	val = u32_replace_bits(val, 4, FIFO_TX_HIGH_THRESHOLD_MASK);
+	writel(val, i2s->base + CV1800B_FIFO_THRESHOLD);
+
+	val = readl(i2s->base + CV1800B_I2S_ENABLE);
+	val = u32_replace_bits(val, 0, I2S_ENABLE_MASK);
+	writel(val, i2s->base + CV1800B_I2S_ENABLE);
+}
+
+static int cv1800b_i2s_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cv1800b_i2s *i2s;
+	struct resource *res;
+	void __iomem *regs;
+	struct snd_soc_dai_driver *dai;
+	int ret;
+
+	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
+	if (!i2s)
+		return -ENOMEM;
+
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+	i2s->dev = &pdev->dev;
+	i2s->base = regs;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	cv1800b_setup_dma_struct(i2s, res->start);
+
+	i2s->clk = devm_clk_get_enabled(dev, "i2s");
+	if (IS_ERR(i2s->clk))
+		return dev_err_probe(dev, PTR_ERR(i2s->clk),
+				     "failed to get+enable i2s\n");
+	i2s->sysclk = devm_clk_get_enabled(dev, "mclk");
+	if (IS_ERR(i2s->sysclk))
+		return dev_err_probe(dev, PTR_ERR(i2s->sysclk),
+				     "failed to get+enable mclk\n");
+
+	platform_set_drvdata(pdev, i2s);
+	cv1800b_i2s_setup_tdm(i2s);
+
+	dai = devm_kmemdup(dev, &cv1800b_i2s_dai_template, sizeof(*dai),
+			   GFP_KERNEL);
+	if (!dai)
+		return -ENOMEM;
+
+	ret = devm_snd_soc_register_component(dev, &cv1800b_i2s_component, dai,
+					      1);
+	if (ret)
+		return ret;
+
+	ret = devm_snd_dmaengine_pcm_register(dev, &cv1800b_i2s_pcm_config, 0);
+	if (ret) {
+		dev_err(dev, "dmaengine_pcm_register failed: %d\n", ret);
+		return ret;
+	}
+
+	dev_dbg(dev, "cv1800b I2S probed:\n");
+	return 0;
+}
+
+static void cv1800b_i2s_remove(struct platform_device *pdev)
+{
+	struct cv1800b_i2s *i2s = platform_get_drvdata(pdev);
+
+	if (!i2s)
+		return;
+	cv1800b_i2s_hw_disable(i2s);
+}
+
+static const struct of_device_id cv1800b_i2s_of_match[] = {
+	{ .compatible = "sophgo,cv1800b-i2s" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, cv1800b_i2s_of_match);
+
+static struct platform_driver cv1800b_i2s_driver = {
+	.probe = cv1800b_i2s_probe,
+	.remove = cv1800b_i2s_remove,
+	.driver = {
+		.name = "cv1800b-i2s",
+		.of_match_table = cv1800b_i2s_of_match,
+	},
+};
+module_platform_driver(cv1800b_i2s_driver);
+
+MODULE_DESCRIPTION("Sophgo cv1800b I2S/TDM driver");
+MODULE_AUTHOR("Anton D. Stavinsky <stavinsky@gmail.com>");
+MODULE_LICENSE("GPL");

-- 
2.43.0

[PATCH 3/8] dt-bindings: sound: sophgo: add CV1800B internal ADC codec

[Anton D. Stavinskii]

Document the internal ADC audio codec integrated in the Sophgo
CV1800B SoC.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 .../bindings/sound/sophgo,cv1800b-sound-adc.yaml   | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-adc.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-adc.yaml
new file mode 100644
index 000000000000..339b60e317e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-adc.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-sound-adc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800B Internal ADC Codec
+
+maintainers:
+  - Anton D. Stavinskii <stavinsky@gmail.com>
+
+description: |
+  Internal ADC audio codec integrated in the Sophgo CV1800B SoC.
+  The codec exposes a single DAI and is intended to be connected
+  to an I2S/TDM controller via an ASoC machine driver.
+
+properties:
+  compatible:
+    const: sophgo,cv1800b-sound-adc
+
+  reg:
+    maxItems: 1
+    description:
+      Base address and size of the ADC register block.
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    audio-codec@300a100 {
+      compatible = "sophgo,cv1800b-sound-adc";
+      reg = <0x0300a100 0x100>;
+      #sound-dai-cells = <0>;
+    };
+...

-- 
2.43.0

[PATCH 4/8] ASoC: sophgo: add CV1800B internal ADC codec driver

[Anton D. Stavinskii]

Codec DAI endpoint for RXADC + basic controls.
THe codec have basic volume control. Which is
imlemented by lookup table for simplicity.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 sound/soc/sophgo/Kconfig             |  12 ++
 sound/soc/sophgo/Makefile            |   1 +
 sound/soc/sophgo/cv1800b-sound-adc.c | 322 +++++++++++++++++++++++++++++++++++
 3 files changed, 335 insertions(+)

diff --git a/sound/soc/sophgo/Kconfig b/sound/soc/sophgo/Kconfig
index 70f07d46c810..813ab30d6da3 100644
--- a/sound/soc/sophgo/Kconfig
+++ b/sound/soc/sophgo/Kconfig
@@ -17,4 +17,16 @@ config SND_SOC_CV1800B_TDM
 	  To compile the driver as a module, choose M here: the module will
 	  be called cv1800b_tdm.
 
+config SND_SOC_CV1800B_ADC_CODEC
+	tristate "Sophgo CV1800B/SG2002 internal ADC codec"
+	depends on SND_SOC
+	help
+	  This driver provides an ASoC codec DAI for capture and basic
+	  control of the RXADC registers.
+
+	  Say Y or M to build support for the Sophgo CV1800B
+	  internal analog ADC codec block (RXADC).
+	  The module will be called cv1800b-sound-adc
+
+
 endmenu
diff --git a/sound/soc/sophgo/Makefile b/sound/soc/sophgo/Makefile
index 3f9f1d07227a..c654d6059cbd 100644
--- a/sound/soc/sophgo/Makefile
+++ b/sound/soc/sophgo/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 # Sophgo Platform Support
 obj-$(CONFIG_SND_SOC_CV1800B_TDM) += cv1800b-tdm.o
+obj-$(CONFIG_SND_SOC_CV1800B_ADC_CODEC) += cv1800b-sound-adc.o
diff --git a/sound/soc/sophgo/cv1800b-sound-adc.c b/sound/soc/sophgo/cv1800b-sound-adc.c
new file mode 100644
index 000000000000..794030b713e9
--- /dev/null
+++ b/sound/soc/sophgo/cv1800b-sound-adc.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Internal adc codec for cv1800b compatible SoC
+ *
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/soc.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <sound/tlv.h>
+#include <sound/soc-component.h>
+#include <sound/control.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+
+#define CV1800B_RXADC_WORD_LEN 16
+#define CV1800B_RXADC_CHANNELS 2
+
+#define CV1800B_RXADC_CTRL0    0x00
+#define CV1800B_RXADCC_CTRL1   0x04
+#define CV1800B_RXADC_STATUS   0x08
+#define CV1800B_RXADC_CLK      0x0c
+#define CV1800B_RXADC_ANA0     0x10
+#define CV1800B_RXADC_ANA1     0x14
+#define CV1800B_RXADC_ANA2     0x18
+#define CV1800B_RXADC_ANA3     0x1c
+#define CV1800B_RXADC_ANA4     0x20
+
+/* CV1800B_RXADC_CTRL0 */
+#define REG_RXADC_EN                   GENMASK(0, 0)
+#define REG_I2S_TX_EN                  GENMASK(1, 1)
+
+/* CV1800B_RXADCC_CTRL1 */
+#define REG_RXADC_CIC_OPT              GENMASK(1, 0)
+#define REG_RXADC_IGR_INIT             GENMASK(8, 8)
+
+/* CV1800B_RXADC_ANA0 */
+#define REG_GSTEPL_RXPGA               GENMASK(12, 0)
+#define REG_G6DBL_RXPGA                GENMASK(13, 13)
+#define REG_GAINL_RXADC                GENMASK(15, 14)
+#define REG_GSTEPR_RXPGA               GENMASK(28, 16)
+#define REG_G6DBR_RXPGA                GENMASK(29, 29)
+#define REG_GAINR_RXADC                GENMASK(31, 30)
+#define REG_COMB_LEFT_VOLUME           GENMASK(15, 0)
+#define REG_COMB_RIGHT_VOLUME          GENMASK(31, 16)
+
+/* CV1800B_RXADC_ANA2 */
+#define REG_MUTEL_RXPGA                GENMASK(0, 0)
+#define REG_MUTER_RXPGA                GENMASK(1, 1)
+
+/* CV1800B_RXADC_CLK */
+#define REG_RXADC_CLK_INV              GENMASK(0, 0)
+#define REG_RXADC_SCK_DIV              GENMASK(15, 8)
+#define REG_RXADC_DLYEN                GENMASK(23, 16)
+
+enum decimation_values {
+	DECIMATION_64 = 0,
+	DECIMATION_128,
+	DECIMATION_256,
+	DECIMATION_512,
+};
+
+static const u32 cv1800b_gains[] = {
+	0x0001, /* 0dB */
+	0x0002, /* 2dB */
+	0x0004, /* 4dB */
+	0x0008, /* 6dB */
+	0x0010, /* 8dB */
+	0x0020, /* 10dB */
+	0x0040, /* 12dB */
+	0x0080, /* 14dB */
+	0x0100, /* 16dB */
+	0x0200, /* 18dB */
+	0x0400, /* 20dB */
+	0x0800, /* 22dB */
+	0x1000, /* 24dB */
+	0x2400, /* 26dB */
+	0x2800, /* 28dB */
+	0x3000, /* 30dB */
+	0x6400, /* 32dB */
+	0x6800, /* 34dB */
+	0x7000, /* 36dB */
+	0xA400, /* 38dB */
+	0xA800, /* 40dB */
+	0xB000, /* 42dB */
+	0xE400, /* 44dB */
+	0xE800, /* 46dB */
+	0xF000, /* 48dB */
+};
+
+struct cv1800b_priv {
+	void __iomem *regs;
+	struct device *dev;
+	unsigned int mclk_rate;
+};
+
+static int cv1800b_adc_setbclk_div(struct cv1800b_priv *priv, unsigned int rate)
+{
+	u32 val;
+	u32 bclk_div;
+	u64 tmp;
+
+	if (!priv->mclk_rate || !rate)
+		return -EINVAL;
+
+	tmp = priv->mclk_rate;
+	tmp /= CV1800B_RXADC_WORD_LEN;
+	tmp /= CV1800B_RXADC_CHANNELS;
+	tmp /= rate;
+	tmp /= 2;
+
+	if (!tmp) {
+		dev_err(priv->dev, "computed BCLK divider is zero\n");
+		return -EINVAL;
+	}
+
+	if (tmp > 256) {
+		dev_err(priv->dev, "BCLK divider %llu out of range\n", tmp);
+		return -EINVAL;
+	}
+
+	bclk_div = tmp - 1;
+	val = readl(priv->regs + CV1800B_RXADC_CLK);
+	val = u32_replace_bits(val, bclk_div, REG_RXADC_SCK_DIV);
+	/* Vendor value for 48kHz, tested on SG2000/SG2002 */
+	val = u32_replace_bits(val, 0x19, REG_RXADC_DLYEN);
+	writel(val, priv->regs + CV1800B_RXADC_CLK);
+
+	return 0;
+}
+
+static void cv1800b_adc_enable(struct cv1800b_priv *priv, bool enable)
+{
+	u32 val;
+
+	val = readl(priv->regs + CV1800B_RXADC_CTRL0);
+	val = u32_replace_bits(val, enable, REG_RXADC_EN);
+	val = u32_replace_bits(val, enable, REG_I2S_TX_EN);
+	writel(val, priv->regs + CV1800B_RXADC_CTRL0);
+}
+
+static unsigned int cv1800b_adc_calc_db(u32 ana0, bool right)
+{
+	u32 step_mask = right ? FIELD_GET(REG_GSTEPR_RXPGA, ana0) :
+				FIELD_GET(REG_GSTEPL_RXPGA, ana0);
+	u32 coarse = right ? FIELD_GET(REG_GAINR_RXADC, ana0) :
+			     FIELD_GET(REG_GAINL_RXADC, ana0);
+	bool g6db = right ? FIELD_GET(REG_G6DBR_RXPGA, ana0) :
+			    FIELD_GET(REG_G6DBL_RXPGA, ana0);
+
+	u32 step = step_mask ? __ffs(step_mask) : 0;
+
+	step = min(step, 12U);
+	coarse = min(coarse, 3U);
+
+	return 2 * step + 6 * coarse + (g6db ? 6 : 0);
+}
+
+static int cv1800b_adc_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params,
+				 struct snd_soc_dai *dai)
+{
+	struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate = params_rate(params);
+	u32 val;
+	int ret;
+
+	ret = cv1800b_adc_setbclk_div(priv, rate);
+	if (ret) {
+		dev_err(priv->dev,
+			"could not set rate, check DT node for fixed clock\n");
+		return ret;
+	}
+
+	/* init adc */
+	val = readl(priv->regs + CV1800B_RXADCC_CTRL1);
+	val = u32_replace_bits(val, 1, REG_RXADC_IGR_INIT);
+	val = u32_replace_bits(val, DECIMATION_64, REG_RXADC_CIC_OPT);
+	writel(val, priv->regs + CV1800B_RXADCC_CTRL1);
+	return 0;
+}
+
+static int cv1800b_adc_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+				   struct snd_soc_dai *dai)
+{
+	struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		cv1800b_adc_enable(priv, true);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		cv1800b_adc_enable(priv, false);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cv1800b_adc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+				      unsigned int freq, int dir)
+{
+	struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	priv->mclk_rate = freq;
+	dev_dbg(priv->dev, "mclk is set to %u\n", freq);
+	return 0;
+}
+
+static const struct snd_soc_dai_ops cv1800b_adc_dai_ops = {
+	.hw_params = cv1800b_adc_hw_params,
+	.set_sysclk = cv1800b_adc_dai_set_sysclk,
+	.trigger = cv1800b_adc_dai_trigger,
+};
+
+static struct snd_soc_dai_driver cv1800b_adc_dai = {
+	.name = "adc-hifi",
+	.capture = { .stream_name = "ADC Capture",
+		     .channels_min = 1,
+		     .channels_max = 2,
+		     .rates = SNDRV_PCM_RATE_48000,
+		     .formats = SNDRV_PCM_FMTBIT_S16_LE },
+	.ops = &cv1800b_adc_dai_ops,
+};
+
+static int cv1800b_adc_volume_get(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct cv1800b_priv *priv = snd_soc_component_get_drvdata(component);
+	u32 ana0 = readl(priv->regs + CV1800B_RXADC_ANA0);
+
+	unsigned int left = cv1800b_adc_calc_db(ana0, false);
+	unsigned int right = cv1800b_adc_calc_db(ana0, true);
+
+	ucontrol->value.integer.value[0] = min(left / 2, 24U);
+	ucontrol->value.integer.value[1] = min(right / 2, 24U);
+	return 0;
+}
+
+static int cv1800b_adc_volume_set(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct cv1800b_priv *priv = snd_soc_component_get_drvdata(component);
+
+	u32 v_left = clamp_t(u32, ucontrol->value.integer.value[0], 0, 24);
+	u32 v_right = clamp_t(u32, ucontrol->value.integer.value[1], 0, 24);
+	u32 val;
+
+	val = readl(priv->regs + CV1800B_RXADC_ANA0);
+	val = u32_replace_bits(val, cv1800b_gains[v_left],
+			       REG_COMB_LEFT_VOLUME);
+	val = u32_replace_bits(val, cv1800b_gains[v_right],
+			       REG_COMB_RIGHT_VOLUME);
+	writel(val, priv->regs + CV1800B_RXADC_ANA0);
+
+	return 0;
+}
+
+static DECLARE_TLV_DB_SCALE(cv1800b_volume_tlv, 0, 200, 0);
+
+static const struct snd_kcontrol_new cv1800b_adc_controls[] = {
+	SOC_DOUBLE_EXT_TLV("Internal I2S Capture Volume", SND_SOC_NOPM, 0, 16, 24, false,
+			   cv1800b_adc_volume_get, cv1800b_adc_volume_set,
+			   cv1800b_volume_tlv),
+};
+
+static const struct snd_soc_component_driver cv1800b_adc_component = {
+	.name = "cv1800b-adc-codec",
+	.controls = cv1800b_adc_controls,
+	.num_controls = ARRAY_SIZE(cv1800b_adc_controls),
+};
+
+static int cv1800b_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cv1800b_priv *priv;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->regs))
+		return PTR_ERR(priv->regs);
+
+	platform_set_drvdata(pdev, priv);
+	return devm_snd_soc_register_component(&pdev->dev,
+					       &cv1800b_adc_component,
+					       &cv1800b_adc_dai, 1);
+}
+
+static const struct of_device_id cv1800b_adc_of_match[] = {
+	{ .compatible = "sophgo,cv1800b-sound-adc" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, cv1800b_adc_of_match);
+
+static struct platform_driver cv1800b_adc_driver = {
+	.probe = cv1800b_adc_probe,
+	.driver = {
+		.name = "cv1800b-sound-adc",
+		.of_match_table = cv1800b_adc_of_match,
+	},
+};
+
+module_platform_driver(cv1800b_adc_driver);
+
+MODULE_DESCRIPTION("ADC codec for CV1800B");
+MODULE_AUTHOR("Anton D. Stavinskii <stavinsky@gmail.com>");
+MODULE_LICENSE("GPL");

-- 
2.43.0

[PATCH 5/8] dt-bindings: sound: sophgo: add CV1800B internal DAC codec

[Anton D. Stavinskii]

Document the internal DAC audio codec integrated in the Sophgo
CV1800B SoC.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 .../bindings/sound/sophgo,cv1800b-sound-dac.yaml   | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-dac.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-dac.yaml
new file mode 100644
index 000000000000..2a35e38dc7f9
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-sound-dac.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-sound-dac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800B internal DAC audio codec
+
+maintainers:
+  - Anton D. Stavinskii <stavinsky@gmail.com>
+
+description: |
+  Internal DAC audio codec integrated in the Sophgo CV1800B SoC.
+  The codec exposes a single playback DAI and is intended to be connected to an
+  I2S/TDM controller via an ASoC machine driver.
+
+properties:
+  compatible:
+    const: sophgo,cv1800b-sound-dac
+
+  reg:
+    maxItems: 1
+    description: |
+      Register base address and size of the internal DAC codec register block.
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    audio-codec@300A000  {
+      compatible = "sophgo,cv1800b-sound-dac";
+      #sound-dai-cells = <0>;
+      reg = <0x0300A000 0x100>;
+    };
+...

-- 
2.43.0

[PATCH 6/8] ASoC: sophgo: add CV1800B internal DAC codec driver

[Anton D. Stavinskii]

Codec DAI endpoint for TXDAC + basic controls.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 sound/soc/sophgo/Kconfig             |  11 +-
 sound/soc/sophgo/Makefile            |   1 +
 sound/soc/sophgo/cv1800b-sound-dac.c | 204 +++++++++++++++++++++++++++++++++++
 3 files changed, 215 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sophgo/Kconfig b/sound/soc/sophgo/Kconfig
index 813ab30d6da3..e7c617b44db6 100644
--- a/sound/soc/sophgo/Kconfig
+++ b/sound/soc/sophgo/Kconfig
@@ -23,10 +23,19 @@ config SND_SOC_CV1800B_ADC_CODEC
 	help
 	  This driver provides an ASoC codec DAI for capture and basic
 	  control of the RXADC registers.
-
 	  Say Y or M to build support for the Sophgo CV1800B
 	  internal analog ADC codec block (RXADC).
 	  The module will be called cv1800b-sound-adc
 
+config SND_SOC_CV1800B_DAC_CODEC
+	tristate "Sophgo CV1800B/SG2002 internal DAC codec"
+	depends on SND_SOC
+	help
+	  This driver provides an ASoC codec DAI for playback and basic
+	  control of the TXDAC registers.
+
+	  Say Y or M to build support for the Sophgo CV1800B
+	  internal analog DAC codec block (TXDAC).
+	  The module will be called cv1800b-sound-dac
 
 endmenu
diff --git a/sound/soc/sophgo/Makefile b/sound/soc/sophgo/Makefile
index c654d6059cbd..ec8dd31efddd 100644
--- a/sound/soc/sophgo/Makefile
+++ b/sound/soc/sophgo/Makefile
@@ -2,3 +2,4 @@
 # Sophgo Platform Support
 obj-$(CONFIG_SND_SOC_CV1800B_TDM) += cv1800b-tdm.o
 obj-$(CONFIG_SND_SOC_CV1800B_ADC_CODEC) += cv1800b-sound-adc.o
+obj-$(CONFIG_SND_SOC_CV1800B_DAC_CODEC) += cv1800b-sound-dac.o
diff --git a/sound/soc/sophgo/cv1800b-sound-dac.c b/sound/soc/sophgo/cv1800b-sound-dac.c
new file mode 100644
index 000000000000..ccf386174639
--- /dev/null
+++ b/sound/soc/sophgo/cv1800b-sound-dac.c
@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Internal DAC codec for cv1800b based CPUs
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <sound/soc.h>
+#include <linux/io.h>
+
+#define CV1800B_TXDAC_CTRL0   0x00
+#define CV1800B_TXDAC_CTRL1   0x04
+#define CV1800B_TXDAC_STATUS  0x08
+#define CV1800B_TXDAC_AFE0    0x0c
+#define CV1800B_TXDAC_AFE1    0x10
+#define CV1800B_TXDAC_ANA0    0x20
+#define CV1800B_TXDAC_ANA1    0x24
+#define CV1800B_TXDAC_ANA2    0x28
+
+/* cv1800b_TXDAC_CTRL0 */
+#define REG_TXDAC_EN GENMASK(0, 0)
+#define REG_I2S_RX_EN GENMASK(1, 1)
+
+/* cv1800b_TXDAC_CTRL1 */
+#define REG_TXDAC_CIC_OPT GENMASK(1, 0)
+
+/* cv1800b_TXDAC_AFE0 */
+#define REG_TXDAC_INIT_DLY_CNT GENMASK(5, 0)
+
+/* cv1800b_TXDAC_ANA2 */
+#define TXDAC_OW_VAL_L_MASK GENMASK(7, 0)
+#define TXDAC_OW_VAL_R_MASK GENMASK(15, 8)
+#define TXDAC_OW_EN_L_MASK GENMASK(16, 16)
+#define TXDAC_OW_EN_R_MASK GENMASK(17, 17)
+
+struct cv1800b_priv {
+	void __iomem *regs;
+	struct device *dev;
+};
+
+enum decimation_values {
+	DECIMATION_64 = 0,
+	DECIMATION_128,
+	DECIMATION_256,
+	DECIMATION_512,
+};
+
+static void cv1800b_dac_enable(struct cv1800b_priv *priv, bool enable)
+{
+	u32 val;
+
+	val = readl(priv->regs + CV1800B_TXDAC_CTRL0);
+	val = u32_replace_bits(val, enable, REG_TXDAC_EN);
+	val = u32_replace_bits(val, enable, REG_I2S_RX_EN);
+	writel(val, priv->regs + CV1800B_TXDAC_CTRL0);
+}
+
+static void cv1800b_dac_mute(struct cv1800b_priv *priv, bool enable)
+{
+	u32 val;
+
+	val = readl(priv->regs + CV1800B_TXDAC_ANA2);
+	val = u32_replace_bits(val, enable, TXDAC_OW_EN_L_MASK);
+	val = u32_replace_bits(val, enable, TXDAC_OW_EN_R_MASK);
+	writel(val, priv->regs + CV1800B_TXDAC_ANA2);
+}
+
+static int cv1800b_dac_decimation(struct cv1800b_priv *priv, u8 dec)
+{
+	u32 val;
+
+	if (dec > 3)
+		return -EINVAL;
+
+	val = readl(priv->regs + CV1800B_TXDAC_CTRL1);
+	val = u32_replace_bits(val, dec, REG_TXDAC_CIC_OPT);
+	writel(val, priv->regs + CV1800B_TXDAC_CTRL1);
+	return 0;
+}
+
+static int cv1800b_dac_dly(struct cv1800b_priv *priv, u32 dly)
+{
+	u32 val;
+
+	if (dly > 63)
+		return -EINVAL;
+
+	val = readl(priv->regs + CV1800B_TXDAC_AFE0);
+	val = u32_replace_bits(val, dly, REG_TXDAC_INIT_DLY_CNT);
+	writel(val, priv->regs + CV1800B_TXDAC_AFE0);
+	return 0;
+}
+
+static int cv1800b_dac_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params,
+				 struct snd_soc_dai *dai)
+{
+	struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai);
+	int ret;
+	unsigned int rate = params_rate(params);
+
+	if (rate != 48000) {
+		dev_err(priv->dev, "rate %u is not supported\n", rate);
+		return -EINVAL;
+	}
+
+	cv1800b_dac_mute(priv, false);
+	/* minimal decimation for 48kHz is 64*/
+	ret = cv1800b_dac_decimation(priv, DECIMATION_64);
+	if (ret)
+		return ret;
+
+	/* value is taken from vendors driver 48kHz
+	 * tested on sg2000 and sg2002.
+	 */
+	ret = cv1800b_dac_dly(priv, 0x19);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int cv1800b_dac_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+				   struct snd_soc_dai *dai)
+{
+	struct cv1800b_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		cv1800b_dac_enable(priv, true);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		cv1800b_dac_enable(priv, false);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops cv1800b_dac_dai_ops = {
+	.hw_params = cv1800b_dac_hw_params,
+	.trigger = cv1800b_dac_dai_trigger,
+};
+
+static struct snd_soc_dai_driver cv1800b_dac_dai = {
+	.name = "dac-hifi",
+	.playback = { .stream_name = "DAC Playback",
+		      .channels_min = 2,
+		      .channels_max = 2,
+		      .rates = SNDRV_PCM_RATE_48000,
+		      .formats = SNDRV_PCM_FMTBIT_S16_LE },
+	.ops = &cv1800b_dac_dai_ops,
+};
+
+static const struct snd_soc_component_driver cv1800b_dac_component = {
+	.name = "cv1800b-dac-codec",
+};
+
+static int cv1800b_dac_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cv1800b_priv *priv;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->regs))
+		return PTR_ERR(priv->regs);
+
+	platform_set_drvdata(pdev, priv);
+	return devm_snd_soc_register_component(&pdev->dev,
+					       &cv1800b_dac_component,
+					       &cv1800b_dac_dai, 1);
+}
+
+static const struct of_device_id cv1800b_dac_of_match[] = {
+	{ .compatible = "sophgo,cv1800b-sound-dac" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cv1800b_dac_of_match);
+
+static struct platform_driver cv1800b_dac_driver = {
+	.probe = cv1800b_dac_probe,
+	.driver = {
+		.name = "cv1800b-dac-codec",
+		.of_match_table = cv1800b_dac_of_match,
+	},
+};
+module_platform_driver(cv1800b_dac_driver);
+
+MODULE_DESCRIPTION("DAC codec for CV1800B");
+MODULE_AUTHOR("Anton D. Stavinskii <stavinsky@gmail.com>");
+MODULE_LICENSE("GPL");

-- 
2.43.0

[PATCH 7/8] riscv: dts: sophgo: dts nodes for i2s tdm modules

[Anton D. Stavinskii]

New dts nodes for TDMs and readable DMA names

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 arch/riscv/boot/dts/sophgo/cv180x-dmamux.h | 57 ++++++++++++++++++++++++++++++
 arch/riscv/boot/dts/sophgo/cv180x.dtsi     | 49 +++++++++++++++++++++++++
 2 files changed, 106 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/cv180x-dmamux.h b/arch/riscv/boot/dts/sophgo/cv180x-dmamux.h
new file mode 100644
index 000000000000..6314bf6e9dc8
--- /dev/null
+++ b/arch/riscv/boot/dts/sophgo/cv180x-dmamux.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Copyright (C) 2025 Inochi Amaoto <inochiama@gmail.com>
+ */
+
+#ifndef _SOPHGO_CV18XX_DMAMUX
+#define _SOPHGO_CV18XX_DMAMUX
+
+#define DMA_I2S0_RX		0
+#define DMA_I2S0_TX		1
+#define DMA_I2S1_RX		2
+#define DMA_I2S1_TX		3
+#define DMA_I2S2_RX		4
+#define DMA_I2S2_TX		5
+#define DMA_I2S3_RX		6
+#define DMA_I2S3_TX		7
+#define DMA_UART0_RX	8
+#define DMA_UART0_TX	9
+#define DMA_UART1_RX	10
+#define DMA_UART1_TX	11
+#define DMA_UART2_RX	12
+#define DMA_UART2_TX	13
+#define DMA_UART3_RX	14
+#define DMA_UART3_TX	15
+#define DMA_SPI0_RX		16
+#define DMA_SPI0_TX		17
+#define DMA_SPI1_RX		18
+#define DMA_SPI1_TX		19
+#define DMA_SPI2_RX		20
+#define DMA_SPI2_TX		21
+#define DMA_SPI3_RX		22
+#define DMA_SPI3_TX		23
+#define DMA_I2C0_RX		24
+#define DMA_I2C0_TX		25
+#define DMA_I2C1_RX		26
+#define DMA_I2C1_TX		27
+#define DMA_I2C2_RX		28
+#define DMA_I2C2_TX		29
+#define DMA_I2C3_RX		30
+#define DMA_I2C3_TX		31
+#define DMA_I2C4_RX		32
+#define DMA_I2C4_TX		33
+#define DMA_TDM0_RX		34
+#define DMA_TDM0_TX		35
+#define DMA_TDM1_RX		36
+#define DMA_AUDSRC		37
+#define DMA_SPI_NAND	38
+#define DMA_SPI_NOR		39
+#define DMA_UART4_RX	40
+#define DMA_UART4_TX	41
+#define DMA_SPI_NOR1	42
+
+#define DMA_CPU_A53		0
+#define DMA_CPU_C906_0	1
+#define DMA_CPU_C906_1	2
+
+#endif // _SOPHGO_CV18XX_DMAMUX
diff --git a/arch/riscv/boot/dts/sophgo/cv180x.dtsi b/arch/riscv/boot/dts/sophgo/cv180x.dtsi
index 06b0ce5a2db7..9dd93e028ba9 100644
--- a/arch/riscv/boot/dts/sophgo/cv180x.dtsi
+++ b/arch/riscv/boot/dts/sophgo/cv180x.dtsi
@@ -8,6 +8,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include "cv18xx-reset.h"
+#include "cv180x-dmamux.h"
 
 / {
 	#address-cells = <1>;
@@ -448,6 +449,54 @@ usb: usb@4340000 {
 			status = "disabled";
 		};
 
+		i2s0: i2s@4100000 {
+			compatible = "sophgo,cv1800b-i2s";
+			reg = <0x04100000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&clk CLK_APB_I2S0>, <&clk CLK_SDMA_AUD0>;
+			clock-names = "i2s", "mclk";
+			dmas = <&dmamux DMA_I2S0_RX 1>, <&dmamux DMA_I2S0_TX 1>;
+			dma-names = "rx", "tx";
+			status = "disabled";
+		};
+
+		i2s1: i2s@4110000 {
+			compatible = "sophgo,cv1800b-i2s";
+			reg = <0x04110000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&clk CLK_APB_I2S1>, <&clk CLK_SDMA_AUD1>;
+			clock-names = "i2s", "mclk";
+			dmas = <&dmamux DMA_I2S1_RX 1>, <&dmamux DMA_I2S1_TX 1>;
+			dma-names = "rx", "tx";
+			status = "disabled";
+		};
+
+		i2s2: i2s@4120000 {
+			compatible = "sophgo,cv1800b-i2s";
+			reg = <0x04120000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&clk CLK_APB_I2S2>, <&clk CLK_SDMA_AUD2>;
+			clock-names = "i2s", "mclk";
+			dmas = <&dmamux DMA_I2S2_RX 1>, <&dmamux DMA_I2S2_TX 1>;
+			dma-names = "rx", "tx";
+			status = "disabled";
+		};
+
+		i2s3: i2s@4130000 {
+			compatible = "sophgo,cv1800b-i2s";
+			reg = <0x04130000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&clk CLK_APB_I2S3>, <&clk CLK_SDMA_AUD3>;
+			clock-names = "i2s", "mclk";
+			dmas = <&dmamux DMA_I2S3_RX 1>, <&dmamux DMA_I2S3_TX 1>;
+			dma-names = "rx", "tx";
+			status = "disabled";
+		};
+
 		rtc@5025000 {
 			compatible = "sophgo,cv1800b-rtc", "syscon";
 			reg = <0x5025000 0x2000>;

-- 
2.43.0

[PATCH 8/8] riscv: dts: sophgo: add Milk-V Duo 256M board dts

[Anton D. Stavinskii]

Example of usage internal dac/adc and external I2S mic
The example shows how to use the card and
will actually work other boards.
Fixed clocks needed to make simple card make
initial .set_sysclk with proper clock rates.
Same for DAC. I2S3 has to be started not only
for DAC but for the ADC also because it
provides mclk for both.

dai-link@2 will only work if registers
are set according to this issue
https://github.com/sophgo/sophgo-doc/issues/174#event-21395297524
in other case i2s2 will not output clocks and data.
Those changes are not connected to the driver itself,
but for another subsystem which is not yet ipmlemented.
The following config properly works for MilkV Duo/256Mm, Module.
Basically everything with sg2000/sg2002 but on some boards
i2s2 output pins are soldered to Ethernet module.
In Milk 256M they are free to use as external DAC/ADC.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
---
 arch/riscv/boot/dts/sophgo/Makefile                |   1 +
 .../boot/dts/sophgo/sg2002-milkv-duo-256m.dts      | 231 +++++++++++++++++++++
 2 files changed, 232 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
index 6f65526d4193..c8901ff680cb 100644
--- a/arch/riscv/boot/dts/sophgo/Makefile
+++ b/arch/riscv/boot/dts/sophgo/Makefile
@@ -6,3 +6,4 @@ dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v2.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2044-sophgo-srd3-10.dtb
+dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-milkv-duo-256m.dtb
diff --git a/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
new file mode 100644
index 000000000000..cc33c4355969
--- /dev/null
+++ b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2024 Thomas Bonnefille <thomas.bonnefille@bootlin.com>
+ */
+
+/dts-v1/;
+
+#include "sg2002.dtsi"
+
+/ {
+	model = "Milk-V duo 256M";
+	compatible = "milkv,duo-256m",
+	"sipeed,licheerv-nano",
+	"sophgo,sg2002";
+
+	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+		serial4 = &uart4;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&osc {
+	clock-frequency = <25000000>;
+};
+
+&pinctrl {
+	uart0_cfg: uart0-cfg {
+		uart0-pins {
+			pinmux = <PINMUX(PIN_UART0_TX, 0)>,
+			<PINMUX(PIN_UART0_RX, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+	};
+
+	sdhci0_cfg: sdhci0-cfg {
+		sdhci0-clk-pins {
+			pinmux = <PINMUX(PIN_SD0_CLK, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <16100>;
+			power-source = <3300>;
+		};
+
+		sdhci0-cmd-pins {
+			pinmux = <PINMUX(PIN_SD0_CMD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		sdhci0-data-pins {
+			pinmux = <PINMUX(PIN_SD0_D0, 0)>,
+			<PINMUX(PIN_SD0_D1, 0)>,
+			<PINMUX(PIN_SD0_D2, 0)>,
+			<PINMUX(PIN_SD0_D3, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		sdhci0-cd-pins {
+			pinmux = <PINMUX(PIN_SD0_CD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+	};
+};
+
+&sdhci0 {
+	pinctrl-0 = <&sdhci0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+	bus-width = <4>;
+	no-1-8-v;
+	no-mmc;
+	no-sdio;
+	disable-wp;
+};
+
+&usb {
+	dr_mode = "peripheral";
+	status = "okay";
+	g-rx-fifo-size = <1536>;
+	g-tx-fifo-size = <128 128 64 64 64 64 32 32>;
+};
+
+&uart0 {
+	pinctrl-0 = <&uart0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&dmac {
+	status = "okay";
+};
+
+&dmamux {
+	status = "okay";
+};
+
+&pinctrl {
+	i2s2_cfg: i2s2-cfg {
+		i2s2-out-pins {
+			pinmux = <PINMUX(PIN_ETH_TXM, 7)>,
+			<PINMUX(PIN_ETH_RXP,  7)>,
+			<PINMUX(PIN_ETH_RXM,  7)>;
+
+			drive-strength-microamp = <15700>;
+			power-source = <1800>;
+		};
+
+		i2s2-in-pins {
+			pinmux = <PINMUX(PIN_ETH_TXP, 7)>;
+			power-source = <1800>;
+		};
+	};
+};
+
+&i2s0 {
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
+&i2s2 {
+	pinctrl-0 = <&i2s2_cfg>;
+	pinctrl-names = "default";
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
+&i2s3 {
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
+/ {
+	int_adc: codec@300a100 {
+		compatible = "sophgo,cv1800b-sound-adc";
+		#sound-dai-cells = <0>;
+		reg = <0x300a100 0x100>;
+	};
+
+	int_dac: codec@300a000 {
+		compatible = "sophgo,cv1800b-sound-dac";
+		#sound-dai-cells = <0>;
+		reg = <0x300a000 0x100>;
+	};
+
+	ext_adc: my-ext-adc {
+		compatible = "invensense,ics43432";
+		#sound-dai-cells = <0>;
+	};
+
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "cv1800b card";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		simple-audio-card,dai-link@0 {
+			reg = <0>;
+			format = "i2s";
+			bitclock-master = <&clock_master0>;
+			frame-master = <&clock_master0>;
+
+			codec {
+				sound-dai = <&int_dac>;
+			};
+
+			clock_master0: cpu {
+				system-clock-frequency = <12288000>;
+				system-clock-fixed;
+				system-clock-direction-out;
+				mclk-fs = <256>;
+				sound-dai = <&i2s3>;
+			};
+		};
+
+		simple-audio-card,dai-link@1 {
+			reg = <1>;
+			format = "i2s";
+			bitclock-master = <&clock_master1>;
+			frame-master = <&clock_master1>;
+
+			clock_master1: codec {
+				mclk-fs = <256>;
+				system-clock-frequency = <12288000>;
+				system-clock-fixed;
+				sound-dai = <&int_adc>;
+			};
+
+			cpu {
+				mclk-fs = <256>;
+				system-clock-frequency = <12288000>;
+				system-clock-fixed;
+				sound-dai = <&i2s0>;
+			};
+		};
+
+		simple-audio-card,dai-link@2 {
+			reg = <2>;
+			format = "i2s";
+			bitclock-master = <&clock_master2>;
+			frame-master = <&clock_master2>;
+
+			codec {
+				sound-dai = <&ext_adc>;
+			};
+
+			clock_master2: cpu {
+				mclk-fs = <256>;
+				system-clock-frequency = <12288000>;
+				system-clock-fixed;
+				sound-dai = <&i2s2>;
+			};
+		};
+	};
+};

-- 
2.43.0

Re: [PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

[Inochi Amaoto]

On Thu, Jan 15, 2026 at 11:17:37PM +0400, Anton D. Stavinskii wrote:
> This patch series adds basic audio support for Sophgo CV1800B, 
> as used on boards such as the Milk-V Duo. 
> The series introduces an AIAO audio mux driver, 
> an I2S controller driver, corresponding DT bindings, 
> and DTS updates to wire the components together.
> 

I haven't see your mux driver, is it missed?

> The implementation is based on vendor documentation 
> and testing on real hardware.  This series relies on 
> recent fixes in the DesignWare AXI DMA support; 
> in particular, correct operation depends on 
> the DMA changes discussed at:
> https://lore.kernel.org/all/20251214224601.598358-1-inochiama@gmail.com/ 
> The current driver implementation supports a fixed audio configuration 
> of 48 kHz sample rate.  The series has been tested on the 
> Milk-V Duo 256M board using the Sophgo SG2002 SoC. 
> The implementation is expected to also work on Milk-V Duo and Milk-V Module 
> boards based on the SG2000 SoC, as the audio 
> and DMA blocks are closely related.
> 
> Known hardware limitation:
> On CV1800B / SG2002, the I2S2 output pins cannot be enabled via pinctrl alone.
> Due to SoC design constraints, the output path becomes functional only after 
> additional vendor-specific register programming. 
> This series makes the limitation explicit and does not attempt to work around 
> it implicitly via pinctrl or undocumented behavior.
> 
> Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
> ---
> Anton D. Stavinskii (8):
>       dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding
>       ASoC: sophgo: add CV1800B I2S/TDM controller driver
>       dt-bindings: sound: sophgo: add CV1800B internal ADC codec
>       ASoC: sophgo: add CV1800B internal ADC codec driver
>       dt-bindings: sound: sophgo: add CV1800B internal DAC codec
>       ASoC: sophgo: add CV1800B internal DAC codec driver
>       riscv: dts: sophgo: dts nodes for i2s tdm modules
>       riscv: dts: sophgo: add Milk-V Duo 256M board dts
> 
>  .../bindings/sound/sophgo,cv1800b-i2s.yaml         |  75 +++
>  .../bindings/sound/sophgo,cv1800b-sound-adc.yaml   |  43 ++
>  .../bindings/sound/sophgo,cv1800b-sound-dac.yaml   |  43 ++
>  arch/riscv/boot/dts/sophgo/Makefile                |   1 +
>  arch/riscv/boot/dts/sophgo/cv180x-dmamux.h         |  57 ++
>  arch/riscv/boot/dts/sophgo/cv180x.dtsi             |  49 ++
>  .../boot/dts/sophgo/sg2002-milkv-duo-256m.dts      | 231 +++++++
>  sound/soc/Kconfig                                  |   1 +
>  sound/soc/Makefile                                 |   1 +
>  sound/soc/sophgo/Kconfig                           |  41 ++
>  sound/soc/sophgo/Makefile                          |   5 +
>  sound/soc/sophgo/cv1800b-sound-adc.c               | 322 ++++++++++
>  sound/soc/sophgo/cv1800b-sound-dac.c               | 204 ++++++
>  sound/soc/sophgo/cv1800b-tdm.c                     | 714 +++++++++++++++++++++
>  14 files changed, 1787 insertions(+)
> ---
> base-commit: 7a52965b6976c936f413eebeee3f78c6faf09012
> change-id: 20260115-cv1800b-i2s-driver-4f17836dec56
> 
> Best regards,
> -- 
> Anton D. Stavinskii <stavinsky@gmail.com>
> 

Thanks for your patch, for all the patchs, I hope you write a
meaningful comment for the patch, at least for now I found it
is nothing in your comment.

Also, the patch 8 should not in this patch and should be a
separate patch.

Regards,
Inochi

Re: [PATCH 8/8] riscv: dts: sophgo: add Milk-V Duo 256M board dts

[Inochi Amaoto]

On Thu, Jan 15, 2026 at 11:17:45PM +0400, Anton D. Stavinskii wrote:
> Example of usage internal dac/adc and external I2S mic
> The example shows how to use the card and
> will actually work other boards.
> Fixed clocks needed to make simple card make
> initial .set_sysclk with proper clock rates.
> Same for DAC. I2S3 has to be started not only
> for DAC but for the ADC also because it
> provides mclk for both.
> 
> dai-link@2 will only work if registers
> are set according to this issue
> https://github.com/sophgo/sophgo-doc/issues/174#event-21395297524
> in other case i2s2 will not output clocks and data.
> Those changes are not connected to the driver itself,
> but for another subsystem which is not yet ipmlemented.
> The following config properly works for MilkV Duo/256Mm, Module.
> Basically everything with sg2000/sg2002 but on some boards
> i2s2 output pins are soldered to Ethernet module.
> In Milk 256M they are free to use as external DAC/ADC.
> 
> Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
> ---
>  arch/riscv/boot/dts/sophgo/Makefile                |   1 +
>  .../boot/dts/sophgo/sg2002-milkv-duo-256m.dts      | 231 +++++++++++++++++++++
>  2 files changed, 232 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 6f65526d4193..c8901ff680cb 100644
> --- a/arch/riscv/boot/dts/sophgo/Makefile
> +++ b/arch/riscv/boot/dts/sophgo/Makefile
> @@ -6,3 +6,4 @@ dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v2.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2044-sophgo-srd3-10.dtb
> +dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-milkv-duo-256m.dtb
> diff --git a/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
> new file mode 100644
> index 000000000000..cc33c4355969
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
> @@ -0,0 +1,231 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2024 Thomas Bonnefille <thomas.bonnefille@bootlin.com>
> + */
> +
> +/dts-v1/;
> +
> +#include "sg2002.dtsi"
> +
> +/ {
> +	model = "Milk-V duo 256M";
> +	compatible = "milkv,duo-256m",
> +	"sipeed,licheerv-nano",
> +	"sophgo,sg2002";
> +
> +	aliases {
> +		gpio0 = &gpio0;
> +		gpio1 = &gpio1;
> +		gpio2 = &gpio2;
> +		gpio3 = &gpio3;
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +		serial4 = &uart4;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&osc {
> +	clock-frequency = <25000000>;
> +};
> +
> +&pinctrl {
> +	uart0_cfg: uart0-cfg {
> +		uart0-pins {
> +			pinmux = <PINMUX(PIN_UART0_TX, 0)>,
> +			<PINMUX(PIN_UART0_RX, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <10800>;
> +			power-source = <3300>;
> +		};
> +	};
> +
> +	sdhci0_cfg: sdhci0-cfg {
> +		sdhci0-clk-pins {
> +			pinmux = <PINMUX(PIN_SD0_CLK, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <16100>;
> +			power-source = <3300>;
> +		};
> +
> +		sdhci0-cmd-pins {
> +			pinmux = <PINMUX(PIN_SD0_CMD, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <10800>;
> +			power-source = <3300>;
> +		};
> +
> +		sdhci0-data-pins {
> +			pinmux = <PINMUX(PIN_SD0_D0, 0)>,
> +			<PINMUX(PIN_SD0_D1, 0)>,
> +			<PINMUX(PIN_SD0_D2, 0)>,
> +			<PINMUX(PIN_SD0_D3, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <10800>;
> +			power-source = <3300>;
> +		};
> +
> +		sdhci0-cd-pins {
> +			pinmux = <PINMUX(PIN_SD0_CD, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <10800>;
> +			power-source = <3300>;
> +		};
> +	};
> +};
> +
> +&sdhci0 {
> +	pinctrl-0 = <&sdhci0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +	bus-width = <4>;
> +	no-1-8-v;
> +	no-mmc;
> +	no-sdio;
> +	disable-wp;
> +};
> +
> +&usb {
> +	dr_mode = "peripheral";
> +	status = "okay";
> +	g-rx-fifo-size = <1536>;
> +	g-tx-fifo-size = <128 128 64 64 64 64 32 32>;
> +};
> +
> +&uart0 {
> +	pinctrl-0 = <&uart0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
> +&dmac {
> +	status = "okay";
> +};
> +
> +&dmamux {
> +	status = "okay";
> +};
> +
> +&pinctrl {
> +	i2s2_cfg: i2s2-cfg {
> +		i2s2-out-pins {
> +			pinmux = <PINMUX(PIN_ETH_TXM, 7)>,
> +			<PINMUX(PIN_ETH_RXP,  7)>,
> +			<PINMUX(PIN_ETH_RXM,  7)>;
> +
> +			drive-strength-microamp = <15700>;
> +			power-source = <1800>;
> +		};
> +
> +		i2s2-in-pins {
> +			pinmux = <PINMUX(PIN_ETH_TXP, 7)>;
> +			power-source = <1800>;
> +		};
> +	};
> +};
> +
> +&i2s0 {
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +&i2s2 {
> +	pinctrl-0 = <&i2s2_cfg>;
> +	pinctrl-names = "default";
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +&i2s3 {
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +/ {

> +	int_adc: codec@300a100 {
> +		compatible = "sophgo,cv1800b-sound-adc";
> +		#sound-dai-cells = <0>;
> +		reg = <0x300a100 0x100>;
> +	};
> +
> +	int_dac: codec@300a000 {
> +		compatible = "sophgo,cv1800b-sound-dac";
> +		#sound-dai-cells = <0>;
> +		reg = <0x300a000 0x100>;
> +	};
> +

Move these two nodes into cv180x.dtsi, others are not allowed
in this patch series, use a separate patch instead.

Regards,
Inochi


> +	ext_adc: my-ext-adc {
> +		compatible = "invensense,ics43432";
> +		#sound-dai-cells = <0>;
> +	};
> +
> +	sound {
> +		compatible = "simple-audio-card";
> +		simple-audio-card,name = "cv1800b card";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		simple-audio-card,dai-link@0 {
> +			reg = <0>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master0>;
> +			frame-master = <&clock_master0>;
> +
> +			codec {
> +				sound-dai = <&int_dac>;
> +			};
> +
> +			clock_master0: cpu {
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				system-clock-direction-out;
> +				mclk-fs = <256>;
> +				sound-dai = <&i2s3>;
> +			};
> +		};
> +
> +		simple-audio-card,dai-link@1 {
> +			reg = <1>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master1>;
> +			frame-master = <&clock_master1>;
> +
> +			clock_master1: codec {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&int_adc>;
> +			};
> +
> +			cpu {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&i2s0>;
> +			};
> +		};
> +
> +		simple-audio-card,dai-link@2 {
> +			reg = <2>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master2>;
> +			frame-master = <&clock_master2>;
> +
> +			codec {
> +				sound-dai = <&ext_adc>;
> +			};
> +
> +			clock_master2: cpu {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&i2s2>;
> +			};
> +		};
> +	};
> +};
> 
> -- 
> 2.43.0
> 

Re: [PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

[Anton D. Stavinskii]

> On Thu, Jan 15, 2026 at 11:17:37PM +0400, Anton D. Stavinskii wrote:
> > This patch series adds basic audio support for Sophgo CV1800B, 
> > as used on boards such as the Milk-V Duo. 
> > The series introduces an AIAO audio mux driver, 
> > an I2S controller driver, corresponding DT bindings, 
> > and DTS updates to wire the components together.
> > 
> 
> I haven't see your mux driver, is it missed?

That was bad copy paste from original version. 
Thanks for noticing this. Will update the cover letter.
I want to not overcomplicate already big patch series.
So multiplexing will be done later. 
> 

> Thanks for your patch, for all the patchs, I hope you write a
> meaningful comment for the patch, at least for now I found it
> is nothing in your comment.

Thank you for a great help with that series. Do you mean
I need to add more meaningful comments for each commit or the 
cover letter is not describing everything clear enough? 
Anyway will do my best in the second version. 
> 
> Also, the patch 8 should not in this patch and should be a
> separate patch.

Yes I've missed this thing. I will remove the last commit 
and move codecs nodes to the base dtsi file. 

Re: [PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

[Inochi Amaoto]

On Fri, Jan 16, 2026 at 09:25:51PM +0400, Anton D. Stavinskii wrote:
> > On Thu, Jan 15, 2026 at 11:17:37PM +0400, Anton D. Stavinskii wrote:
> > > This patch series adds basic audio support for Sophgo CV1800B, 
> > > as used on boards such as the Milk-V Duo. 
> > > The series introduces an AIAO audio mux driver, 
> > > an I2S controller driver, corresponding DT bindings, 
> > > and DTS updates to wire the components together.
> > > 
> > 
> > I haven't see your mux driver, is it missed?
> 
> That was bad copy paste from original version. 
> Thanks for noticing this. Will update the cover letter.
> I want to not overcomplicate already big patch series.
> So multiplexing will be done later. 
> > 
> 
> > Thanks for your patch, for all the patchs, I hope you write a
> > meaningful comment for the patch, at least for now I found it
> > is nothing in your comment.
> 
> Thank you for a great help with that series. Do you mean
> I need to add more meaningful comments for each commit or the 
> cover letter is not describing everything clear enough? 
> Anyway will do my best in the second version. 

For each commit, the cover letter is OK.

Regards,
Inochi

> > 
> > Also, the patch 8 should not in this patch and should be a
> > separate patch.
> 
> Yes I've missed this thing. I will remove the last commit 
> and move codecs nodes to the base dtsi file. 
> 

Re: [PATCH 1/8] dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding

[Rob Herring]

On Thu, Jan 15, 2026 at 11:17:38PM +0400, Anton D. Stavinskii wrote:
> Purpose: introduce DT schema for the CPU driver

Please write a better commit msg. Use complete sentences for starters.

> 
> Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
> ---
>  .../bindings/sound/sophgo,cv1800b-i2s.yaml         | 75 ++++++++++++++++++++++
>  1 file changed, 75 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
> new file mode 100644
> index 000000000000..cf30880a62da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-i2s.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-i2s.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV1800B I2S/TDM controller
> +
> +maintainers:
> +  - Anton D. Stavinskii <stavinsky@gmail.com>
> +
> +description: |

Don't need '|' if no formatting.

> +  I2S/TDM controller found in CV1800B / Sophgo SG2002/SG2000 SoCs.
> +
> +properties:
> +  compatible:
> +    const: sophgo,cv1800b-i2s
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#sound-dai-cells":
> +    const: 0
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: i2s
> +      - const: mclk
> +
> +  dmas:
> +    maxItems: 2

dma-names allows 1 entry, but this requires 2?

> +
> +  dma-names:
> +    description: |
> +      Names of DMA channels. May be omitted. If present, one entry
> +      selects a single direction, while two entries select RX and TX.

Drop the first 2 sentences.

> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      enum: [rx, tx]
> +

> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0

What are these for? You don't have any child nodes with addresses.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - "#sound-dai-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/sophgo,cv1800.h>
> +
> +    i2s1: i2s@4110000 {

Drop unused label.

> +        compatible = "sophgo,cv1800b-i2s";
> +        reg = <0x04110000 0x10000>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        clocks = <&clk CLK_APB_I2S1>,  <&clk CLK_SDMA_AUD1>;
> +        clock-names = "i2s", "mclk";
> +        dmas = <&dmamux 2 1>, <&dmamux 3 1>;
> +        dma-names = "rx", "tx";
> +    };
> +...
> 
> -- 
> 2.43.0
> 

Re: [PATCH 1/8] dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding

[Anton D. Stavinskii]

On Wed, Jan 21, 2026 at 10:32:13AM +0400, Rob Herring wrote:
> On Thu, Jan 15, 2026 at 11:17:38PM +0400, Anton D. Stavinskii wrote:
> > Purpose: introduce DT schema for the CPU driver
> 
> Please write a better commit msg. Use complete sentences for starters.

Thank you for the review. But I'm afraid this is initial version of the
file. The current version 4 is here
https://lore.kernel.org/all/20260120-cv1800b-i2s-driver-v4-1-6ef787dc6426@gmail.com/
Hope everything from what you said is already fixed. Big thanks to
Krzysztof for reviewing, help and patience.