[PATCH v10 0/3] ASoC: rt5575: Add the codec driver for the ALC5575

[PATCH v10 0/3] ASoC: rt5575: Add the codec driver for the ALC5575

[Oder Chiou]

Hi all,

This patch series adds support for the Realtek ALC5575 audio codec.

Changes in v10:
- Patch 1/3:
  - export of_find_spi_controller_by_node()
- Patch 2/3:
  - remove realtek,rt5575-use-spi
  - add spi-parent for firmware-loading
- Patch 3/3:
  - use of_find_spi_controller_by_node() to get the SPI controller and add
    the spi device for firmware-loading

Changes in v9:
- Patch 1/2:
  - modify the comment
  - change the compatible name to "realtek,rt5575-use-spi"
- Patch 2/2:
  - remove the standalone rt5575_spi_driver module and integrate its
    functionality into the I2C driver
  - move the SPI firmware-loading function to rt5575-spi.c
  - use the match data to distinguish between w/wo flash
  - minor fixes
- Link to v9: https://lore.kernel.org/all/20251211110130.2925541-1-oder_chiou@realtek.com/

Changes in v8:
- Patch 1/2:
  - remove the variable rt5575_spi_ready
  - use the multiple compatible names to distinguish between w/wo flash
- Patch 2/2:
  - add compatible enum "realtek,rt5575-with-spi"
- Link to v8: https://lore.kernel.org/all/20251201105926.1714341-1-oder_chiou@realtek.com/

Changes in v7:
- Patch 1/2:
  - add a caption for the tristates
  - remove the redundant enum of the SPI command
  - add the error log in the request firmware failure
  - change the function name rt5575_spi_fw_loaded to rt5575_fw_load_by_spi
  - minor fixes
- Patch 2/2:
  - modify commit message
- Link to v7: https://lore.kernel.org/all/20251121084112.743518-1-oder_chiou@realtek.com/

Changes in v6:
- Patch 1/2:
  - modify commit message
  - add select SND_SOC_RT5575 to config SND_SOC_RT5575_SPI in the Kconfig
  - revise the boiler plate in the head of the file
  - sort the include files
  - use a structure to transfer the spi data
  - use the poll() related function instead the for-loop
  - revise the UUID to the private ID
  - minor fixes
- Patch 2/2:
  - modify description
- Link to v6: https://lore.kernel.org/all/20251031073245.3629060-1-oder_chiou@realtek.com/

Changes in v2 to v5:
- Patch 1/2:
  - move the firmware to the subdirectory
  - remove the empty functions
  - remove the cache_type in the regmap_config
  - add the error log in the run firmware failure
- Patch 2/2:
  - nothing
- Link to v5: https://lore.kernel.org/all/20251015103404.3075684-1-oder_chiou@realtek.com/

Oder Chiou (3):
  spi: export of_find_spi_controller_by_node()
  ASoC: dt-bindings: realtek,rt5575: add support for ALC5575
  ASoC: rt5575: Add the codec driver for the ALC5575

 .../bindings/sound/realtek,rt5575.yaml        |  61 +++
 drivers/spi/spi.c                             |   3 +-
 include/linux/spi/spi.h                       |  11 +
 sound/soc/codecs/Kconfig                      |  10 +
 sound/soc/codecs/Makefile                     |   3 +
 sound/soc/codecs/rt5575-spi.c                 | 119 ++++++
 sound/soc/codecs/rt5575-spi.h                 |  26 ++
 sound/soc/codecs/rt5575.c                     | 359 ++++++++++++++++++
 sound/soc/codecs/rt5575.h                     |  54 +++
 9 files changed, 645 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/sound/realtek,rt5575.yaml
 create mode 100644 sound/soc/codecs/rt5575-spi.c
 create mode 100644 sound/soc/codecs/rt5575-spi.h
 create mode 100644 sound/soc/codecs/rt5575.c
 create mode 100644 sound/soc/codecs/rt5575.h

-- 
2.52.0

[PATCH v10 1/3] spi: export of_find_spi_controller_by_node()

[Oder Chiou]

Some devices are primarily described on another bus (e.g. I2C) but also
have an additional SPI connection that serves as a transport for
firmware loading. Export of_find_spi_controller_by_node() so drivers can
obtain the SPI controller referenced by a DT phandle.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
---
 drivers/spi/spi.c       |  3 ++-
 include/linux/spi/spi.h | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e25df9990f82..ecb5281b04a2 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -4771,7 +4771,7 @@ static struct spi_device *of_find_spi_device_by_node(struct device_node *node)
 }
 
 /* The spi controllers are not using spi_bus, so we find it with another way */
-static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
+struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
 {
 	struct device *dev;
 
@@ -4784,6 +4784,7 @@ static struct spi_controller *of_find_spi_controller_by_node(struct device_node
 	/* Reference got in class_find_device */
 	return container_of(dev, struct spi_controller, dev);
 }
+EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node);
 
 static int of_spi_notify(struct notifier_block *nb, unsigned long action,
 			 void *arg)
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index cb2c2df31089..1eb04a96cc1c 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -882,6 +882,17 @@ extern int devm_spi_register_controller(struct device *dev,
 					struct spi_controller *ctlr);
 extern void spi_unregister_controller(struct spi_controller *ctlr);
 
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
+extern struct spi_controller *of_find_spi_controller_by_node(
+	struct device_node *node);
+#else
+static inline struct spi_controller *of_find_spi_controller_by_node(
+	struct device_node *node)
+{
+	return NULL;
+}
+#endif
+
 #if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SPI_MASTER)
 extern struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);
 extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
-- 
2.52.0

Re: [PATCH v10 1/3] spi: export of_find_spi_controller_by_node()

[Cezary Rojewski]

On 2025-12-16 8:18 AM, Oder Chiou wrote:
> Some devices are primarily described on another bus (e.g. I2C) but also
> have an additional SPI connection that serves as a transport for
> firmware loading. Export of_find_spi_controller_by_node() so drivers can
> obtain the SPI controller referenced by a DT phandle.

One nitpick below, otherwise looks good.

Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>

> 
> Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
> ---
>   drivers/spi/spi.c       |  3 ++-
>   include/linux/spi/spi.h | 11 +++++++++++
>   2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index e25df9990f82..ecb5281b04a2 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -4771,7 +4771,7 @@ static struct spi_device *of_find_spi_device_by_node(struct device_node *node)
>   }
>   
>   /* The spi controllers are not using spi_bus, so we find it with another way */
> -static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
> +struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
>   {
>   	struct device *dev;
>   
> @@ -4784,6 +4784,7 @@ static struct spi_controller *of_find_spi_controller_by_node(struct device_node
>   	/* Reference got in class_find_device */
>   	return container_of(dev, struct spi_controller, dev);
>   }
> +EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node);
>   
>   static int of_spi_notify(struct notifier_block *nb, unsigned long action,
>   			 void *arg)
> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index cb2c2df31089..1eb04a96cc1c 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -882,6 +882,17 @@ extern int devm_spi_register_controller(struct device *dev,
>   					struct spi_controller *ctlr);
>   extern void spi_unregister_controller(struct spi_controller *ctlr);
>   
> +#if IS_ENABLED(CONFIG_OF_DYNAMIC)
> +extern struct spi_controller *of_find_spi_controller_by_node(
> +	struct device_node *node);
> +#else
> +static inline struct spi_controller *of_find_spi_controller_by_node(
> +	struct device_node *node)

For both declarations, just make them one-liners. Fits the limit, even 
for the inliner case:

static inline struct spi_controller 
*of_find_spi_controller_by_node(struct device_node *node)

> +{
> +	return NULL;
> +}
> +#endif
> +
>   #if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SPI_MASTER)
>   extern struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);
>   extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,

Re: [PATCH v10 1/3] spi: export of_find_spi_controller_by_node()

[Rob Herring]

On Tue, Dec 16, 2025 at 03:18:51PM +0800, Oder Chiou wrote:
> Some devices are primarily described on another bus (e.g. I2C) but also
> have an additional SPI connection that serves as a transport for
> firmware loading. Export of_find_spi_controller_by_node() so drivers can
> obtain the SPI controller referenced by a DT phandle.
> 
> Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
> ---
>  drivers/spi/spi.c       |  3 ++-
>  include/linux/spi/spi.h | 11 +++++++++++
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index e25df9990f82..ecb5281b04a2 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -4771,7 +4771,7 @@ static struct spi_device *of_find_spi_device_by_node(struct device_node *node)
>  }
>  
>  /* The spi controllers are not using spi_bus, so we find it with another way */
> -static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
> +struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
>  {
>  	struct device *dev;
>  
> @@ -4784,6 +4784,7 @@ static struct spi_controller *of_find_spi_controller_by_node(struct device_node
>  	/* Reference got in class_find_device */
>  	return container_of(dev, struct spi_controller, dev);
>  }
> +EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node);
>  
>  static int of_spi_notify(struct notifier_block *nb, unsigned long action,
>  			 void *arg)
> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index cb2c2df31089..1eb04a96cc1c 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -882,6 +882,17 @@ extern int devm_spi_register_controller(struct device *dev,
>  					struct spi_controller *ctlr);
>  extern void spi_unregister_controller(struct spi_controller *ctlr);
>  
> +#if IS_ENABLED(CONFIG_OF_DYNAMIC)

This has nothing to do with CONFIG_OF_DYNAMIC. CONFIG_OF is what you 
want, and there's probably a section for that already.

> +extern struct spi_controller *of_find_spi_controller_by_node(
> +	struct device_node *node);
> +#else
> +static inline struct spi_controller *of_find_spi_controller_by_node(
> +	struct device_node *node)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  #if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SPI_MASTER)
>  extern struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);
>  extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
> -- 
> 2.52.0
> 

[PATCH v10 2/3] ASoC: dt-bindings: realtek,rt5575: add support for ALC5575

[Oder Chiou]

Audio codec with I2S, I2C and SPI.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
---
 .../bindings/sound/realtek,rt5575.yaml        | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/realtek,rt5575.yaml

diff --git a/Documentation/devicetree/bindings/sound/realtek,rt5575.yaml b/Documentation/devicetree/bindings/sound/realtek,rt5575.yaml
new file mode 100644
index 000000000000..981ebc39b195
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/realtek,rt5575.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/realtek,rt5575.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ALC5575 audio CODEC
+
+maintainers:
+  - Oder Chiou <oder_chiou@realtek.com>
+
+description:
+  The device supports both I2C and SPI. I2C is mandatory, while SPI is
+  optional depending on the hardware configuration. SPI is used for
+  firmware loading if present.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: realtek,rt5575
+
+  reg:
+    maxItems: 1
+
+  spi-parent:
+    description:
+      Optional phandle reference to the SPI controller used for firmware
+      loading. The argument specifies the chip select.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  # I2C-only node
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        codec@57 {
+            compatible = "realtek,rt5575";
+            reg = <0x57>;
+        };
+    };
+
+  # I2C + optional SPI node
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        codec@57 {
+            compatible = "realtek,rt5575";
+            reg = <0x57>;
+            spi-parent = <&spi0 0>; /* chip-select 0 */
+        };
+    };
-- 
2.52.0

Re: [PATCH v10 2/3] ASoC: dt-bindings: realtek,rt5575: add support for ALC5575

[Rob Herring (Arm)]

On Tue, 16 Dec 2025 15:18:52 +0800, Oder Chiou wrote:
> Audio codec with I2S, I2C and SPI.
> 
> Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
> ---
>  .../bindings/sound/realtek,rt5575.yaml        | 61 +++++++++++++++++++
>  1 file changed, 61 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/realtek,rt5575.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

[PATCH v10 3/3] ASoC: rt5575: Add the codec driver for the ALC5575

[Oder Chiou]

The ALC5575 integrates an audio DSP that typically loads its firmware
from an external flash via its own SPI host interface. In certain
hardware configurations, the firmware can alternatively be loaded
through the SPI client interface. The driver provides basic mute and
volume control functions. When the SPI client interface is enabled,
firmware loading is handled by the SPI driver.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
---
 sound/soc/codecs/Kconfig      |  10 +
 sound/soc/codecs/Makefile     |   3 +
 sound/soc/codecs/rt5575-spi.c | 119 +++++++++++
 sound/soc/codecs/rt5575-spi.h |  26 +++
 sound/soc/codecs/rt5575.c     | 359 ++++++++++++++++++++++++++++++++++
 sound/soc/codecs/rt5575.h     |  54 +++++
 6 files changed, 571 insertions(+)
 create mode 100644 sound/soc/codecs/rt5575-spi.c
 create mode 100644 sound/soc/codecs/rt5575-spi.h
 create mode 100644 sound/soc/codecs/rt5575.c
 create mode 100644 sound/soc/codecs/rt5575.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 061791e61907..14f3d09e7117 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -212,6 +212,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_RT1305
 	imply SND_SOC_RT1308
 	imply SND_SOC_RT5514
+	imply SND_SOC_RT5575
 	imply SND_SOC_RT5616
 	imply SND_SOC_RT5631
 	imply SND_SOC_RT5640
@@ -1783,6 +1784,15 @@ config SND_SOC_RT5514_SPI_BUILTIN
 	bool # force RT5514_SPI to be built-in to avoid link errors
 	default SND_SOC_RT5514=y && SND_SOC_RT5514_SPI=m
 
+config SND_SOC_RT5575
+	tristate "Realtek ALC5575 Codec - I2C"
+	depends on I2C
+
+config SND_SOC_RT5575_SPI
+	tristate "Realtek ALC5575 Codec - SPI"
+	depends on SPI_MASTER && I2C
+	depends on SND_SOC_RT5575
+
 config SND_SOC_RT5616
 	tristate "Realtek RT5616 CODEC"
 	depends on I2C
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index d687d4f74363..a6406bc907a9 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -253,6 +253,8 @@ snd-soc-rt286-y := rt286.o
 snd-soc-rt298-y := rt298.o
 snd-soc-rt5514-y := rt5514.o
 snd-soc-rt5514-spi-y := rt5514-spi.o
+snd-soc-rt5575-y := rt5575.o
+snd-soc-rt5575-$(CONFIG_SND_SOC_RT5575_SPI) += rt5575-spi.o
 snd-soc-rt5616-y := rt5616.o
 snd-soc-rt5631-y := rt5631.o
 snd-soc-rt5640-y := rt5640.o
@@ -686,6 +688,7 @@ obj-$(CONFIG_SND_SOC_RT298)	+= snd-soc-rt298.o
 obj-$(CONFIG_SND_SOC_RT5514)	+= snd-soc-rt5514.o
 obj-$(CONFIG_SND_SOC_RT5514_SPI)	+= snd-soc-rt5514-spi.o
 obj-$(CONFIG_SND_SOC_RT5514_SPI_BUILTIN)	+= snd-soc-rt5514-spi.o
+obj-$(CONFIG_SND_SOC_RT5575)	+= snd-soc-rt5575.o
 obj-$(CONFIG_SND_SOC_RT5616)	+= snd-soc-rt5616.o
 obj-$(CONFIG_SND_SOC_RT5631)	+= snd-soc-rt5631.o
 obj-$(CONFIG_SND_SOC_RT5640)	+= snd-soc-rt5640.o
diff --git a/sound/soc/codecs/rt5575-spi.c b/sound/soc/codecs/rt5575-spi.c
new file mode 100644
index 000000000000..c8eadb2f59a6
--- /dev/null
+++ b/sound/soc/codecs/rt5575-spi.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * rt5575-spi.c  --  ALC5575 SPI driver
+ *
+ * Copyright(c) 2025 Realtek Semiconductor Corp.
+ *
+ */
+
+#include <linux/firmware.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+#include "rt5575-spi.h"
+
+#define RT5575_SPI_CMD_BURST_WRITE	5
+#define RT5575_SPI_BUF_LEN		240
+
+struct rt5575_spi_burst_write {
+	u8 cmd;
+	u32 addr;
+	u8 data[RT5575_SPI_BUF_LEN];
+	u8 dummy;
+} __packed;
+
+struct spi_device *rt5575_spi_get_device(struct device *dev)
+{
+	struct device_node *spi_np;
+	struct spi_controller *ctlr;
+	struct spi_device *spi;
+	u32 cs;
+
+	spi_np = of_parse_phandle(dev->of_node, "spi-parent", 0);
+	if (!spi_np) {
+		dev_err(dev, "Failed to get spi-parent phandle\n");
+		return NULL;
+	}
+
+	if (of_property_read_u32_index(dev->of_node, "spi-parent", 1, &cs))
+		cs = 0;
+
+	if (cs >= ctlr->num_chipselect) {
+		dev_err(dev, "Chip select has wrong number %d\n", cs);
+		of_node_put(spi_np);
+		return NULL;
+	}
+
+	ctlr = of_find_spi_controller_by_node(spi_np);
+	of_node_put(spi_np);
+	if (!ctlr)
+		return NULL;
+
+	spi = spi_new_device(ctlr, &(struct spi_board_info){
+		.modalias = "rt5575",
+		.chip_select = cs,
+		.max_speed_hz = 10000000,
+	});
+
+	spi_controller_put(ctlr);
+	return spi;
+}
+
+/**
+ * rt5575_spi_burst_write - Write data to SPI by rt5575 address.
+ * @spi: SPI device.
+ * @addr: Start address.
+ * @txbuf: Data buffer for writing.
+ * @len: Data length.
+ *
+ */
+static int rt5575_spi_burst_write(struct spi_device *spi, u32 addr, const u8 *txbuf,
+						size_t len)
+{
+	struct rt5575_spi_burst_write buf = {
+		.cmd = RT5575_SPI_CMD_BURST_WRITE
+	};
+	unsigned int end, offset = 0;
+
+	while (offset < len) {
+		if (offset + RT5575_SPI_BUF_LEN <= len)
+			end = RT5575_SPI_BUF_LEN;
+		else
+			end = len % RT5575_SPI_BUF_LEN;
+
+		buf.addr = cpu_to_le32(addr + offset);
+		memcpy(&buf.data, &txbuf[offset], end);
+		spi_write(spi, &buf, sizeof(buf));
+
+		offset += RT5575_SPI_BUF_LEN;
+	}
+
+	return 0;
+}
+
+int rt5575_spi_fw_load(struct spi_device *spi)
+{
+	const struct firmware *firmware;
+	struct device *dev = &spi->dev;
+	static const char * const fw_path[] = {
+		"realtek/rt5575/rt5575_fw1.bin",
+		"realtek/rt5575/rt5575_fw2.bin",
+		"realtek/rt5575/rt5575_fw3.bin",
+		"realtek/rt5575/rt5575_fw4.bin"
+	};
+	static const u32 fw_addr[] = { 0x5f400000, 0x5f600000, 0x5f7fe000, 0x5f7ff000 };
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(fw_addr); i++) {
+		ret = request_firmware(&firmware, fw_path[i], dev);
+		if (!ret) {
+			rt5575_spi_burst_write(spi, fw_addr[i], firmware->data, firmware->size);
+			release_firmware(firmware);
+		} else {
+			dev_err(dev, "Request firmware failure: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
diff --git a/sound/soc/codecs/rt5575-spi.h b/sound/soc/codecs/rt5575-spi.h
new file mode 100644
index 000000000000..3b296bcac9a6
--- /dev/null
+++ b/sound/soc/codecs/rt5575-spi.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * rt5575-spi.h  --  ALC5575 SPI driver
+ *
+ * Copyright(c) 2025 Realtek Semiconductor Corp.
+ *
+ */
+
+#ifndef __RT5575_SPI_H__
+#define __RT5575_SPI_H__
+
+#if IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI)
+struct spi_device *rt5575_spi_get_device(struct device *dev);
+int rt5575_spi_fw_load(struct spi_device *spi);
+#else
+static inline struct spi_device *rt5575_spi_get_device(struct device *dev)
+{
+	return NULL;
+}
+static inline int rt5575_spi_fw_load(struct spi_device *spi)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif /* __RT5575_SPI_H__ */
diff --git a/sound/soc/codecs/rt5575.c b/sound/soc/codecs/rt5575.c
new file mode 100644
index 000000000000..c3a9ba22a90d
--- /dev/null
+++ b/sound/soc/codecs/rt5575.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * rt5575.c  --  ALC5575 ALSA SoC audio component driver
+ *
+ * Copyright(c) 2025 Realtek Semiconductor Corp.
+ *
+ */
+
+#include <linux/i2c.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include "rt5575.h"
+#include "rt5575-spi.h"
+
+static bool rt5575_readable_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case RT5575_ID:
+	case RT5575_ID_1:
+	case RT5575_MIXL_VOL:
+	case RT5575_MIXR_VOL:
+	case RT5575_PROMPT_VOL:
+	case RT5575_SPK01_VOL:
+	case RT5575_SPK23_VOL:
+	case RT5575_MIC1_VOL:
+	case RT5575_MIC2_VOL:
+	case RT5575_WNC_CTRL:
+	case RT5575_MODE_CTRL:
+	case RT5575_I2S_RATE_CTRL:
+	case RT5575_SLEEP_CTRL:
+	case RT5575_ALG_BYPASS_CTRL:
+	case RT5575_PINMUX_CTRL_2:
+	case RT5575_GPIO_CTRL_1:
+	case RT5575_DSP_BUS_CTRL:
+	case RT5575_SW_INT:
+	case RT5575_DSP_BOOT_ERR:
+	case RT5575_DSP_READY:
+	case RT5575_DSP_CMD_ADDR:
+	case RT5575_EFUSE_DATA_2:
+	case RT5575_EFUSE_DATA_3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const DECLARE_TLV_DB_SCALE(ob_tlv, -9525, 75, 0);
+
+static const struct snd_kcontrol_new rt5575_snd_controls[] = {
+	SOC_DOUBLE("Speaker CH-01 Playback Switch", RT5575_SPK01_VOL, 31, 15, 1, 1),
+	SOC_DOUBLE_TLV("Speaker CH-01 Playback Volume", RT5575_SPK01_VOL, 17, 1, 167, 0, ob_tlv),
+	SOC_DOUBLE("Speaker CH-23 Playback Switch", RT5575_SPK23_VOL, 31, 15, 1, 1),
+	SOC_DOUBLE_TLV("Speaker CH-23 Playback Volume", RT5575_SPK23_VOL, 17, 1, 167, 0, ob_tlv),
+	SOC_DOUBLE("Mic1 Capture Switch", RT5575_MIC1_VOL, 31, 15, 1, 1),
+	SOC_DOUBLE_TLV("Mic1 Capture Volume", RT5575_MIC1_VOL, 17, 1, 167, 0, ob_tlv),
+	SOC_DOUBLE("Mic2 Capture Switch", RT5575_MIC2_VOL, 31, 15, 1, 1),
+	SOC_DOUBLE_TLV("Mic2 Capture Volume", RT5575_MIC2_VOL, 17, 1, 167, 0, ob_tlv),
+	SOC_DOUBLE_R("Mix Playback Switch", RT5575_MIXL_VOL, RT5575_MIXR_VOL, 31, 1, 1),
+	SOC_DOUBLE_R_TLV("Mix Playback Volume", RT5575_MIXL_VOL, RT5575_MIXR_VOL, 1, 127, 0,
+		ob_tlv),
+	SOC_DOUBLE("Prompt Playback Switch", RT5575_PROMPT_VOL, 31, 15, 1, 1),
+	SOC_DOUBLE_TLV("Prompt Playback Volume", RT5575_PROMPT_VOL, 17, 1, 167, 0, ob_tlv),
+};
+
+static const struct snd_soc_dapm_widget rt5575_dapm_widgets[] = {
+	SND_SOC_DAPM_AIF_IN("AIF1RX", "AIF1 Playback", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("AIF1TX", "AIF1 Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("AIF2RX", "AIF2 Playback", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("AIF2TX", "AIF2 Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("AIF3RX", "AIF3 Playback", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("AIF3TX", "AIF3 Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("AIF4RX", "AIF4 Playback", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("AIF4TX", "AIF4 Capture", 0, SND_SOC_NOPM, 0, 0),
+
+	SND_SOC_DAPM_INPUT("INPUT"),
+	SND_SOC_DAPM_OUTPUT("OUTPUT"),
+};
+
+static const struct snd_soc_dapm_route rt5575_dapm_routes[] = {
+	{ "AIF1TX", NULL, "INPUT" },
+	{ "AIF2TX", NULL, "INPUT" },
+	{ "AIF3TX", NULL, "INPUT" },
+	{ "AIF4TX", NULL, "INPUT" },
+	{ "OUTPUT", NULL, "AIF1RX" },
+	{ "OUTPUT", NULL, "AIF2RX" },
+	{ "OUTPUT", NULL, "AIF3RX" },
+	{ "OUTPUT", NULL, "AIF4RX" },
+};
+
+static long long rt5575_get_priv_id(struct rt5575_priv *rt5575)
+{
+	int priv_id_low, priv_id_high;
+
+	regmap_write(rt5575->regmap, RT5575_EFUSE_PID, 0xa0000000);
+	regmap_read(rt5575->regmap, RT5575_EFUSE_DATA_2, &priv_id_low);
+	regmap_read(rt5575->regmap, RT5575_EFUSE_DATA_3, &priv_id_high);
+	regmap_write(rt5575->regmap, RT5575_EFUSE_PID, 0);
+
+	return ((long long)priv_id_high << 32) | (long long)priv_id_low;
+}
+
+static int rt5575_probe(struct snd_soc_component *component)
+{
+	struct rt5575_priv *rt5575 = snd_soc_component_get_drvdata(component);
+	struct device *dev = component->dev;
+
+	rt5575->component = component;
+
+	dev_info(dev, "Private ID: %llx\n", rt5575_get_priv_id(rt5575));
+
+	return 0;
+}
+
+#define RT5575_STEREO_RATES SNDRV_PCM_RATE_8000_192000
+#define RT5575_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S8 | \
+			SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_driver rt5575_dai[] = {
+	{
+		.name = "rt5575-aif1",
+		.id = RT5575_AIF1,
+		.playback = {
+			.stream_name = "AIF1 Playback",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+		.capture = {
+			.stream_name = "AIF1 Capture",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+	},
+	{
+		.name = "rt5575-aif2",
+		.id = RT5575_AIF2,
+		.playback = {
+			.stream_name = "AIF2 Playback",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+		.capture = {
+			.stream_name = "AIF2 Capture",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+	},
+	{
+		.name = "rt5575-aif3",
+		.id = RT5575_AIF3,
+		.playback = {
+			.stream_name = "AIF3 Playback",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+		.capture = {
+			.stream_name = "AIF3 Capture",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+	},
+	{
+		.name = "rt5575-aif4",
+		.id = RT5575_AIF4,
+		.playback = {
+			.stream_name = "AIF4 Playback",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+		.capture = {
+			.stream_name = "AIF4 Capture",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = RT5575_STEREO_RATES,
+			.formats = RT5575_FORMATS,
+		},
+	},
+};
+
+static const struct snd_soc_component_driver rt5575_soc_component_dev = {
+	.probe = rt5575_probe,
+	.controls = rt5575_snd_controls,
+	.num_controls = ARRAY_SIZE(rt5575_snd_controls),
+	.dapm_widgets = rt5575_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(rt5575_dapm_widgets),
+	.dapm_routes = rt5575_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(rt5575_dapm_routes),
+	.use_pmdown_time = 1,
+	.endianness = 1,
+};
+
+static const struct regmap_config rt5575_dsp_regmap = {
+	.name = "dsp",
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 2,
+};
+
+static int rt5575_i2c_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct i2c_client *client = context;
+	struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
+
+	regmap_read(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING, val);
+
+	return 0;
+}
+
+static int rt5575_i2c_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct i2c_client *client = context;
+	struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
+
+	regmap_write(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING, val);
+
+	return 0;
+}
+
+static const struct regmap_config rt5575_regmap = {
+	.reg_bits = 16,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0xfffc,
+	.readable_reg = rt5575_readable_register,
+	.reg_read = rt5575_i2c_read,
+	.reg_write = rt5575_i2c_write,
+	.use_single_read = true,
+	.use_single_write = true,
+};
+
+static int rt5575_fw_load_by_spi(struct rt5575_priv *rt5575)
+{
+	struct i2c_client *i2c = rt5575->i2c;
+	struct spi_device *spi;
+	struct device *dev = &i2c->dev;
+	int ret;
+
+	spi = rt5575_spi_get_device(dev);
+	if (!spi) {
+		dev_warn(dev, "The spi-parent not described in the DTS\n"
+			      "The hardware configuration should be with built-in flash\n");
+
+		if (!IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI))
+			dev_warn(dev, "If the spi-parent is set in the DTS and it is without built-in flash\n"
+				      "Please enable CONFIG_SND_SOC_RT5575_SPI\n");
+
+		return -ENXIO;
+	}
+
+	regmap_write(rt5575->dsp_regmap, 0xfafafafa, 0x00000004);
+	regmap_write(rt5575->dsp_regmap, 0x18008064, 0x00000000);
+	regmap_write(rt5575->dsp_regmap, 0x18008068, 0x0002ffff);
+
+	ret = rt5575_spi_fw_load(spi);
+	if (ret) {
+		dev_err(dev, "Load firmware failure: %d\n", ret);
+		return -ENODEV;
+	}
+
+	regmap_write(rt5575->dsp_regmap, 0x18000000, 0x00000000);
+	regmap_update_bits(rt5575->regmap, RT5575_SW_INT, 1, 1);
+
+	regmap_read_poll_timeout(rt5575->regmap, RT5575_SW_INT, ret, !ret, 100000, 10000000);
+	if (ret) {
+		dev_err(dev, "Run firmware failure: %d\n", ret);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int rt5575_i2c_probe(struct i2c_client *i2c)
+{
+	struct rt5575_priv *rt5575;
+	struct device *dev = &i2c->dev;
+	int ret, val;
+
+	rt5575 = devm_kzalloc(dev, sizeof(struct rt5575_priv), GFP_KERNEL);
+	if (!rt5575)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, rt5575);
+
+	rt5575->i2c = i2c;
+
+	rt5575->dsp_regmap = devm_regmap_init_i2c(i2c, &rt5575_dsp_regmap);
+	if (IS_ERR(rt5575->dsp_regmap)) {
+		ret = PTR_ERR(rt5575->dsp_regmap);
+		dev_err(dev, "Failed to allocate DSP register map: %d\n", ret);
+		return ret;
+	}
+
+	rt5575->regmap = devm_regmap_init(dev, NULL, i2c, &rt5575_regmap);
+	if (IS_ERR(rt5575->regmap)) {
+		ret = PTR_ERR(rt5575->regmap);
+		dev_err(dev, "Failed to allocate register map: %d\n", ret);
+		return ret;
+	}
+
+	regmap_read(rt5575->regmap, RT5575_ID, &val);
+	if (val != RT5575_DEVICE_ID) {
+		dev_err(dev, "Device with ID register %08x is not rt5575\n", val);
+		return -ENODEV;
+	}
+
+	regmap_read(rt5575->regmap, RT5575_ID_1, &val);
+	if (!val) {
+		dev_err(dev, "This is not formal version\n");
+		return -ENODEV;
+	}
+
+	if (rt5575_fw_load_by_spi(rt5575) == -ENODEV)
+		return -ENODEV;
+
+	return devm_snd_soc_register_component(dev, &rt5575_soc_component_dev, rt5575_dai,
+						ARRAY_SIZE(rt5575_dai));
+}
+
+static const struct i2c_device_id rt5575_i2c_id[] = {
+	{ "rt5575" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, rt5575_i2c_id);
+
+static const struct of_device_id rt5575_of_match[] = {
+	{ .compatible = "realtek,rt5575" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rt5575_of_match);
+
+static struct i2c_driver rt5575_i2c_driver = {
+	.driver = {
+		.name = "rt5575",
+		.owner = THIS_MODULE,
+		.of_match_table = rt5575_of_match,
+	},
+	.probe = rt5575_i2c_probe,
+	.id_table = rt5575_i2c_id,
+};
+module_i2c_driver(rt5575_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC ALC5575 driver");
+MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/rt5575.h b/sound/soc/codecs/rt5575.h
new file mode 100644
index 000000000000..11149612274a
--- /dev/null
+++ b/sound/soc/codecs/rt5575.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * rt5575.h  --  ALC5575 ALSA SoC audio driver
+ *
+ * Copyright(c) 2025 Realtek Semiconductor Corp.
+ *
+ */
+
+#ifndef __RT5575_H__
+#define __RT5575_H__
+
+#define RT5575_DEVICE_ID	0x10ec5575
+#define RT5575_DSP_MAPPING	0x18000000
+
+#define RT5575_ID		0x8008
+#define RT5575_ID_1		0x800c
+#define RT5575_MIXL_VOL		0x8a14
+#define RT5575_MIXR_VOL		0x8a18
+#define RT5575_PROMPT_VOL	0x8a84
+#define RT5575_SPK01_VOL	0x8a88
+#define RT5575_SPK23_VOL	0x8a8c
+#define RT5575_MIC1_VOL		0x8a98
+#define RT5575_MIC2_VOL		0x8a9c
+#define RT5575_WNC_CTRL		0x80ec
+#define RT5575_MODE_CTRL	0x80f0
+#define RT5575_I2S_RATE_CTRL	0x80f4
+#define RT5575_SLEEP_CTRL	0x80f8
+#define RT5575_ALG_BYPASS_CTRL	0x80fc
+#define RT5575_PINMUX_CTRL_2	0x81a4
+#define RT5575_GPIO_CTRL_1	0x8208
+#define RT5575_DSP_BUS_CTRL	0x880c
+#define RT5575_SW_INT		0x0018
+#define RT5575_DSP_BOOT_ERR	0x8e14
+#define RT5575_DSP_READY	0x8e24
+#define RT5575_DSP_CMD_ADDR	0x8e28
+#define RT5575_EFUSE_DATA_2	0xc638
+#define RT5575_EFUSE_DATA_3	0xc63c
+#define RT5575_EFUSE_PID	0xc660
+
+enum {
+	RT5575_AIF1,
+	RT5575_AIF2,
+	RT5575_AIF3,
+	RT5575_AIF4,
+	RT5575_AIFS,
+};
+
+struct rt5575_priv {
+	struct i2c_client *i2c;
+	struct snd_soc_component *component;
+	struct regmap *dsp_regmap, *regmap;
+};
+
+#endif /* __RT5575_H__ */
-- 
2.52.0

Re: [PATCH v10 3/3] ASoC: rt5575: Add the codec driver for the ALC5575

[Cezary Rojewski]

On 2025-12-16 8:18 AM, Oder Chiou wrote:
> The ALC5575 integrates an audio DSP that typically loads its firmware
> from an external flash via its own SPI host interface. In certain
> hardware configurations, the firmware can alternatively be loaded
> through the SPI client interface. The driver provides basic mute and
> volume control functions. When the SPI client interface is enabled,
> firmware loading is handled by the SPI driver.
> 
> Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
> ---
>   sound/soc/codecs/Kconfig      |  10 +
>   sound/soc/codecs/Makefile     |   3 +
>   sound/soc/codecs/rt5575-spi.c | 119 +++++++++++
>   sound/soc/codecs/rt5575-spi.h |  26 +++
>   sound/soc/codecs/rt5575.c     | 359 ++++++++++++++++++++++++++++++++++
>   sound/soc/codecs/rt5575.h     |  54 +++++
>   6 files changed, 571 insertions(+)
>   create mode 100644 sound/soc/codecs/rt5575-spi.c
>   create mode 100644 sound/soc/codecs/rt5575-spi.h
>   create mode 100644 sound/soc/codecs/rt5575.c
>   create mode 100644 sound/soc/codecs/rt5575.h
> 
> diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> index 061791e61907..14f3d09e7117 100644
> --- a/sound/soc/codecs/Kconfig
> +++ b/sound/soc/codecs/Kconfig
> @@ -212,6 +212,7 @@ config SND_SOC_ALL_CODECS
>   	imply SND_SOC_RT1305
>   	imply SND_SOC_RT1308
>   	imply SND_SOC_RT5514
> +	imply SND_SOC_RT5575
>   	imply SND_SOC_RT5616
>   	imply SND_SOC_RT5631
>   	imply SND_SOC_RT5640
> @@ -1783,6 +1784,15 @@ config SND_SOC_RT5514_SPI_BUILTIN
>   	bool # force RT5514_SPI to be built-in to avoid link errors
>   	default SND_SOC_RT5514=y && SND_SOC_RT5514_SPI=m
>   
> +config SND_SOC_RT5575
> +	tristate "Realtek ALC5575 Codec - I2C"
> +	depends on I2C
> +
> +config SND_SOC_RT5575_SPI
> +	tristate "Realtek ALC5575 Codec - SPI"
> +	depends on SPI_MASTER && I2C
> +	depends on SND_SOC_RT5575
> +
>   config SND_SOC_RT5616
>   	tristate "Realtek RT5616 CODEC"
>   	depends on I2C
> diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
> index d687d4f74363..a6406bc907a9 100644
> --- a/sound/soc/codecs/Makefile
> +++ b/sound/soc/codecs/Makefile
> @@ -253,6 +253,8 @@ snd-soc-rt286-y := rt286.o
>   snd-soc-rt298-y := rt298.o
>   snd-soc-rt5514-y := rt5514.o
>   snd-soc-rt5514-spi-y := rt5514-spi.o
> +snd-soc-rt5575-y := rt5575.o
> +snd-soc-rt5575-$(CONFIG_SND_SOC_RT5575_SPI) += rt5575-spi.o
>   snd-soc-rt5616-y := rt5616.o
>   snd-soc-rt5631-y := rt5631.o
>   snd-soc-rt5640-y := rt5640.o
> @@ -686,6 +688,7 @@ obj-$(CONFIG_SND_SOC_RT298)	+= snd-soc-rt298.o
>   obj-$(CONFIG_SND_SOC_RT5514)	+= snd-soc-rt5514.o
>   obj-$(CONFIG_SND_SOC_RT5514_SPI)	+= snd-soc-rt5514-spi.o
>   obj-$(CONFIG_SND_SOC_RT5514_SPI_BUILTIN)	+= snd-soc-rt5514-spi.o
> +obj-$(CONFIG_SND_SOC_RT5575)	+= snd-soc-rt5575.o
>   obj-$(CONFIG_SND_SOC_RT5616)	+= snd-soc-rt5616.o
>   obj-$(CONFIG_SND_SOC_RT5631)	+= snd-soc-rt5631.o
>   obj-$(CONFIG_SND_SOC_RT5640)	+= snd-soc-rt5640.o
> diff --git a/sound/soc/codecs/rt5575-spi.c b/sound/soc/codecs/rt5575-spi.c
> new file mode 100644
> index 000000000000..c8eadb2f59a6
> --- /dev/null
> +++ b/sound/soc/codecs/rt5575-spi.c
> @@ -0,0 +1,119 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * rt5575-spi.c  --  ALC5575 SPI driver
> + *
> + * Copyright(c) 2025 Realtek Semiconductor Corp.
> + *
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/of.h>
> +#include <linux/spi/spi.h>
> +
> +#include "rt5575-spi.h"
> +
> +#define RT5575_SPI_CMD_BURST_WRITE	5
> +#define RT5575_SPI_BUF_LEN		240
> +
> +struct rt5575_spi_burst_write {
> +	u8 cmd;
> +	u32 addr;
> +	u8 data[RT5575_SPI_BUF_LEN];
> +	u8 dummy;
> +} __packed;
> +
> +struct spi_device *rt5575_spi_get_device(struct device *dev)
> +{
> +	struct device_node *spi_np;
> +	struct spi_controller *ctlr;

Reorder to achieve reverse-christmas-tree notation. Waterfall to a 
number of functions found in this patch.

> +	struct spi_device *spi;
> +	u32 cs;
> +
> +	spi_np = of_parse_phandle(dev->of_node, "spi-parent", 0);
> +	if (!spi_np) {
> +		dev_err(dev, "Failed to get spi-parent phandle\n");
> +		return NULL;
> +	}
> +
> +	if (of_property_read_u32_index(dev->of_node, "spi-parent", 1, &cs))
> +		cs = 0;
> +
> +	if (cs >= ctlr->num_chipselect) {
> +		dev_err(dev, "Chip select has wrong number %d\n", cs);
> +		of_node_put(spi_np);
> +		return NULL;
> +	}
> +
> +	ctlr = of_find_spi_controller_by_node(spi_np);
> +	of_node_put(spi_np);
> +	if (!ctlr)
> +		return NULL;
> +
> +	spi = spi_new_device(ctlr, &(struct spi_board_info){
> +		.modalias = "rt5575",
> +		.chip_select = cs,
> +		.max_speed_hz = 10000000,
> +	});
> +
> +	spi_controller_put(ctlr);
> +	return spi;
> +}
> +
> +/**
> + * rt5575_spi_burst_write - Write data to SPI by rt5575 address.
> + * @spi: SPI device.
> + * @addr: Start address.
> + * @txbuf: Data buffer for writing.
> + * @len: Data length.
> + *
> + */
> +static int rt5575_spi_burst_write(struct spi_device *spi, u32 addr, const u8 *txbuf,
> +						size_t len)

Alignment or, just make it one-liner. It fits the limit.

> +{
> +	struct rt5575_spi_burst_write buf = {
> +		.cmd = RT5575_SPI_CMD_BURST_WRITE

Missing comma at the end.

> +	};
> +	unsigned int end, offset = 0;
> +
> +	while (offset < len) {
> +		if (offset + RT5575_SPI_BUF_LEN <= len)
> +			end = RT5575_SPI_BUF_LEN;
> +		else
> +			end = len % RT5575_SPI_BUF_LEN;
> +
> +		buf.addr = cpu_to_le32(addr + offset);
> +		memcpy(&buf.data, &txbuf[offset], end);
> +		spi_write(spi, &buf, sizeof(buf));
> +
> +		offset += RT5575_SPI_BUF_LEN;
> +	}
> +
> +	return 0;

If you intend on ignoring result of spi_write()s, then I see no reason 
why rt5575_spi_burst_write() shouldn't be a void function.

> +}
> +
> +int rt5575_spi_fw_load(struct spi_device *spi)
> +{
> +	const struct firmware *firmware;
> +	struct device *dev = &spi->dev;
> +	static const char * const fw_path[] = {
> +		"realtek/rt5575/rt5575_fw1.bin",
> +		"realtek/rt5575/rt5575_fw2.bin",
> +		"realtek/rt5575/rt5575_fw3.bin",
> +		"realtek/rt5575/rt5575_fw4.bin"
> +	};
> +	static const u32 fw_addr[] = { 0x5f400000, 0x5f600000, 0x5f7fe000, 0x5f7ff000 };
> +	int i, ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(fw_addr); i++) {
> +		ret = request_firmware(&firmware, fw_path[i], dev);

So, in v8 or earlier the ordering of operations was different:

	request_firmware(fw1);

	regmap_write();
	regmap_write();
	regmap_write();

	rt5575_spi_burst_write();
	release_firmware(fw1);

	/* Proceed with loop for the remaining fw2, fw3, fw4. */

What changed that suddenly the ordering could be simplified?

> +		if (!ret) {
> +			rt5575_spi_burst_write(spi, fw_addr[i], firmware->data, firmware->size);
> +			release_firmware(firmware);
> +		} else {
> +			dev_err(dev, "Request firmware failure: %d\n", ret);
> +			return ret;
> +		}

Please refactor this construct. When facing else-return, favour 
returning early to reduce indentation and make it easier to read the code.

	if (ret) {
		dev_err();
		return ret;
	}

	rt5575_spi_burst_write();
	release_firmware();

Much better, isn't it?

> +	}
> +
> +	return 0;
> +}
> diff --git a/sound/soc/codecs/rt5575-spi.h b/sound/soc/codecs/rt5575-spi.h
> new file mode 100644
> index 000000000000..3b296bcac9a6
> --- /dev/null
> +++ b/sound/soc/codecs/rt5575-spi.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * rt5575-spi.h  --  ALC5575 SPI driver
> + *
> + * Copyright(c) 2025 Realtek Semiconductor Corp.
> + *
> + */
> +
> +#ifndef __RT5575_SPI_H__
> +#define __RT5575_SPI_H__
> +
> +#if IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI)
> +struct spi_device *rt5575_spi_get_device(struct device *dev);
> +int rt5575_spi_fw_load(struct spi_device *spi);
> +#else
> +static inline struct spi_device *rt5575_spi_get_device(struct device *dev)
> +{
> +	return NULL;
> +}

Missing newline.

> +static inline int rt5575_spi_fw_load(struct spi_device *spi)
> +{
> +	return -EINVAL;
> +}
> +#endif
> +
> +#endif /* __RT5575_SPI_H__ */
> diff --git a/sound/soc/codecs/rt5575.c b/sound/soc/codecs/rt5575.c
> new file mode 100644
> index 000000000000..c3a9ba22a90d
> --- /dev/null
> +++ b/sound/soc/codecs/rt5575.c
> @@ -0,0 +1,359 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * rt5575.c  --  ALC5575 ALSA SoC audio component driver
> + *
> + * Copyright(c) 2025 Realtek Semiconductor Corp.
> + *
> + */
> +
> +#include <linux/i2c.h>
> +#include <sound/soc.h>
> +#include <sound/tlv.h>
> +
> +#include "rt5575.h"
> +#include "rt5575-spi.h"

(...)

> +static int rt5575_i2c_read(void *context, unsigned int reg, unsigned int *val)
> +{
> +	struct i2c_client *client = context;
> +	struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
> +
> +	regmap_read(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING, val);
> +
> +	return 0;
> +}
> +
> +static int rt5575_i2c_write(void *context, unsigned int reg, unsigned int val)
> +{
> +	struct i2c_client *client = context;
> +	struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
> +
> +	regmap_write(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING, val);
> +
> +	return 0;

Not an expect in regmap, but I'd leave decision to the caller whether to 
squelch an error or not.

For both, rt5575_i2c_read()/write() I'd just return the corresponding 
regmap_xxx() operation rather then '0'.

> +}
> +
> +static const struct regmap_config rt5575_regmap = {
> +	.reg_bits = 16,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = 0xfffc,
> +	.readable_reg = rt5575_readable_register,
> +	.reg_read = rt5575_i2c_read,
> +	.reg_write = rt5575_i2c_write,
> +	.use_single_read = true,
> +	.use_single_write = true,
> +};
> +
> +static int rt5575_fw_load_by_spi(struct rt5575_priv *rt5575)
> +{
> +	struct i2c_client *i2c = rt5575->i2c;
> +	struct spi_device *spi;
> +	struct device *dev = &i2c->dev;
> +	int ret;
> +
> +	spi = rt5575_spi_get_device(dev);
> +	if (!spi) {
> +		dev_warn(dev, "The spi-parent not described in the DTS\n"
> +			      "The hardware configuration should be with built-in flash\n");
> +
> +		if (!IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI))
> +			dev_warn(dev, "If the spi-parent is set in the DTS and it is without built-in flash\n"
> +				      "Please enable CONFIG_SND_SOC_RT5575_SPI\n");

Does this mean we always get a warning, even in case when we're dealing 
with non-SPI variant?

> +
> +		return -ENXIO;
> +	}
> +
> +	regmap_write(rt5575->dsp_regmap, 0xfafafafa, 0x00000004);
> +	regmap_write(rt5575->dsp_regmap, 0x18008064, 0x00000000);
> +	regmap_write(rt5575->dsp_regmap, 0x18008068, 0x0002ffff);
> +
> +	ret = rt5575_spi_fw_load(spi);
> +	if (ret) {
> +		dev_err(dev, "Load firmware failure: %d\n", ret);
> +		return -ENODEV;
> +	}
> +
> +	regmap_write(rt5575->dsp_regmap, 0x18000000, 0x00000000);
> +	regmap_update_bits(rt5575->regmap, RT5575_SW_INT, 1, 1);
> +
> +	regmap_read_poll_timeout(rt5575->regmap, RT5575_SW_INT, ret, !ret, 100000, 10000000);
> +	if (ret) {
> +		dev_err(dev, "Run firmware failure: %d\n", ret);
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rt5575_i2c_probe(struct i2c_client *i2c)
> +{
> +	struct rt5575_priv *rt5575;
> +	struct device *dev = &i2c->dev;
> +	int ret, val;
> +
> +	rt5575 = devm_kzalloc(dev, sizeof(struct rt5575_priv), GFP_KERNEL);
> +	if (!rt5575)
> +		return -ENOMEM;
> +
> +	i2c_set_clientdata(i2c, rt5575);
> +
> +	rt5575->i2c = i2c;
> +
> +	rt5575->dsp_regmap = devm_regmap_init_i2c(i2c, &rt5575_dsp_regmap);
> +	if (IS_ERR(rt5575->dsp_regmap)) {
> +		ret = PTR_ERR(rt5575->dsp_regmap);
> +		dev_err(dev, "Failed to allocate DSP register map: %d\n", ret);
> +		return ret;
> +	}
> +
> +	rt5575->regmap = devm_regmap_init(dev, NULL, i2c, &rt5575_regmap);
> +	if (IS_ERR(rt5575->regmap)) {
> +		ret = PTR_ERR(rt5575->regmap);
> +		dev_err(dev, "Failed to allocate register map: %d\n", ret);
> +		return ret;
> +	}
> +
> +	regmap_read(rt5575->regmap, RT5575_ID, &val);
> +	if (val != RT5575_DEVICE_ID) {
> +		dev_err(dev, "Device with ID register %08x is not rt5575\n", val);
> +		return -ENODEV;
> +	}
> +
> +	regmap_read(rt5575->regmap, RT5575_ID_1, &val);
> +	if (!val) {

1. The 'RT5575_DEVICE_ID' check above fails, 'val' equals 
RT5575_DEVICE_ID, non-zero.
2. regmap_read(RT5575_ID_1) fails, let's skip the reasoning for now. 
'val' remains unchanged.
3. The '!val' check fails though nothing has been actually read, 'val' 
could be simply invalid.

What's the goal of this check? Shouldn't we be more precise when 
checking the 'formal version'?

> +		dev_err(dev, "This is not formal version\n");
> +		return -ENODEV;
> +	}
> +
> +	if (rt5575_fw_load_by_spi(rt5575) == -ENODEV)
> +		return -ENODEV;

Looks like a hack, not a real solution. Also, I'm surprised it's called 
unconditionally - even when dealing with device with no SPI component.

> +
> +	return devm_snd_soc_register_component(dev, &rt5575_soc_component_dev, rt5575_dai,
> +						ARRAY_SIZE(rt5575_dai));

Alignment.

> +}
> +
> +static const struct i2c_device_id rt5575_i2c_id[] = {
> +	{ "rt5575" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, rt5575_i2c_id);
> +
> +static const struct of_device_id rt5575_of_match[] = {
> +	{ .compatible = "realtek,rt5575" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rt5575_of_match);
> +
> +static struct i2c_driver rt5575_i2c_driver = {
> +	.driver = {
> +		.name = "rt5575",
> +		.owner = THIS_MODULE,
> +		.of_match_table = rt5575_of_match,
> +	},
> +	.probe = rt5575_i2c_probe,
> +	.id_table = rt5575_i2c_id,
> +};
> +module_i2c_driver(rt5575_i2c_driver);
> +
> +MODULE_DESCRIPTION("ASoC ALC5575 driver");
> +MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
> +MODULE_LICENSE("GPL");

Re: [PATCH v10 3/3] ASoC: rt5575: Add the codec driver for the ALC5575

[Mark Brown]

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On Wed, Dec 17, 2025 at 11:45:54AM +0100, Cezary Rojewski wrote:
> On 2025-12-16 8:18 AM, Oder Chiou wrote:

> > The ALC5575 integrates an audio DSP that typically loads its firmware
> > from an external flash via its own SPI host interface. In certain
> > hardware configurations, the firmware can alternatively be loaded
> > through the SPI client interface. The driver provides basic mute and
> > volume control functions. When the SPI client interface is enabled,
> > firmware loading is handled by the SPI driver.

Please delete unneeded context from mails when replying.  Doing this
makes it much easier to find your reply in the message, helping ensure
it won't be missed by people scrolling through the irrelevant quoted
material.

> > +struct spi_device *rt5575_spi_get_device(struct device *dev)
> > +{
> > +	struct device_node *spi_np;
> > +	struct spi_controller *ctlr;

> Reorder to achieve reverse-christmas-tree notation. Waterfall to a number of
> functions found in this patch.

This is not a general requirement for ASoC, it's something specific to
the x86 and SOF stuff.

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RE: [PATCH v10 3/3] ASoC: rt5575: Add the codec driver for the ALC5575

[Oder Chiou]

> -----Original Message-----
> From: Cezary Rojewski <cezary.rojewski@intel.com>
> Sent: Wednesday, December 17, 2025 6:46 PM
> To: Oder Chiou <oder_chiou@realtek.com>
> Cc: linux-spi@vger.kernel.org; perex@perex.cz; linux-sound@vger.kernel.org;
> devicetree@vger.kernel.org; alsa-devel@alsa-project.org; Flove(HsinFu)
> <flove@realtek.com>; Shuming [范書銘] <shumingf@realtek.com>; Jack Yu
> <jack.yu@realtek.com>; Derek [方德義] <derek.fang@realtek.com>;
> broonie@kernel.org; lgirdwood@gmail.com; robh@kernel.org;
> krzk+dt@kernel.org; conor+dt@kernel.org
> Subject: Re: [PATCH v10 3/3] ASoC: rt5575: Add the codec driver for the
> ALC5575
> 
> 
> External mail : This email originated from outside the organization. Do not
> reply, click links, or open attachments unless you recognize the sender and
> know the content is safe.
> 
> 
> 
> On 2025-12-16 8:18 AM, Oder Chiou wrote:
> > The ALC5575 integrates an audio DSP that typically loads its firmware
> > from an external flash via its own SPI host interface. In certain
> > hardware configurations, the firmware can alternatively be loaded
> > through the SPI client interface. The driver provides basic mute and
> > volume control functions. When the SPI client interface is enabled,
> > firmware loading is handled by the SPI driver.
> >
> > Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
> > ---
> >   sound/soc/codecs/Kconfig      |  10 +
> >   sound/soc/codecs/Makefile     |   3 +
> >   sound/soc/codecs/rt5575-spi.c | 119 +++++++++++
> >   sound/soc/codecs/rt5575-spi.h |  26 +++
> >   sound/soc/codecs/rt5575.c     | 359
> ++++++++++++++++++++++++++++++++++
> >   sound/soc/codecs/rt5575.h     |  54 +++++
> >   6 files changed, 571 insertions(+)
> >   create mode 100644 sound/soc/codecs/rt5575-spi.c
> >   create mode 100644 sound/soc/codecs/rt5575-spi.h
> >   create mode 100644 sound/soc/codecs/rt5575.c
> >   create mode 100644 sound/soc/codecs/rt5575.h
> >
> > diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> > index 061791e61907..14f3d09e7117 100644
> > --- a/sound/soc/codecs/Kconfig
> > +++ b/sound/soc/codecs/Kconfig
> > @@ -212,6 +212,7 @@ config SND_SOC_ALL_CODECS
> >       imply SND_SOC_RT1305
> >       imply SND_SOC_RT1308
> >       imply SND_SOC_RT5514
> > +     imply SND_SOC_RT5575
> >       imply SND_SOC_RT5616
> >       imply SND_SOC_RT5631
> >       imply SND_SOC_RT5640
> > @@ -1783,6 +1784,15 @@ config SND_SOC_RT5514_SPI_BUILTIN
> >       bool # force RT5514_SPI to be built-in to avoid link errors
> >       default SND_SOC_RT5514=y && SND_SOC_RT5514_SPI=m
> >
> > +config SND_SOC_RT5575
> > +     tristate "Realtek ALC5575 Codec - I2C"
> > +     depends on I2C
> > +
> > +config SND_SOC_RT5575_SPI
> > +     tristate "Realtek ALC5575 Codec - SPI"
> > +     depends on SPI_MASTER && I2C
> > +     depends on SND_SOC_RT5575
> > +
> >   config SND_SOC_RT5616
> >       tristate "Realtek RT5616 CODEC"
> >       depends on I2C
> > diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
> > index d687d4f74363..a6406bc907a9 100644
> > --- a/sound/soc/codecs/Makefile
> > +++ b/sound/soc/codecs/Makefile
> > @@ -253,6 +253,8 @@ snd-soc-rt286-y := rt286.o
> >   snd-soc-rt298-y := rt298.o
> >   snd-soc-rt5514-y := rt5514.o
> >   snd-soc-rt5514-spi-y := rt5514-spi.o
> > +snd-soc-rt5575-y := rt5575.o
> > +snd-soc-rt5575-$(CONFIG_SND_SOC_RT5575_SPI) += rt5575-spi.o
> >   snd-soc-rt5616-y := rt5616.o
> >   snd-soc-rt5631-y := rt5631.o
> >   snd-soc-rt5640-y := rt5640.o
> > @@ -686,6 +688,7 @@ obj-$(CONFIG_SND_SOC_RT298)       +=
> snd-soc-rt298.o
> >   obj-$(CONFIG_SND_SOC_RT5514)        += snd-soc-rt5514.o
> >   obj-$(CONFIG_SND_SOC_RT5514_SPI)    += snd-soc-rt5514-spi.o
> >   obj-$(CONFIG_SND_SOC_RT5514_SPI_BUILTIN)    +=
> snd-soc-rt5514-spi.o
> > +obj-$(CONFIG_SND_SOC_RT5575) += snd-soc-rt5575.o
> >   obj-$(CONFIG_SND_SOC_RT5616)        += snd-soc-rt5616.o
> >   obj-$(CONFIG_SND_SOC_RT5631)        += snd-soc-rt5631.o
> >   obj-$(CONFIG_SND_SOC_RT5640)        += snd-soc-rt5640.o
> > diff --git a/sound/soc/codecs/rt5575-spi.c b/sound/soc/codecs/rt5575-spi.c
> > new file mode 100644
> > index 000000000000..c8eadb2f59a6
> > --- /dev/null
> > +++ b/sound/soc/codecs/rt5575-spi.c
> > @@ -0,0 +1,119 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * rt5575-spi.c  --  ALC5575 SPI driver
> > + *
> > + * Copyright(c) 2025 Realtek Semiconductor Corp.
> > + *
> > + */
> > +
> > +#include <linux/firmware.h>
> > +#include <linux/of.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include "rt5575-spi.h"
> > +
> > +#define RT5575_SPI_CMD_BURST_WRITE   5
> > +#define RT5575_SPI_BUF_LEN           240
> > +
> > +struct rt5575_spi_burst_write {
> > +     u8 cmd;
> > +     u32 addr;
> > +     u8 data[RT5575_SPI_BUF_LEN];
> > +     u8 dummy;
> > +} __packed;
> > +
> > +struct spi_device *rt5575_spi_get_device(struct device *dev)
> > +{
> > +     struct device_node *spi_np;
> > +     struct spi_controller *ctlr;
> 
> Reorder to achieve reverse-christmas-tree notation. Waterfall to a
> number of functions found in this patch.
> 
> > +     struct spi_device *spi;
> > +     u32 cs;
> > +
> > +     spi_np = of_parse_phandle(dev->of_node, "spi-parent", 0);
> > +     if (!spi_np) {
> > +             dev_err(dev, "Failed to get spi-parent phandle\n");
> > +             return NULL;
> > +     }
> > +
> > +     if (of_property_read_u32_index(dev->of_node, "spi-parent", 1, &cs))
> > +             cs = 0;
> > +
> > +     if (cs >= ctlr->num_chipselect) {
> > +             dev_err(dev, "Chip select has wrong number %d\n", cs);
> > +             of_node_put(spi_np);
> > +             return NULL;
> > +     }
> > +
> > +     ctlr = of_find_spi_controller_by_node(spi_np);
> > +     of_node_put(spi_np);
> > +     if (!ctlr)
> > +             return NULL;
> > +
> > +     spi = spi_new_device(ctlr, &(struct spi_board_info){
> > +             .modalias = "rt5575",
> > +             .chip_select = cs,
> > +             .max_speed_hz = 10000000,
> > +     });
> > +
> > +     spi_controller_put(ctlr);
> > +     return spi;
> > +}
> > +
> > +/**
> > + * rt5575_spi_burst_write - Write data to SPI by rt5575 address.
> > + * @spi: SPI device.
> > + * @addr: Start address.
> > + * @txbuf: Data buffer for writing.
> > + * @len: Data length.
> > + *
> > + */
> > +static int rt5575_spi_burst_write(struct spi_device *spi, u32 addr, const u8
> *txbuf,
> > +                                             size_t len)
> 
> Alignment or, just make it one-liner. It fits the limit.
> 
> > +{
> > +     struct rt5575_spi_burst_write buf = {
> > +             .cmd = RT5575_SPI_CMD_BURST_WRITE
> 
> Missing comma at the end.
> 
> > +     };
> > +     unsigned int end, offset = 0;
> > +
> > +     while (offset < len) {
> > +             if (offset + RT5575_SPI_BUF_LEN <= len)
> > +                     end = RT5575_SPI_BUF_LEN;
> > +             else
> > +                     end = len % RT5575_SPI_BUF_LEN;
> > +
> > +             buf.addr = cpu_to_le32(addr + offset);
> > +             memcpy(&buf.data, &txbuf[offset], end);
> > +             spi_write(spi, &buf, sizeof(buf));
> > +
> > +             offset += RT5575_SPI_BUF_LEN;
> > +     }
> > +
> > +     return 0;
> 
> If you intend on ignoring result of spi_write()s, then I see no reason
> why rt5575_spi_burst_write() shouldn't be a void function.
> 
> > +}
> > +
> > +int rt5575_spi_fw_load(struct spi_device *spi)
> > +{
> > +     const struct firmware *firmware;
> > +     struct device *dev = &spi->dev;
> > +     static const char * const fw_path[] = {
> > +             "realtek/rt5575/rt5575_fw1.bin",
> > +             "realtek/rt5575/rt5575_fw2.bin",
> > +             "realtek/rt5575/rt5575_fw3.bin",
> > +             "realtek/rt5575/rt5575_fw4.bin"
> > +     };
> > +     static const u32 fw_addr[] = { 0x5f400000, 0x5f600000, 0x5f7fe000,
> 0x5f7ff000 };
> > +     int i, ret;
> > +
> > +     for (i = 0; i < ARRAY_SIZE(fw_addr); i++) {
> > +             ret = request_firmware(&firmware, fw_path[i], dev);
> 
> So, in v8 or earlier the ordering of operations was different:
> 
>         request_firmware(fw1);
> 
>         regmap_write();
>         regmap_write();
>         regmap_write();
> 
>         rt5575_spi_burst_write();
>         release_firmware(fw1);
> 
>         /* Proceed with loop for the remaining fw2, fw3, fw4. */
> 
> What changed that suddenly the ordering could be simplified?

Originally, request_firmware_nowait was used when the driver built into the
kernel image and the firmwares was in filesystem. In order to match the
following flow, if the driver is built into the kernel image, the firmwares
should also be built into the kernel image.

1) boot I2C, init regmaps
2) boot SPI, load firmware
3) register ASoC component if 1) and 2) succeed

> > +             if (!ret) {
> > +                     rt5575_spi_burst_write(spi, fw_addr[i],
> firmware->data, firmware->size);
> > +                     release_firmware(firmware);
> > +             } else {
> > +                     dev_err(dev, "Request firmware failure: %d\n",
> ret);
> > +                     return ret;
> > +             }
> 
> Please refactor this construct. When facing else-return, favour
> returning early to reduce indentation and make it easier to read the code.
> 
>         if (ret) {
>                 dev_err();
>                 return ret;
>         }
> 
>         rt5575_spi_burst_write();
>         release_firmware();
> 
> Much better, isn't it?
> 
> > +     }
> > +
> > +     return 0;
> > +}
> > diff --git a/sound/soc/codecs/rt5575-spi.h b/sound/soc/codecs/rt5575-spi.h
> > new file mode 100644
> > index 000000000000..3b296bcac9a6
> > --- /dev/null
> > +++ b/sound/soc/codecs/rt5575-spi.h
> > @@ -0,0 +1,26 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * rt5575-spi.h  --  ALC5575 SPI driver
> > + *
> > + * Copyright(c) 2025 Realtek Semiconductor Corp.
> > + *
> > + */
> > +
> > +#ifndef __RT5575_SPI_H__
> > +#define __RT5575_SPI_H__
> > +
> > +#if IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI)
> > +struct spi_device *rt5575_spi_get_device(struct device *dev);
> > +int rt5575_spi_fw_load(struct spi_device *spi);
> > +#else
> > +static inline struct spi_device *rt5575_spi_get_device(struct device *dev)
> > +{
> > +     return NULL;
> > +}
> 
> Missing newline.
> 
> > +static inline int rt5575_spi_fw_load(struct spi_device *spi)
> > +{
> > +     return -EINVAL;
> > +}
> > +#endif
> > +
> > +#endif /* __RT5575_SPI_H__ */
> > diff --git a/sound/soc/codecs/rt5575.c b/sound/soc/codecs/rt5575.c
> > new file mode 100644
> > index 000000000000..c3a9ba22a90d
> > --- /dev/null
> > +++ b/sound/soc/codecs/rt5575.c
> > @@ -0,0 +1,359 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * rt5575.c  --  ALC5575 ALSA SoC audio component driver
> > + *
> > + * Copyright(c) 2025 Realtek Semiconductor Corp.
> > + *
> > + */
> > +
> > +#include <linux/i2c.h>
> > +#include <sound/soc.h>
> > +#include <sound/tlv.h>
> > +
> > +#include "rt5575.h"
> > +#include "rt5575-spi.h"
> 
> (...)
> 
> > +static int rt5575_i2c_read(void *context, unsigned int reg, unsigned int
> *val)
> > +{
> > +     struct i2c_client *client = context;
> > +     struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
> > +
> > +     regmap_read(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING,
> val);
> > +
> > +     return 0;
> > +}
> > +
> > +static int rt5575_i2c_write(void *context, unsigned int reg, unsigned int val)
> > +{
> > +     struct i2c_client *client = context;
> > +     struct rt5575_priv *rt5575 = i2c_get_clientdata(client);
> > +
> > +     regmap_write(rt5575->dsp_regmap, reg | RT5575_DSP_MAPPING,
> val);
> > +
> > +     return 0;
> 
> Not an expect in regmap, but I'd leave decision to the caller whether to
> squelch an error or not.
> 
> For both, rt5575_i2c_read()/write() I'd just return the corresponding
> regmap_xxx() operation rather then '0'.
> 
> > +}
> > +
> > +static const struct regmap_config rt5575_regmap = {
> > +     .reg_bits = 16,
> > +     .val_bits = 32,
> > +     .reg_stride = 4,
> > +     .max_register = 0xfffc,
> > +     .readable_reg = rt5575_readable_register,
> > +     .reg_read = rt5575_i2c_read,
> > +     .reg_write = rt5575_i2c_write,
> > +     .use_single_read = true,
> > +     .use_single_write = true,
> > +};
> > +
> > +static int rt5575_fw_load_by_spi(struct rt5575_priv *rt5575)
> > +{
> > +     struct i2c_client *i2c = rt5575->i2c;
> > +     struct spi_device *spi;
> > +     struct device *dev = &i2c->dev;
> > +     int ret;
> > +
> > +     spi = rt5575_spi_get_device(dev);
> > +     if (!spi) {
> > +             dev_warn(dev, "The spi-parent not described in the DTS\n"
> > +                           "The hardware configuration should be
> with built-in flash\n");
> > +
> > +             if (!IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI))
> > +                     dev_warn(dev, "If the spi-parent is set in the DTS
> and it is without built-in flash\n"
> > +                                   "Please enable
> CONFIG_SND_SOC_RT5575_SPI\n");
> 
> Does this mean we always get a warning, even in case when we're dealing
> with non-SPI variant?
> 
> > +
> > +             return -ENXIO;
> > +     }
> > +
> > +     regmap_write(rt5575->dsp_regmap, 0xfafafafa, 0x00000004);
> > +     regmap_write(rt5575->dsp_regmap, 0x18008064, 0x00000000);
> > +     regmap_write(rt5575->dsp_regmap, 0x18008068, 0x0002ffff);
> > +
> > +     ret = rt5575_spi_fw_load(spi);
> > +     if (ret) {
> > +             dev_err(dev, "Load firmware failure: %d\n", ret);
> > +             return -ENODEV;
> > +     }
> > +
> > +     regmap_write(rt5575->dsp_regmap, 0x18000000, 0x00000000);
> > +     regmap_update_bits(rt5575->regmap, RT5575_SW_INT, 1, 1);
> > +
> > +     regmap_read_poll_timeout(rt5575->regmap, RT5575_SW_INT,
> ret, !ret, 100000, 10000000);
> > +     if (ret) {
> > +             dev_err(dev, "Run firmware failure: %d\n", ret);
> > +             return -ENODEV;
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +static int rt5575_i2c_probe(struct i2c_client *i2c)
> > +{
> > +     struct rt5575_priv *rt5575;
> > +     struct device *dev = &i2c->dev;
> > +     int ret, val;
> > +
> > +     rt5575 = devm_kzalloc(dev, sizeof(struct rt5575_priv), GFP_KERNEL);
> > +     if (!rt5575)
> > +             return -ENOMEM;
> > +
> > +     i2c_set_clientdata(i2c, rt5575);
> > +
> > +     rt5575->i2c = i2c;
> > +
> > +     rt5575->dsp_regmap = devm_regmap_init_i2c(i2c,
> &rt5575_dsp_regmap);
> > +     if (IS_ERR(rt5575->dsp_regmap)) {
> > +             ret = PTR_ERR(rt5575->dsp_regmap);
> > +             dev_err(dev, "Failed to allocate DSP register map: %d\n",
> ret);
> > +             return ret;
> > +     }
> > +
> > +     rt5575->regmap = devm_regmap_init(dev, NULL, i2c,
> &rt5575_regmap);
> > +     if (IS_ERR(rt5575->regmap)) {
> > +             ret = PTR_ERR(rt5575->regmap);
> > +             dev_err(dev, "Failed to allocate register map: %d\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     regmap_read(rt5575->regmap, RT5575_ID, &val);
> > +     if (val != RT5575_DEVICE_ID) {
> > +             dev_err(dev, "Device with ID register %08x is not rt5575\n",
> val);
> > +             return -ENODEV;
> > +     }
> > +
> > +     regmap_read(rt5575->regmap, RT5575_ID_1, &val);
> > +     if (!val) {
> 
> 1. The 'RT5575_DEVICE_ID' check above fails, 'val' equals
> RT5575_DEVICE_ID, non-zero.
> 2. regmap_read(RT5575_ID_1) fails, let's skip the reasoning for now.
> 'val' remains unchanged.
> 3. The '!val' check fails though nothing has been actually read, 'val'
> could be simply invalid.
> 
> What's the goal of this check? Shouldn't we be more precise when
> checking the 'formal version'?

Since there is no in-formal version available, the formal version check
will be removed.