[PATCH v2 1/2] dt-bindings: sound: add Texas Instruments TAS2557

[Gianluca Boiano]

Document the TAS2557 mono Class-D smart amplifier with an integrated
DSP for speaker protection. The device is controlled over I2C and
receives audio over I2S/TDM (ASI). It can drive a single mono speaker
or, as two devices, a stereo pair; in that case the ti,channel
property selects the audio slot each device reproduces and the
per-device tuning it applies.

The on-chip DSP boots from a firmware image generated per speaker
design with the TI PurePath Console tuning tools; the optional
firmware-name property selects a board-specific image.

Signed-off-by: Gianluca Boiano <morf3089@xxxxxxxxx>
---
v2: add the four mandatory supplies to the "required" list (Wang Sen)

 .../devicetree/bindings/sound/ti,tas2557.yaml | 127 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 2 files changed, 128 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/ti,tas2557.yaml

diff --git a/Documentation/devicetree/bindings/sound/ti,tas2557.yaml b/Documentation/devicetree/bindings/sound/ti,tas2557.yaml
new file mode 100644
index 000000000000..862ea4036cb8
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ti,tas2557.yaml
@@ -0,0 +1,127 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2026 Gianluca Boiano <morf3089@xxxxxxxxx>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ti,tas2557.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments TAS2557 Mono Smart Amplifier
+
+maintainers:
+  - Gianluca Boiano <morf3089@xxxxxxxxx>
+
+description: |
+  The TAS2557 is a mono, digital-input Class-D amplifier with an
+  integrated DSP for speaker protection. Audio is carried over I2S/TDM
+  (ASI). The on-chip DSP boots from a firmware image that is generated
+  for a specific speaker design using the TI PurePath Console tuning
+  tools.
+
+  Stereo playback is built from two devices, each reproducing one audio
+  slot selected through the ti,channel property and applying the
+  matching per-device tuning contained in a stereo-tuned firmware
+  image.
+
+  Datasheet: https://www.ti.com/lit/gpn/tas2557
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: ti,tas2557
+
+  reg:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+  reset-gpios:
+    maxItems: 1
+    description: GPIO connected to the active-low RESET pin.
+
+  interrupts:
+    maxItems: 1
+    description: Fault interrupt output (INT).
+
+  vbat-supply:
+    description: Battery/boost input supply (VBAT), 2.9 V to 5.5 V.
+
+  iovdd-supply:
+    description: Digital I/O supply, 1.62 V to 3.6 V.
+
+  avdd-supply:
+    description: Analog supply, 1.65 V to 1.95 V.
+
+  dvdd-supply:
+    description: Digital core supply, 1.65 V to 1.95 V.
+
+  ti,imon-slot-no:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: TDM TX time slot for current-sense data.
+    default: 0
+    minimum: 0
+    maximum: 7
+
+  ti,vmon-slot-no:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: TDM TX time slot for voltage-sense data.
+    default: 2
+    minimum: 0
+    maximum: 7
+
+  ti,channel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Audio slot of the stereo stream reproduced by this device (0 =
+      left, 1 = right). With stereo firmware this also selects which
+      per-device tuning set is applied.
+    enum: [0, 1]
+    default: 0
+
+  firmware-name:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: |
+      Name of the DSP firmware image to load. Defaults to a name
+      derived from the silicon revision. Stereo systems typically use
+      a stereo-tuned image shared by both devices.
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+  - vbat-supply
+  - iovdd-supply
+  - avdd-supply
+  - dvdd-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        audio-codec@4c {
+            compatible = "ti,tas2557";
+            reg = <0x4c>;
+            #sound-dai-cells = <0>;
+            reset-gpios = <&tlmm 77 GPIO_ACTIVE_LOW>;
+            interrupt-parent = <&tlmm>;
+            interrupts = <73 IRQ_TYPE_LEVEL_HIGH>;
+
+            vbat-supply = <&vph_pwr>;
+            iovdd-supply = <&vreg_l6b_1p8>;
+            avdd-supply = <&vreg_l6b_1p8>;
+            dvdd-supply = <&vreg_l6b_1p8>;
+
+            ti,imon-slot-no = <0>;
+            ti,vmon-slot-no = <2>;
+            ti,channel = <0>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 15011f5752a9..8a824da3979e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26677,6 +26677,7 @@ M:	Sen Wang <sen@xxxxxx>
 L:	linux-sound@xxxxxxxxxxxxxxx
 S:	Maintained
 F:	Documentation/devicetree/bindings/sound/ti,tas2552.yaml
+F:	Documentation/devicetree/bindings/sound/ti,tas2557.yaml
 F:	Documentation/devicetree/bindings/sound/ti,tas2562.yaml
 F:	Documentation/devicetree/bindings/sound/ti,tas2770.yaml
 F:	Documentation/devicetree/bindings/sound/ti,tas27xx.yaml
-- 
2.55.0