ASoC: dt-bindings: Add Cirrus Logic CS48L32 audio DSP

The CS48L32 is an Audio DSP with microphone inputs and SPI
control interface. It has a programmable DSP and a variety of
power-efficient fixed-function audio processors, with configurable
digital mixing and routing.

Most properties are core properties: supply regulators, gpios, clocks,
interrupt parent and SPI interface. The custom properties define
the configuration of the microphone inputs to match what is physically
attached to them.

Signed-off-by: Richard Fitzgerald <[e-mail]>
Reviewed-by: "Rob Herring (Arm)" <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/cirrus,cs48l32.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cirrus,cs48l32.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic CS48L32 audio DSP.
+
+maintainers:
+  - [e-mail]
+
+description: |
+  The CS48L32 is a high-performance low-power audio DSP for smartphones and
+  other portable audio devices. The CS48L32 combines a programmable Halo Core
+  DSP with a variety of power-efficient fixed-function audio processors.
+
+  See also the binding headers:
+
+    include/dt-bindings/sound/cs48l32.yaml
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - cirrus,cs48l32
+
+  reg:
+    description: SPI chip-select number.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 25000000
+
+  vdd-a-supply:
+    description: Regulator supplying VDD_A
+
+  vdd-d-supply:
+    description: Regulator supplying VDD_D
+
+  vdd-io-supply:
+    description: Regulator supplying VDD_IO
+
+  vdd-cp-supply:
+    description: Regulator supplying VDD_CP
+
+  reset-gpios:
+    description:
+      One entry specifying the GPIO controlling /RESET. Although optional,
+      it is strongly recommended to use a hardware reset.
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: The clock supplied on MCLK1
+
+  clock-names:
+    const: mclk1
+
+  '#sound-dai-cells':
+    const: 1
+
+  cirrus,in-type:
+    description: |
+      A list of input type settings for each ADC input.
+      Inputs are one of these types:
+        CS48L32_IN_TYPE_DIFF : analog differential (default)
+        CS48L32_IN_TYPE_SE :   analog single-ended
+
+      The type of the left (L) and right (R) channel on each input is
+      independently configured, as are the two groups of pins muxable to
+      the input (referred to in the datasheet as "1" and "2").
+
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      - description:
+          IN1L_1 analog input type. One of the CS48L32_IN_TYPE_xxx.
+        minimum: 0
+        maximum: 1
+        default: 0
+      - description:
+          IN1R_1 analog input type. One of the CS48L32_IN_TYPE_xxx.
+        minimum: 0
+        maximum: 1
+        default: 0
+      - description:
+          IN1L_2 analog input type. One of the CS48L32_IN_TYPE_xxx.
+        minimum: 0
+        maximum: 1
+        default: 0
+      - description:
+          IN1R_2 analog input type. One of the CS48L32_IN_TYPE_xxx.
+        minimum: 0
+        maximum: 1
+        default: 0
+
+  cirrus,pdm-sup:
+    description: |
+      Indicate which MICBIAS output supplies bias to the microphone.
+      There is one cell per input (IN1, IN2, ...).
+
+      One of the CS48L32_MICBIAS_xxx values.
+        CS48L32_PDM_SUP_VOUT_MIC : mic biased from VOUT_MIC
+        CS48L32_PDM_SUP_MICBIAS1 : mic biased from MICBIAS1
+
+      Also see the INn_PDM_SUP field in the datasheet.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      - description: IN1 PDM supply source
+        minimum: 0
+        maximum: 1
+        default: 0
+      - description: IN2 PDM supply source
+        minimum: 0
+        maximum: 1
+        default: 0
+
+required:
+  - compatible
+  - reg
+  - vdd-a-supply
+  - vdd-d-supply
+  - vdd-io-supply
+  - vdd-cp-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/sound/cs48l32.h>
+
+    spi@e0006000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0xe0006000 0x1000>;
+
+        codec@1 {
+            compatible = "cirrus,cs48l32";
+
+            reg = <0x1>;
+            spi-max-frequency = <2500000>;
+
+            vdd-a-supply = <&regulator_1v8>;
+            vdd-d-supply = <&regulator_1v2>;
+            vdd-io-supply = <&regulator_1v8>;
+            vdd-cp-supply = <&regulator_1v8>;
+
+            reset-gpios = <&gpio 0 0>;
+
+            clocks = <&clks 0>;
+            clock-names = "mclk1";
+
+            interrupt-parent = <&gpio0>;
+            interrupts = <56 8>;
+
+            #sound-dai-cells = <1>;
+
+            cirrus,in-type = <
+                CS48L32_IN_TYPE_DIFF CS48L32_IN_TYPE_DIFF
+                CS48L32_IN_TYPE_SE   CS48L32_IN_TYPE_SE
+            >;
+
+            cirrus,pdm-sup = <
+              CS48L32_PDM_SUP_MICBIAS1 CS48L32_PDM_SUP_MICBIAS1
+            >;
+        };
+    };
+
+#
+# Minimal config
+#
+  - |
+    #include <dt-bindings/sound/cs48l32.h>
+
+    spi@e0006000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0xe0006000 0x1000>;
+
+        codec@1 {
+            compatible = "cirrus,cs48l32";
+
+            reg = <0x1>;
+
+            vdd-a-supply = <&regulator_1v8>;
+            vdd-d-supply = <&regulator_1v2>;
+            vdd-io-supply = <&regulator_1v8>;
+            vdd-cp-supply = <&regulator_1v8>;
+        };
+    };

include/dt-bindings/sound/cs48l32.h

···
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+/*
+ * Device Tree defines for CS48L32 DSP.
+ *
+ * Copyright (C) 2016-2018, 2022, 2025 Cirrus Logic, Inc. and
+ *               Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef DT_BINDINGS_SOUND_CS48L32_H
+#define DT_BINDINGS_SOUND_CS48L32_H
+
+/* Values for cirrus,in-type */
+#define CS48L32_IN_TYPE_DIFF		0
+#define CS48L32_IN_TYPE_SE		1
+
+/* Values for cirrus,pdm-sup */
+#define CS48L32_PDM_SUP_VOUT_MIC	0
+#define CS48L32_PDM_SUP_MICBIAS1	1
+
+#endif