ASoC: cs35l41: Add bindings for CS35L41

Devicetree binding documentation for CS35L41 driver

CS35L41 is a 11-V Boosted Mono Class D Amplifier with
DSP Speaker Protection and Equalization

Signed-off-by: David Rhodes <drhodes@opensource.cirrus.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210907225719.2018115-3-drhodes@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/cs35l41.yaml b/Documentation/devicetree/bindings/sound/cs35l41.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cs35l41.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic CS35L41 Speaker Amplifier
+
+maintainers:
+  - david.rhodes@cirrus.com
+
+description: |
+  CS35L41 is a boosted mono Class D amplifier with DSP
+  speaker protection and equalization
+
+properties:
+  compatible:
+    enum:
+      - cirrus,cs35l40
+      - cirrus,cs35l41
+
+  reg:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    description:
+      The first cell indicating the audio interface.
+    const: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  VA-supply:
+    description: voltage regulator phandle for the VA supply
+
+  VP-supply:
+    description: voltage regulator phandle for the VP supply
+
+  cirrus,boost-peak-milliamp:
+    description:
+      Boost-converter peak current limit in mA.
+      Configures the peak current by monitoring the current through the boost FET.
+      Range starts at 1600 mA and goes to a maximum of 4500 mA with increments
+      of 50 mA. See section 4.3.6 of the datasheet for details.
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 1600
+    maximum: 4500
+    default: 4500
+
+  cirrus,boost-ind-nanohenry:
+    description:
+      Boost inductor value, expressed in nH. Valid
+      values include 1000, 1200, 1500 and 2200.
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 1000
+    maximum: 2200
+
+  cirrus,boost-cap-microfarad:
+    description:
+      Total equivalent boost capacitance on the VBST
+      and VAMP pins, derated at 11 volts DC. The value must be rounded to the
+      nearest integer and expressed in uF.
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+
+  cirrus,asp-sdout-hiz:
+    description:
+      Audio serial port SDOUT Hi-Z control. Sets the Hi-Z
+      configuration for SDOUT pin of amplifier.
+      0 = Logic 0 during unused slots, and while all transmit channels disabled
+      1 = Hi-Z during unused slots but logic 0 while all transmit channels disabled
+      2 = (Default) Logic 0 during unused slots, but Hi-Z while all transmit channels disabled
+      3 = Hi-Z during unused slots and while all transmit channels disabled
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 3
+    default: 2
+
+  cirrus,gpio1-polarity-invert:
+    description:
+      Boolean which specifies whether the GPIO1
+      level is inverted. If this property is not present the level is not inverted.
+    type: boolean
+
+  cirrus,gpio1-output-enable:
+    description:
+      Boolean which specifies whether the GPIO1 pin
+      is configured as an output. If this property is not present the
+      pin will be configured as an input.
+    type: boolean
+
+  cirrus,gpio1-src-select:
+    description:
+      Configures the function of the GPIO1 pin.
+      Note that the options are different from the GPIO2 pin
+      0 = High Impedance (Default)
+      1 = GPIO
+      2 = Sync
+      3 = MCLK input
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 3
+
+  cirrus,gpio2-polarity-invert:
+    description:
+      Boolean which specifies whether the GPIO2
+      level is inverted. If this property is not present the level is not inverted.
+    type: boolean
+
+  cirrus,gpio2-output-enable:
+    description:
+      Boolean which specifies whether the GPIO2 pin
+      is configured as an output. If this property is not present the
+      pin will be configured as an input.
+    type: boolean
+
+  cirrus,gpio2-src-select:
+    description:
+      Configures the function of the GPIO2 pin.
+      Note that the options are different from the GPIO1 pin.
+      0 = High Impedance (Default)
+      1 = GPIO
+      2 = Open Drain INTB
+      3 = MCLK input
+      4 = Push-pull INTB (active low)
+      5 = Push-pull INT (active high)
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 5
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+  - cirrus,boost-peak-milliamp
+  - cirrus,boost-ind-nanohenry
+  - cirrus,boost-cap-microfarad
+
+unevaluatedProperties: false
+
+examples:
+  - |
+      cs35l41: cs35l41@2 {
+        compatible = "cirrus,cs35l41";
+        reg = <2>;
+        VA-supply = <&dummy_vreg>;
+        VP-supply = <&dummy_vreg>;
+        reset-gpios = <&gpio 110 0>;
+        cirrus,boost-peak-milliamp = <4500>;
+        cirrus,boost-ind-nanohenry = <1000>;
+        cirrus,boost-cap-microfarad = <15>;
+      };
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