Add devicetree bindings for adl8113.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---

Changes in v4:
- Add adi,external-bypass-a-gain-db and adi,external-bypass-b-gain-db properties
- Add example with external amplifier configuration
---
 .../bindings/iio/amplifiers/adi,adl8113.yaml  | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml

diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml b/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml
new file mode 100644
index 000000000000..3da5de01e31b
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/amplifiers/adi,adl8113.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices ADL8113 Low Noise Amplifier with integrated bypass switches
+
+maintainers:
+  - Antoniu Miclaus <antoniu.miclaus@analog.com>
+
+description: |
+  The ADL8113 is a 10MHz to 12GHz Low Noise Amplifier with integrated bypass
+  switches controlled by two GPIO pins (VA and VB). The device supports four
+  operation modes:
+    - Internal Amplifier: VA=0, VB=0 - Signal passes through the internal LNA
+    - Internal Bypass: VA=1, VB=1 - Signal bypasses through internal path
+    - External Bypass A: VA=0, VB=1 - Signal routes from RFIN to OUT_A and from IN_A to RFOUT
+    - External Bypass B: VA=1, VB=0 - Signal routes from RFIN to OUT_B and from IN_B to RFOUT
+
+    https://www.analog.com/en/products/adl8113.html
+
+properties:
+  compatible:
+    const: adi,adl8113
+
+  vdd1-supply: true
+
+  vdd2-supply: true
+
+  vss2-supply: true
+
+  va-gpios:
+    description:
+      GPIO connected to the VA control pin. Must be specified as GPIO_ACTIVE_HIGH.
+    maxItems: 1
+
+  vb-gpios:
+    description:
+      GPIO connected to the VB control pin. Must be specified as GPIO_ACTIVE_HIGH.
+    maxItems: 1
+
+  adi,external-bypass-a-gain-db:
+    description:
+      Gain in dB of external amplifier connected to bypass path A (OUT_A/IN_A).
+      When specified, this gain value becomes selectable via the hardwaregain
+      attribute and automatically routes through the external A path.
+
+  adi,external-bypass-b-gain-db:
+    description:
+      Gain in dB of external amplifier connected to bypass path B (OUT_B/IN_B).
+      When specified, this gain value becomes selectable via the hardwaregain
+      attribute and automatically routes through the external B path.
+
+required:
+  - compatible
+  - va-gpios
+  - vb-gpios
+  - vdd1-supply
+  - vdd2-supply
+  - vss2-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    /* Basic configuration with only internal paths */
+    amplifier {
+        compatible = "adi,adl8113";
+        va-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+        vb-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
+        vdd1-supply = <&vdd1_5v>;
+        vdd2-supply = <&vdd2_3v3>;
+        vss2-supply = <&vss2_neg>;
+    };
+
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    /* Configuration with external bypass amplifiers */
+    amplifier {
+        compatible = "adi,adl8113";
+        va-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
+        vb-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
+        vdd1-supply = <&vdd1_5v>;
+        vdd2-supply = <&vdd2_3v3>;
+        vss2-supply = <&vss2_neg>;
+        adi,external-bypass-a-gain-db = <20>;
+        adi,external-bypass-b-gain-db = <6>;
+    };
+...
-- 
2.43.0

On 11/21/25 3:52 AM, Antoniu Miclaus wrote:
> Add devicetree bindings for adl8113.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
> 

...

> +  adi,external-bypass-a-gain-db:

Hmm... are we sure we will never need a non-integer value? Maybe we should add
"-microdb$" to dtschema?

https://github.com/devicetree-org/dt-schema/blob/7033eb7cec1abe55f496309f0f6f271524f5d612/dtschema/schemas/property-units.yaml#L52

> +    description:
> +      Gain in dB of external amplifier connected to bypass path A (OUT_A/IN_A).
> +      When specified, this gain value becomes selectable via the hardwaregain
> +      attribute and automatically routes through the external A path.

The dt-bindings should not specify how the driver should operate. We can
leave out the last sentence. We could say though that when omitted it
means nothing is connected.