[PATCH 1/4] dt-bindings: iio: dac: Add adi,ltc2664.yaml

[Kim Seer Paller <kimseer.paller@analog.com>]

Add documentation for ltc2664 and ltc2672.

Co-developed-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
 .../bindings/iio/dac/adi,ltc2664.yaml         | 230 ++++++++++++++++++
 MAINTAINERS                                   |   8 +
 2 files changed, 238 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml

diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
new file mode 100644
index 000000000..2f581a9e5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
@@ -0,0 +1,230 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,ltc2664.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC2664 and LTC2672 DAC
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+  - Kim Seer Paller <kimseer.paller@analog.com>
+
+description: |
+  Analog Devices LTC2664 4 channel, 16 bit, +-10V DAC
+  Analog Devices LTC2672 5 channel, 16 bit, 300mA DAC
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2664.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2672.pdf
+
+$defs:
+  toggle-operation:
+    type: object
+    description: Toggle mode channel setting.
+
+    properties:
+      reg:
+        description: Channel number.
+        minimum: 0
+        maximum: 4
+
+      adi,toggle-mode:
+        description:
+          Set the channel as a toggle enabled channel. Toggle operation enables
+          fast switching of a DAC output between two different DAC codes without
+          any SPI transaction.
+        type: boolean
+
+patternProperties:
+  "^channel@[0-4]$":
+    type: object
+
+properties:
+  compatible:
+    enum:
+      - adi,ltc2664
+      - adi,ltc2672
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 50000000
+
+  vcc-supply:
+    description: Analog Supply Voltage Input.
+
+  iovcc-supply:
+    description: Digital Input/Output Supply Voltage.
+
+  vref-supply:
+    description:
+      Reference Input/Output. The voltage at the REF pin sets the full-scale
+      range of all channels. If not provided the internal reference is used and
+      also provided on the VREF pin.
+
+  clr-gpios:
+    description:
+      If specified, it will be asserted during driver probe. As the line is
+      active low, it should be marked GPIO_ACTIVE_LOW.
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: adi,ltc2664
+    then:
+      properties:
+        adi,manual-span-operation-config:
+          description:
+            This property must mimic the MSPAN pin configurations.
+            By tying the MSPAN pins (MSP2, MSP1 and MSP0) to GND
+            and/or VCC, any output range can be hardware-configured
+            with different mid-scale or zero-scale reset options.
+            The hardware configuration is latched during power on reset
+            for proper operation.
+              0 - MPS2=GND, MPS1=GND, MSP0=GND
+              1 - MPS2=GND, MPS1=GND, MSP0=VCC
+              2 - MPS2=GND, MPS1=VCC, MSP0=GND
+              3 - MPS2=GND, MPS1=VCC, MSP0=VCC
+              4 - MPS2=VCC, MPS1=GND, MSP0=GND
+              5 - MPS2=VCC, MPS1=GND, MSP0=VCC
+              6 - MPS2=VCC, MPS1=VCC, MSP0=GND
+              7 - MPS2=VCC, MPS1=VCC, MSP0=VCC (enables SoftSpan feature)
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [0, 1, 2, 3, 4, 5, 6, 7]
+          default: 7
+
+      patternProperties:
+        "^channel@([0-3])$":
+          $ref: '#/$defs/toggle-operation'
+          unevaluatedProperties: false
+
+          description: Channel in toggle functionality.
+
+          properties:
+            adi,output-range-microvolt:
+              description: Specify the channel output full scale range.
+              oneOf:
+                - items:
+                    - const: 0
+                    - enum: [5000000, 10000000]
+                - items:
+                    - const: -5000000
+                    - const: 5000000
+                - items:
+                    - const: -10000000
+                    - const: 10000000
+                - items:
+                    - const: -2500000
+                    - const: 2500000
+
+          required:
+            - adi,output-range-microvolt
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: adi,ltc2672
+    then:
+      properties:
+        adi,rfsadj-ohms:
+          description: If FSADJ is tied to VCC, an internal RFSADJ (20 kΩ) is
+            selected, which results in nominal output ranges. When an external
+            resistor of 19 kΩ to 41 kΩ can be used instead by connecting the
+            resistor between FSADJ and GND it controls the scaling of the
+            ranges, and the internal resistor is automatically disconnected.
+          minimum: 19000
+          maximum: 41000
+          default: 20000
+
+      patternProperties:
+        "^channel@([0-4])$":
+          $ref: '#/$defs/toggle-operation'
+          unevaluatedProperties: false
+
+          description: Configuration properties for a channel in toggle mode
+
+          properties:
+            adi,output-range-microamp:
+              description: Specify the channel output full scale range.
+              $ref: /schemas/types.yaml#/definitions/uint32
+              enum: [3125000, 6250000, 12500000, 25000000, 50000000, 100000000,
+                     200000000, 300000000]
+
+          required:
+            - adi,output-range-microamp
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+  - vcc-supply
+  - iovcc-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+          #address-cells = <1>;
+          #size-cells = <0>;
+          dac@0 {
+                  compatible = "adi,ltc2664";
+                  reg = <0>;
+                  spi-max-frequency = <10000000>;
+
+                  vcc-supply = <&vcc>;
+                  iovcc-supply = <&vcc>;
+                  vref-supply = <&vref>;
+
+                  #address-cells = <1>;
+                  #size-cells = <0>;
+                  channel@0 {
+                          reg = <0>;
+                          adi,toggle-mode;
+                          adi,output-range-microvolt = <(-10000000) 10000000>;
+                  };
+
+                  channel@1 {
+                          reg = <1>;
+                          adi,output-range-microvolt = <0 10000000>;
+                  };
+          };
+    };
+  - |
+    spi {
+          #address-cells = <1>;
+          #size-cells = <0>;
+          dac@0 {
+                  compatible = "adi,ltc2672";
+                  reg = <0>;
+                  spi-max-frequency = <10000000>;
+
+                  vcc-supply = <&vcc>;
+                  iovcc-supply = <&vcc>;
+                  vref-supply = <&vref>;
+
+                  #address-cells = <1>;
+                  #size-cells = <0>;
+                  channel@0 {
+                          reg = <0>;
+                          adi,toggle-mode;
+                          adi,output-range-microamp = <3125000>;
+                  };
+
+                  channel@1 {
+                          reg = <1>;
+                          adi,output-range-microamp = <6250000>;
+                  };
+          };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index a7287cf44..bd8645f6e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12836,6 +12836,14 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/iio/dac/lltc,ltc1660.yaml
 F:	drivers/iio/dac/ltc1660.c
 
+LTC2664 IIO DAC DRIVER
+M:	Michael Hennerich <michael.hennerich@analog.com>
+M:	Kim Seer Paller <kimseer.paller@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
+
 LTC2688 IIO DAC DRIVER
 M:	Nuno Sá <nuno.sa@analog.com>
 L:	linux-iio@vger.kernel.org
-- 
2.34.1