[PATCH RFC 1/3] dt-bindings: iio: adc: add AD762x/AD796x ADCs

[Trevor Gamblin <tgamblin@baylibre.com>]

This adds a binding specification for the Analog Devices Inc. AD7625,
AD7626, AD7960, and AD7961 ADCs.

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
---
 .../devicetree/bindings/iio/adc/adi,ad7625.yaml    | 176 +++++++++++++++++++++
 MAINTAINERS                                        |   9 ++
 2 files changed, 185 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7625.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7625.yaml
new file mode 100644
index 000000000000..e88db0ac2534
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7625.yaml
@@ -0,0 +1,176 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7625.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices Fast PulSAR Analog to Digital Converters
+
+maintainers:
+  - Michael Hennerich <Michael.Hennerich@analog.com>
+  - Nuno Sá <nuno.sa@analog.com>
+
+description: |
+  A family of single channel differential analog to digital converters
+  in a LFCSP package. Note that these bindings are for the device when
+  used with the PulSAR LVDS project:
+  http://analogdevicesinc.github.io/hdl/projects/pulsar_lvds/index.html.
+
+  * https://www.analog.com/en/products/ad7625.html
+  * https://www.analog.com/en/products/ad7626.html
+  * https://www.analog.com/en/products/ad7960.html
+  * https://www.analog.com/en/products/ad7961.html
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7625
+      - adi,ad7626
+      - adi,ad7960
+      - adi,ad7961
+
+  vdd1-supply:
+    description: A supply that powers the analog and digital circuitry.
+
+  vdd2-supply:
+    description: A supply that powers the analog and digital circuitry.
+
+  vio-supply:
+    description: A supply for the inputs and outputs.
+
+  ref-supply:
+    description:
+      Voltage regulator for the external reference voltage (REF).
+
+  refin-supply:
+    description:
+      Voltage regulator for the reference buffer input (REFIN).
+
+  clocks:
+    description:
+      The clock connected to the CLK pins, gated by the clk_gate PWM.
+    maxItems: 1
+
+  pwms:
+    maxItems: 2
+
+  pwm-names:
+    maxItems: 2
+    items:
+      - const: cnv
+        description: PWM connected to the CNV input on the ADC.
+      - const: clk_gate
+        description: PWM that gates the clock connected to the ADC's CLK input.
+
+  io-backends:
+    description:
+      The AXI ADC IP block connected to the D+/- and DCO+/- lines of the ADC.
+    maxItems: 1
+
+  adi,en0-always-on:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates if EN0 is hard-wired to the high state. If neither this
+      nor en0-gpios are present, then EN0 is hard-wired low.
+
+  adi,en1-always-on:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates if EN1 is hard-wired to the high state. If neither this
+      nor en1-gpios are present, then EN1 is hard-wired low.
+
+  adi,en2-always-on:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates if EN2 is hard-wired to the high state. If neither this
+      nor en2-gpios are present, then EN2 is hard-wired low.
+
+  adi,en3-always-on:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicates if EN3 is hard-wired to the high state. If neither this
+      nor en3-gpios are present, then EN3 is hard-wired low.
+
+  en0-gpios:
+    description:
+      Configurable EN0 pin.
+
+  en1-gpios:
+    description:
+      Configurable EN1 pin.
+
+  en2-gpios:
+    description:
+      Configurable EN2 pin.
+
+  en3-gpios:
+    description:
+      Configurable EN3 pin.
+
+required:
+  - compatible
+  - vdd1-supply
+  - vdd2-supply
+  - vio-supply
+  - clocks
+  - pwms
+  - pwm-names
+  - io-backends
+
+- if:
+  properties:
+    compatible:
+      contains:
+        enum:
+	  - adi,ad7625
+	  - adi,ad7626
+  then:
+    properties:
+      en2-gpios: false
+      en3-gpios: false
+      adi,en2-always-on: false
+      adi,en3-always-on: false
+    allOf:
+      # ref-supply and refin-supply are mutually-exclusive (neither is also
+      # valid)
+      - if:
+          required:
+            - ref-supply
+        then:
+          properties:
+            refin-supply: false
+      - if:
+          required:
+            - refin-supply
+        then:
+          properties:
+            ref-supply: false
+
+- if:
+  properties:
+    compatible:
+      contains:
+        enum:
+	  - adi,ad7960
+	  - adi,ad7961
+  then:
+    oneOf:
+      required:
+        - ref-supply
+      required:
+        - refin-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    adc {
+        compatible = "adi,ad7625";
+        vdd1-supply = <&supply_5V>;
+        vdd2-supply = <&supply_2_5V>;
+        vio-supply = <&supply_2_5V>;
+        io-backends = <&axi_adc>;
+        clock = <&ref_clk>;
+        pwms = <&axi_pwm_gen 0 0>, <&axi_pwm_gen 1 0>;
+        pwm-names = "cnv", "clk_gate";
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 42decde38320..2361f92751dd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1260,6 +1260,15 @@ F:	Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
 F:	drivers/iio/addac/ad74413r.c
 F:	include/dt-bindings/iio/addac/adi,ad74413r.h
 
+ANALOG DEVICES INC AD7625 DRIVER
+M:	Michael Hennerich <Michael.Hennerich@analog.com>
+M:	Nuno Sá <nuno.sa@analog.com>
+R:	Trevor Gamblin <tgamblin@baylibre.com>
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+W:	http://analogdevicesinc.github.io/hdl/projects/pulsar_lvds/index.html
+F:	Documentation/devicetree/bindings/iio/adc/adi,ad7625.yaml
+
 ANALOG DEVICES INC AD7768-1 DRIVER
 M:	Michael Hennerich <Michael.Hennerich@analog.com>
 L:	linux-iio@vger.kernel.org

-- 
2.39.2