[PATCH v4 1/3] dt-bindings: iio: adc: add AD762x/AD796x ADCs

Trevor Gamblin
2024-09-04T19:14:24Z

Add 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..8848562af28f
--- /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.
+
+ * 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: true
+ vdd2-supply: true
+ vio-supply: true
+
+ 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:
+ items:
+ - description: PWM connected to the CNV input on the ADC.
+ - description: PWM that gates the clock connected to the ADC's CLK input.
+
+ pwm-names:
+ items:
+ - const: cnv
+ - const: clk_gate
+
+ io-backends:
+ description:
+ The AXI ADC IP block connected to the D+/- and DCO+/- lines of the
+ ADC. An example backend can be found at
+ http://analogdevicesinc.github.io/hdl/projects/pulsar_lvds/index.html.
+ maxItems: 1
+
+ adi,no-dco:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Indicates the wiring of the DCO+/- lines. If true, then they are
+ grounded and the device is in self-clocked mode. If this is not
+ present, then the device is in echoed clock mode.
+
+ 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
+
+allOf:
+ - if:
+ required:
+ - ref-supply
+ then:
+ properties:
+ refin-supply: false
+ - if:
+ required:
+ - refin-supply
+ then:
+ properties:
+ ref-supply: false
+ - 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
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - adi,ad7960
+ - adi,ad7961
+ then:
+ # ad796x parts must have one of the two supplies
+ oneOf:
+ - required: [ref-supply]
+ - required: [refin-supply]
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ adc {
+ compatible = "adi,ad7625";
+ vdd1-supply = <&supply_5V>;
+ vdd2-supply = <&supply_2_5V>;
+ vio-supply = <&supply_2_5V>;
+ io-backends = <&axi_adc>;
+ clocks = <&ref_clk>;
+ pwms = <&axi_pwm_gen 0 0>, <&axi_pwm_gen 1 0>;
+ pwm-names = "cnv", "clk_gate";
+ en0-gpios = <&gpio0 86 GPIO_ACTIVE_HIGH>;
+ en1-gpios = <&gpio0 87 GPIO_ACTIVE_HIGH>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index fa2c8d902122..77557e85220e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1271,6 +1271,15 @@ 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