[PATCH v4 01/10] dt-bindings: ROHM BD79124 ADC/GPO

Matti Vaittinen
2025-02-24T18:32:38Z

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Add binding document for the ROHM BD79124 ADC / GPO.

ROHM BD79124 is a 8-channel, 12-bit ADC. The input pins can also be used
as general purpose outputs.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
Revision history:
v2 => v3:
- Restrict channel numbers to 0-7 as suggested by Conor
RFC v1 => v2:
- drop MFD and represent directly as ADC
- drop pinmux and treat all non ADC channel pins as GPOs
---
.../bindings/iio/adc/rohm,bd79124.yaml | 114 ++++++++++++++++++
1 file changed, 114 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml b/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml
new file mode 100644
index 000000000000..503285823376
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml
@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/rohm,bd79124.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD79124 ADC/GPO
+
+maintainers:
+ - Matti Vaittinen <mazziesaccount@gmail.com>
+
+description: |
+ The ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports
+ an automatic measurement mode, with an alarm interrupt for out-of-window
+ measurements. ADC input pins can be also configured as general purpose
+ outputs.
+
+properties:
+ compatible:
+ const: rohm,bd79124
+
+ reg:
+ description:
+ I2C slave address.
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 1
+ description:
+ The pin number.
+
+ vdd-supply: true
+
+ iovdd-supply: true
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+patternProperties:
+ "^channel@[0-7]+$":
+ type: object
+ $ref: /schemas/iio/adc/adc.yaml#
+ description: Represents ADC channel.
+
+ properties:
+ reg:
+ description: AIN pin number
+ minimum: 0
+ maximum: 7
+
+ required:
+ - reg
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - iovdd-supply
+ - vdd-supply
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/leds/common.h>
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ adc: adc@10 {
+ compatible = "rohm,bd79124";
+ reg = <0x10>;
+
+ interrupt-parent = <&gpio1>;
+ interrupts = <29 8>;
+
+ vdd-supply = <&dummyreg>;
+ iovdd-supply = <&dummyreg>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ };
+ channel@1 {
+ reg = <1>;
+ };
+ channel@2 {
+ reg = <2>;
+ };
+ channel@3 {
+ reg = <3>;
+ };
+ channel@4 {
+ reg = <4>;
+ };
+ channel@5 {
+ reg = <5>;
+ };
+ channel@6 {
+ reg = <6>;
+ };
+ };
+ };
--
2.48.1

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