linux-kernel - [PATCH v8 4/6] dt-bindings: iio: adc: Add single-channel property

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Message-Id: <20240514120222.56488-5-alisa.roman@analog.com>
Date: Tue, 14 May 2024 15:02:20 +0300
From: Alisa-Dariana Roman <alisadariana@...il.com>
To: michael.hennerich@...log.com,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	jic23@...nel.org,
	robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	lgirdwood@...il.com,
	broonie@...nel.org,
	andy@...nel.org,
	nuno.sa@...log.com,
	marcelo.schmitt@...log.com,
	bigunclemax@...il.com,
	dlechner@...libre.com,
	okan.sahin@...log.com,
	fr0st61te@...il.com,
	alisa.roman@...log.com,
	marcus.folkesson@...il.com,
	schnelle@...ux.ibm.com,
	liambeguin@...il.com
Subject: [PATCH v8 4/6] dt-bindings: iio: adc: Add single-channel property

Devices that have both single-ended channels and differential channels
cause a bit of confusion when the channels are configured in the
devicetree.

Clarify difference between these two types of channels for such devices
by adding single-channel property alongside diff-channels. They should
be mutually exclusive.

Devices that have only single-ended channels can still use reg property
to reference a channel like before.

Suggested-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
---
 .../devicetree/bindings/iio/adc/adc.yaml      | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
index 36775f8f71df..0a77592f7388 100644
--- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
@@ -38,6 +38,14 @@ properties:
       The first value specifies the positive input pin, the second
       specifies the negative input pin.
 
+  single-channel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      When devices combine single-ended and differential channels, allow the
+      channel for a single element to be specified, independent of reg (as for
+      differential channels). If this and diff-channels are not present reg
+      shall be used instead.
+
   settling-time-us:
     description:
       Time between enabling the channel and first stable readings.
@@ -50,4 +58,15 @@ properties:
       device design and can interact with other characteristics such as
       settling time.
 
+anyOf:
+  - oneOf:
+      - required:
+          - reg
+          - diff-channels
+      - required:
+          - reg
+          - single-channel
+  - required:
+      - reg
+
 additionalProperties: true
-- 
2.34.1