linux-kernel - [PATCH v4 6/8] dt-bindings: iio: adc: document diff-channels corner case for some ADCs

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Message-ID: <20240905082404.119022-7-aardelean@baylibre.com>
Date: Thu,  5 Sep 2024 11:24:00 +0300
From: Alexandru Ardelean <aardelean@...libre.com>
To: linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: jic23@...nel.org,
	krzk+dt@...nel.org,
	robh@...nel.org,
	lars@...afoo.de,
	michael.hennerich@...log.com,
	gstols@...libre.com,
	Alexandru Ardelean <aardelean@...libre.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v4 6/8] dt-bindings: iio: adc: document diff-channels corner case for some ADCs

Some ADCs have channels with negative and positive inputs, which can be
used to measure differential voltage levels. These inputs/pins are
dedicated (to the given channel) and cannot be muxed as with other ADCs.

For those types of setups, the 'diff-channels' property can be specified to
be used with the channel number (or reg property) for both negative and
positive inputs/pins.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Alexandru Ardelean <aardelean@...libre.com>
---
 Documentation/devicetree/bindings/iio/adc/adc.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
index 8e7835cf36fd..b9bc02b5b07a 100644
--- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
@@ -37,6 +37,10 @@ properties:
       to both the positive and negative inputs of a differential ADC.
       The first value specifies the positive input pin, the second
       specifies the negative input pin.
+      There are also some ADCs, where the differential channel has dedicated
+      positive and negative inputs which can be used to measure differential
+      voltage levels. For those setups, this property can be configured with
+      the 'reg' property for both inputs (i.e. diff-channels = <reg reg>).
 
   single-channel:
     $ref: /schemas/types.yaml#/definitions/uint32
-- 
2.46.0