linux-kernel - [PATCH 6/8] dt-bindings: iio: adc: ad7476: Add ROHM bd79105

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Message-ID: <3066337cb183afa5f53a4e6cf94ce15a36d14ec8.1754463393.git.mazziesaccount@gmail.com>
Date: Wed, 6 Aug 2025 10:04:28 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] dt-bindings: iio: adc: ad7476: Add ROHM bd79105

The ROHM BD79105 is a simple, 16-bit, 1-channel ADC with a 'CONVSTART'
pin used to start the ADC conversion. Other than the 'CONVSTART', there
are 3 supply pins (one used as a reference), analog inputs, ground and
communication pins. It's worth noting that the pin somewhat confusingly
labeled as 'DIN', is a pin which should be used as a chip-select. The IC
does not have any writable registers.

The device is designed so that the output pin can, in addition to
outputting the data, be used as a 'data-ready'-IRQ. This, however, would
require the IRQ to be masked from host side for the duration of the data
reads - and it wouldn't also work when the SPI is shared. (As access to
the other SPI devices would cause data line changes to be detected as
IRQs - and the BD79105 provides no means to detect if it has generated
an IRQ).

Hence the device-tree does not contain any IRQ properties.

Add a compatible for the bd79105.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
 .../devicetree/bindings/iio/adc/adi,ad7476.yaml  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
index d0cb32f136e5..16d3866dd633 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
@@ -41,6 +41,7 @@ properties:
               - adi,ad7910
               - adi,ad7920
               - adi,ad7940
+              - rohm,bd79105
               - ti,adc081s
               - ti,adc101s
               - ti,adc121s
@@ -115,6 +116,7 @@ allOf:
               - adi,ad7274
               - adi,ad7475
               - lltc,ltc2314-14
+              - rohm,bd79105
     then:
       properties:
         vref-supply: true
@@ -131,6 +133,7 @@ allOf:
               - adi,ad7274
               - adi,ad7475
               - lltc,ltc2314-14
+              - rohm,bd79105
     then:
       required:
         - vref-supply
@@ -141,6 +144,7 @@ allOf:
             enum:
               - adi,ad7475
               - adi,ad7495
+              - rohm,bd79105
     then:
       properties:
         vdrive-supply: true
@@ -154,6 +158,7 @@ allOf:
             enum:
               - adi,ad7091
               - adi,ad7091r
+              - rohm,bd79105
     then:
       properties:
         adi,conversion-start-gpios: true
@@ -161,6 +166,17 @@ allOf:
       properties:
         adi,conversion-start-gpios: false
 
+  # Devices with a convstart GPIO where it is not optional
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rohm,bd79105
+    then:
+      required:
+        - adi,conversion-start-gpios
+
 unevaluatedProperties: false
 
 examples:
-- 
2.50.1


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