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Message-ID: <3f70f68665225be3091f8a0412e74037b6a2a88e.1754901948.git.mazziesaccount@gmail.com>
Date: Mon, 11 Aug 2025 11:52:04 +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 v4 09/11] 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. There are cases
where the IRQ can't be used (because it is delivered via SPI data-line).
Hence, some systems may use a GPIO for polling the data readiness.
Add a compatible for the bd79105 and add the data-ready GPIO to the
binding.
Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
Revision history:
v3 => v4:
- Drop the redundant 'true' branches
v2 => v3:
- No changes
v1 => v2:
- BD79105 can provide data-ready IRQ (or GPIO) via DOUT-pin.
---
.../bindings/iio/adc/adi,ad7476.yaml | 52 +++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
index db2a9662bd94..55880191c511 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
@@ -55,6 +56,11 @@ properties:
reg:
maxItems: 1
+ interrupts:
+ description:
+ The data-ready interrupt. Provided via DOUT pin.
+ maxItems: 1
+
vcc-supply:
description:
Main powersupply voltage for the chips, sometimes referred to as VDD on
@@ -75,6 +81,10 @@ properties:
description: A GPIO used to trigger the start of a conversion
maxItems: 1
+ rdy-gpios:
+ description: A GPIO for detecting the data-ready.
+ maxItems: 1
+
required:
- compatible
- reg
@@ -82,6 +92,20 @@ required:
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
+# Devices with an IRQ
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - rohm,bd79105
+ then:
+ properties:
+ interrupts: true
+ else:
+ properties:
+ interrupts: false
+
# Devices where reference is vcc
- if:
properties:
@@ -116,6 +140,7 @@ allOf:
- adi,ad7274
- adi,ad7475
- lltc,ltc2314-14
+ - rohm,bd79105
then:
properties:
vref-supply: false
@@ -129,6 +154,7 @@ allOf:
- adi,ad7274
- adi,ad7475
- lltc,ltc2314-14
+ - rohm,bd79105
then:
required:
- vref-supply
@@ -140,9 +166,23 @@ allOf:
enum:
- adi,ad7475
- adi,ad7495
+ - rohm,bd79105
then:
properties:
vdrive-supply: false
+
+ # Devices which support polling the data-ready via GPIO
+ - if:
+ not:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - rohm,bd79105
+ then:
+ properties:
+ rdy-gpios: false
+
- if:
not:
properties:
@@ -151,10 +191,22 @@ allOf:
enum:
- adi,ad7091
- adi,ad7091r
+ - rohm,bd79105
then:
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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