[PATCH v2 08/10] dt-bindings: iio: adc: ad7476: Add ROHM bd79105

[Matti Vaittinen <mazziesaccount@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 4403 bytes --]

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@gmail.com>

---
Revision history:
 v1 => v2:
 - BD79105 can provide data-ready IRQ (or GPIO) via DOUT-pin.
---
 .../bindings/iio/adc/adi,ad7476.yaml          | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
index d0cb32f136e5..c411a7467651 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:
@@ -115,6 +139,7 @@ allOf:
               - adi,ad7274
               - adi,ad7475
               - lltc,ltc2314-14
+              - rohm,bd79105
     then:
       properties:
         vref-supply: true
@@ -131,6 +156,7 @@ allOf:
               - adi,ad7274
               - adi,ad7475
               - lltc,ltc2314-14
+              - rohm,bd79105
     then:
       required:
         - vref-supply
@@ -141,12 +167,28 @@ allOf:
             enum:
               - adi,ad7475
               - adi,ad7495
+              - rohm,bd79105
     then:
       properties:
         vdrive-supply: true
     else:
       properties:
         vdrive-supply: false
+
+  # Devices which support polling the data-ready via GPIO
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rohm,bd79105
+    then:
+      properties:
+        rdy-gpios: true
+    else:
+      properties:
+        rdy-gpios: false
+
   - if:
       properties:
         compatible:
@@ -154,6 +196,7 @@ allOf:
             enum:
               - adi,ad7091
               - adi,ad7091r
+              - rohm,bd79105
     then:
       properties:
         adi,conversion-start-gpios: true
@@ -161,6 +204,17 @@ 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


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]