[PATCH 1/5] dt-bindings: Add ROHM BD7970x variants

[Matti Vaittinen]

The ROHM BD79700, BD79701 and BD79702 are subsets of the BD79703 DAC.
The main difference is the number of the channels. BD79703 has 6
channels.

The BD79702 has 4, BD79701 3 and BD79700 2 channels. Additionally, the
BD79700 and BD79701 do not have separate Vfs pin but use the Vcc also
for the full-scale voltage.

Add properties for the BD79700, BD79701 and BD79702.

Signed-off-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>
---
 .../bindings/iio/dac/rohm,bd79703.yaml        | 33 +++++++++++++++----
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/dac/rohm,bd79703.yaml b/Documentation/devicetree/bindings/iio/dac/rohm,bd79703.yaml
index 188b00333dfb..c00fa50e42e8 100644
--- a/Documentation/devicetree/bindings/iio/dac/rohm,bd79703.yaml
+++ b/Documentation/devicetree/bindings/iio/dac/rohm,bd79703.yaml
@@ -5,19 +5,26 @@
 $id: http://devicetree.org/schemas/iio/dac/rohm,bd79703.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: ROHM BD79703 DAC device driver
+title: ROHM BD79700, BD79701, BD79702 and BD79703 DACs
 
 maintainers:
   - Matti Vaittinen <mazziesaccount@xxxxxxxxx>
 
 description: |
-  The ROHM BD79703 is a 6 channel, 8-bit DAC.
-  Datasheet can be found here:
+  The ROHM BD7970[0,1,2,3] are 8-bit DACs. The BD79700 has 2 channels,
+  BD79701 3 channels, BD79702 4 channels and BD79703 has 6 channels.
+  Datasheets for BD79702 and BD79703 can be found from
   https://fscdn.rohm.com/en/products/databook/datasheet/ic/data_converter/dac/bd79702fv-lb_bd79703fv-lb-e.pdf
+  and for the BD79700 and the BD79701 from
+  https://fscdn.rohm.com/en/products/databook/datasheet/ic/data_converter/dac/bd79700fvm-lb_bd79701fvm-lb-e.pdf
 
 properties:
   compatible:
-    const: rohm,bd79703
+    enum:
+      - rohm,bd79700
+      - rohm,bd79701
+      - rohm,bd79702
+      - rohm,bd79703
 
   reg:
     maxItems: 1
@@ -27,19 +34,31 @@ properties:
 
   vfs-supply:
     description:
-      The regulator to use as a full scale voltage. The voltage should be between 2.7V .. VCC
+      The regulator to use as a full scale voltage. The voltage should be
+      between 2.7V .. VCC. Not present on BD79700 and BD79701.
 
   vcc-supply:
     description:
-      The regulator supplying the operating voltage. Should be between 2.7V ... 5.5V
+      The regulator supplying the operating voltage. Should be between
+      2.7V ... 5.5V. Is used also as a Vfs on BD79700 and BD79701.
 
 required:
   - compatible
   - reg
   - spi-max-frequency
-  - vfs-supply
   - vcc-supply
 
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - rohm,bd79702
+          - rohm,bd79703
+then:
+  required:
+    - vfs-supply
+
 allOf:
   - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
-- 
2.49.0

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