We need to set various bits in the hardware registers for this device to
operate properly depending on how it is installed. Add a handful of DT
properties to configure these things.

Cc: Daniel Campello <redacted>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: <redacted>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Gwendal Grignou <redacted>
Cc: Evan Green <redacted>
Signed-off-by: Stephen Boyd <redacted>
---

I haven't written any code to handle these properties yet. I'd rather do
that once the binding patch is reviewed. Patch based on iio.git testing
branch.

 .../iio/proximity/semtech,sx9310.yaml         | 182 ++++++++++++++++++
 1 file changed, 182 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml
index 5739074d3592..e74b81483c14 100644
--- a/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml
+++ b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml

@@ -40,6 +40,169 @@ properties:
   "#io-channel-cells":
     const: 1
 
+  semtech,cs0-ground:
+    description: Indicates the CS0 sensor is connected to ground.
+    type: boolean
+
+  semtech,combined-sensors:
+    allOf:
+      - $ref: /schemas/types.yaml#definitions/uint32
+      - enum: [0, 1, 2, 3]
+    default: 0
+    description:
+      Which sensors are combined. 0 for CS3, 1 for CS0+CS1, 2 for CS1+CS2,
+      and 3 for all sensors.
+
+  semtech,cs0-gain-factor:
+    allOf:
+      - $ref: /schemas/types.yaml#definitions/uint32
+      - enum: [1, 2, 4, 8]
+    default: 1
+    description:
+      Gain factor for CS0 (and combined if any) sensor.
+
+  semtech,cs1-gain-factor:
+    allOf:
+      - $ref: /schemas/types.yaml#definitions/uint32
+      - enum: [1, 2, 4, 8]