[PATCH v2 2/3] dt-bindings: dp83867: add binding for output-impedance

[Steffen Trumtrar]

Currently, the output-impedance can only be set to default, minimum or
maximum or via a nvmem cell.
In cases where there is no backend for a nvmem cell, a value can not be
set.

Add a DT binding, 'ti,output-impedance-ohms', for specifying the
output-impedance via a fixed value. The existing boolean values for
minimum and maximum still take precedence over the new value.

Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/net/ti,dp83867.yaml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.yaml b/Documentation/devicetree/bindings/net/ti,dp83867.yaml
index 7a6fe516bab27..49fafe3ce6f47 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.yaml
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.yaml
@@ -38,6 +38,16 @@ properties:
     items:
       - const: io_impedance_ctrl
 
+  ti,output-impedance-ohms:
+    description: |
+      MAC Interface Impedance control to set the programmable output impedance.
+      Valid range is 0x00 to 0x1f (32 steps).
+      - 0x1f = 35 ohms (minimum impedance)
+      - 0x00 = 70 ohms (maximum impedance)
+      - Step size varies with process.
+    minimum: 0
+    maximum: 31
+
   ti,min-output-impedance:
     type: boolean
     description: |
@@ -121,6 +131,12 @@ allOf:
       required: [nvmem-cells, "ti,min-output-impedance"]
   - not:
       required: [nvmem-cells, "ti,max-output-impedance"]
+  - not:
+      required: [nvmem-cells, "ti,output-impedance-ohms"]
+  - not:
+      required: ["ti,output-impedance-ohms", "ti,min-output-impedance"]
+  - not:
+      required: ["ti,output-impedance-ohms", "ti,max-output-impedance"]
 
 required:
   - reg

-- 
2.54.0