Document the FS Differential TX Output Resistance Tuning value found on
the eUSB2 repeater on Qualcomm PMICs. The tuning values have special
meanings, being different offsets of the resistance to the default value
in Ohms but the exact meaning is not relevant here, as the correct
tuning is determined by hardware engineers to make sure the electrical
properties are as expected.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
---
 Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
index 27f064a71c9fb8cb60e8333fb285f0510a4af94f..6bfd11657e2992735998063b3ca390e04a03930d 100644
--- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
@@ -52,6 +52,12 @@ properties:
     minimum: 0
     maximum: 7
 
+  qcom,tune-res-fsdif:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description: FS Differential TX Output Resistance Tuning
+    minimum: 0
+    maximum: 7
+
 required:
   - compatible
   - reg

-- 
2.50.0

On Wed, 09 Jul 2025 16:55:14 +0200, Luca Weiss wrote:
> Document the FS Differential TX Output Resistance Tuning value found on
> the eUSB2 repeater on Qualcomm PMICs. The tuning values have special
> meanings, being different offsets of the resistance to the default value
> in Ohms but the exact meaning is not relevant here, as the correct
> tuning is determined by hardware engineers to make sure the electrical
> properties are as expected.
> 
> Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
> ---
>  Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>