Based on commit 83a368a3fc8a ("docs: dt-bindings: add DTS Coding Style
document") using underscore ('_') in node name is not recommended that's
why switch to dash ('-').

Signed-off-by: Michal Simek <michal.simek@amd.com>
---

  .../bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml        | 4 ++--
  Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml  | 2 +-
  2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
index 8e584857ddd4..3d578f98ae2c 100644
--- a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
+++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml

@@ -41,7 +41,7 @@ properties:
    "#power-domain-cells":
      const: 1
  
-  versal_fpga:
+  versal-fpga:
      $ref: /schemas/fpga/xlnx,versal-fpga.yaml#
      description: Compatible of the FPGA device.
      type: object

@@ -84,7 +84,7 @@ examples:
        compatible = "xlnx,versal-firmware";
        method = "smc";
  
-      versal_fpga: versal_fpga {
+      versal_fpga: versal-fpga {
          compatible = "xlnx,versal-fpga";
        };
  

diff --git a/Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml b/Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml
index 26f18834caa3..80833462f620 100644
--- a/Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml
+++ b/Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml

@@ -26,7 +26,7 @@ additionalProperties: false
  
  examples:
    - |
-    versal_fpga: versal_fpga {
+    versal_fpga: versal-fpga {
           compatible = "xlnx,versal-fpga";
      };