[PATCH net-next v8 1/6] dt-bindings: ethernet: eswin: relax internal delay model to range-based constraints

[lizhi2@eswincomputing.com]

From: Zhi Li <lizhi2@eswincomputing.com>

Relax internal delay constraints for EIC7700 Ethernet binding.

Replace fixed enumeration of rx-internal-delay-ps and tx-internal-delay-ps
with a range-based definition (0-2540 ps, 20 ps steps) to reflect actual
hardware capability.

Mark rx/tx internal delay properties as optional, as they are board-
specific tuning parameters rather than mandatory configuration.

Update the device tree example to align with the relaxed constraint model
and remove delay properties from the example to avoid implying they are
required.

No functional change to existing DT users.

Signed-off-by: Zhi Li <lizhi2@eswincomputing.com>
---
 .../bindings/net/eswin,eic7700-eth.yaml       | 25 ++++++++++---------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/eswin,eic7700-eth.yaml b/Documentation/devicetree/bindings/net/eswin,eic7700-eth.yaml
index 65882ff79d8d..4e02fedae5c6 100644
--- a/Documentation/devicetree/bindings/net/eswin,eic7700-eth.yaml
+++ b/Documentation/devicetree/bindings/net/eswin,eic7700-eth.yaml
@@ -63,10 +63,14 @@ properties:
       - const: stmmaceth
 
   rx-internal-delay-ps:
-    enum: [0, 200, 600, 1200, 1600, 1800, 2000, 2200, 2400]
+    minimum: 0
+    maximum: 2540
+    multipleOf: 20
 
   tx-internal-delay-ps:
-    enum: [0, 200, 600, 1200, 1600, 1800, 2000, 2200, 2400]
+    minimum: 0
+    maximum: 2540
+    multipleOf: 20
 
   eswin,hsp-sp-csr:
     description:
@@ -105,8 +109,6 @@ required:
   - phy-mode
   - resets
   - reset-names
-  - rx-internal-delay-ps
-  - tx-internal-delay-ps
   - eswin,hsp-sp-csr
 
 unevaluatedProperties: false
@@ -116,23 +118,22 @@ examples:
     ethernet@50400000 {
         compatible = "eswin,eic7700-qos-eth", "snps,dwmac-5.20";
         reg = <0x50400000 0x10000>;
-        clocks = <&d0_clock 186>, <&d0_clock 171>, <&d0_clock 40>,
-                <&d0_clock 193>;
-        clock-names = "axi", "cfg", "stmmaceth", "tx";
         interrupt-parent = <&plic>;
         interrupts = <61>;
         interrupt-names = "macirq";
-        phy-mode = "rgmii-id";
-        phy-handle = <&phy0>;
+        clocks = <&d0_clock 186>, <&d0_clock 171>, <&d0_clock 40>,
+                <&d0_clock 193>;
+        clock-names = "axi", "cfg", "stmmaceth", "tx";
         resets = <&reset 95>;
         reset-names = "stmmaceth";
-        rx-internal-delay-ps = <200>;
-        tx-internal-delay-ps = <200>;
         eswin,hsp-sp-csr = <&hsp_sp_csr 0x100 0x108 0x118 0x114 0x11c>;
-        snps,axi-config = <&stmmac_axi_setup>;
+        phy-handle = <&phy0>;
+        phy-mode = "rgmii-id";
         snps,aal;
         snps,fixed-burst;
         snps,tso;
+        snps,axi-config = <&stmmac_axi_setup>;
+
         stmmac_axi_setup: stmmac-axi-config {
             snps,blen = <0 0 0 0 16 8 4>;
             snps,rd_osr_lmt = <2>;
-- 
2.25.1