From ac41ac81e331319a1773d5a6a6744e8ce7389f08 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Mon, 18 Oct 2021 22:29:51 +0300
Subject: [PATCH] dt-bindings: net: dsa: sja1105: add {rx,tx}-internal-delay-ps

Add a schema validator to nxp,sja1105.yaml and to dsa.yaml for explicit
MAC-level RGMII delays. These properties must be per port and must be
present only for a phy-mode that represents RGMII.

We tell dsa.yaml that these port properties might be present, we also
define their valid values for SJA1105. We create a common definition for
the RX and TX valid range, since it's quite a mouthful.

We also modify the example to include the explicit RGMII delay properties.
On the fixed-link ports (in the example, port 4), having these explicit
delays is actually mandatory, since with the new behavior, the driver
shouts that it is interpreting what delays to apply based on phy-mode.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 .../devicetree/bindings/net/dsa/dsa.yaml      |  4 ++
 .../bindings/net/dsa/nxp,sja1105.yaml         | 42 +++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.yaml b/Documentation/devicetree/bindings/net/dsa/dsa.yaml
index 9cfd08cd31da0..2ad7f79ad371a 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.yaml
@@ -97,6 +97,10 @@ patternProperties:
 
           managed: true
 
+          rx-internal-delay-ps: true
+
+          tx-internal-delay-ps: true
+
         required:
           - reg
 
diff --git a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
index f97a22772e6f0..24cd733c11d10 100644
--- a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
@@ -74,10 +74,42 @@ properties:
           - compatible
           - reg
 
+patternProperties:
+  "^(ethernet-)?ports$":
+    patternProperties:
+      "^(ethernet-)?port@[0-9]+$":
+        allOf:
+          - if:
+              properties:
+                phy-mode:
+                  contains:
+                    enum:
+                      - rgmii
+                      - rgmii-rxid
+                      - rgmii-txid
+                      - rgmii-id
+            then:
+              properties:
+                rx-internal-delay-ps:
+                  $ref: "#/$defs/internal-delay-ps"
+                tx-internal-delay-ps:
+                  $ref: "#/$defs/internal-delay-ps"
+
 required:
   - compatible
   - reg
 
+$defs:
+  internal-delay-ps:
+    description:
+      Disable tunable delay lines using 0 ps, or enable them and select
+      the phase between 1640 ps (73.8 degree shift at 1Gbps) and 2260 ps
+      (101.7 degree shift) in increments of 0.9 degrees (20 ps).
+    enum:
+      [0, 1640, 1660, 1680, 1700, 1720, 1740, 1760, 1780, 1800, 1820, 1840,
+       1860, 1880, 1900, 1920, 1940, 1960, 1980, 2000, 2020, 2040, 2060, 2080,
+       2100, 2120, 2140, 2160, 2180, 2200, 2220, 2240, 2260]
+
 unevaluatedProperties: false
 
 examples:
@@ -97,30 +129,40 @@ examples:
                             port@0 {
                                     phy-handle = <&rgmii_phy6>;
                                     phy-mode = "rgmii-id";
+                                    rx-internal-delay-ps = <0>;
+                                    tx-internal-delay-ps = <0>;
                                     reg = <0>;
                             };
 
                             port@1 {
                                     phy-handle = <&rgmii_phy3>;
                                     phy-mode = "rgmii-id";
+                                    rx-internal-delay-ps = <0>;
+                                    tx-internal-delay-ps = <0>;
                                     reg = <1>;
                             };
 
                             port@2 {
                                     phy-handle = <&rgmii_phy4>;
                                     phy-mode = "rgmii-id";
+                                    rx-internal-delay-ps = <0>;
+                                    tx-internal-delay-ps = <0>;
                                     reg = <2>;
                             };
 
                             port@3 {
                                     phy-handle = <&rgmii_phy4>;
                                     phy-mode = "rgmii-id";
+                                    rx-internal-delay-ps = <0>;
+                                    tx-internal-delay-ps = <0>;
                                     reg = <3>;
                             };
 
                             port@4 {
                                     ethernet = <&enet2>;
                                     phy-mode = "rgmii";
+                                    rx-internal-delay-ps = <0>;
+                                    tx-internal-delay-ps = <0>;
                                     reg = <4>;
 
                                     fixed-link {
-- 
2.30.2