linux-kernel - [PATCH v3 1/5] dt-bindings: net: dwmac-meson: use picoseconds for the RGMII RX delay

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Message-Id: <20201223232905.2958651-2-martin.blumenstingl@googlemail.com>
Date:   Thu, 24 Dec 2020 00:29:01 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        andrew@...n.ch, f.fainelli@...il.com, jianxin.pan@...ogic.com,
        narmstrong@...libre.com, khilman@...libre.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        jbrunet@...libre.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v3 1/5] dt-bindings: net: dwmac-meson: use picoseconds for the RGMII RX delay

Amlogic Meson G12A, G12B and SM1 SoCs have a more advanced RGMII RX
delay register which allows picoseconds precision. Deprecate the old
"amlogic,rx-delay-ns" in favour of the generic "rx-internal-delay-ps"
property.

For older SoCs the only known supported values were 0ns and 2ns. The new
SoCs have support for RGMII RX delays between 0ps and 3000ps in 200ps
steps.

Don't carry over the description for the "rx-internal-delay-ps" property
and inherit that from ethernet-controller.yaml instead.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 .../bindings/net/amlogic,meson-dwmac.yaml     | 55 +++++++++++++++++--
 1 file changed, 49 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index 6b057b117aa0..a406e38e1848 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -74,17 +74,60 @@ allOf:
             Any configuration is ignored when the phy-mode is set to "rmii".
 
         amlogic,rx-delay-ns:
+          deprecated: true
           enum:
             - 0
             - 2
           default: 0
           description:
-            The internal RGMII RX clock delay (provided by this IP block) in
-            nanoseconds. When phy-mode is set to "rgmii" then the RX delay
-            should be explicitly configured. When the phy-mode is set to
-            either "rgmii-id" or "rgmii-rxid" the RX clock delay is already
-            provided by the PHY. Any configuration is ignored when the
-            phy-mode is set to "rmii".
+            The internal RGMII RX clock delay in nanoseconds. Deprecated, use
+            rx-internal-delay-ps instead.
+
+        rx-internal-delay-ps:
+          default: 0
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,meson8b-dwmac
+              - amlogic,meson8m2-dwmac
+              - amlogic,meson-gxbb-dwmac
+              - amlogic,meson-axg-dwmac
+    then:
+      properties:
+        rx-internal-delay-ps:
+          enum:
+            - 0
+            - 2000
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,meson-g12a-dwmac
+    then:
+      properties:
+        rx-internal-delay-ps:
+          enum:
+            - 0
+            - 200
+            - 400
+            - 600
+            - 800
+            - 1000
+            - 1200
+            - 1400
+            - 1600
+            - 1800
+            - 2000
+            - 2200
+            - 2400
+            - 2600
+            - 2800
+            - 3000
 
 properties:
   compatible:
-- 
2.29.2