From: Icenowy Zheng <icenowy@xxxxxxxx>
Some RTL8211E Ethernet PHY have an issue that needs a workaround
indicated with device tree.
Add the binding for a property that indicates this workaround.
Signed-off-by: Icenowy Zheng <icenowy@xxxxxxxx>
---
.../devicetree/bindings/net/realtek,rtl8211e.txt | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/realtek,rtl8211e.txt
diff --git a/Documentation/devicetree/bindings/net/realtek,rtl8211e.txt b/Documentation/devicetree/bindings/net/realtek,rtl8211e.txt
new file mode 100644
index 000000000000..c1913301bfe8
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/realtek,rtl8211e.txt
@@ -0,0 +1,22 @@
+Realtek RTL8211E Ethernet PHY
+
+One batch of RTL8211E is slight broken, that needs some special (and
+full of magic numbers) tweaking in order to make GbE to operate properly.
+The only well-known board that used the broken batch is Pine64+.
+Configure it through an Ethernet OF device node.
+
+Optional properties:
+
+- realtek,disable-rx-delay:
+ If set, RX delay will be completely disabled (according to Realtek). This
+ will affect the performance on non-broken boards.
+ default: do not disable RX delay.
+
+Examples:
+Pine64+ with broken RTL8211E:
+&mdio {
+ ext_phy: ethernet-phy@0 {
+ reg = <0>;
+ realtek,disable-rx-delay;
+ };
+};
--
2.12.2
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