netdev - [PATCH 2/4] dt-bindings: add binding for RTL8211E Ethernet PHY

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Message-Id: <20170421232436.10924-3-icenowy@aosc.io>
Date:   Sat, 22 Apr 2017 07:24:34 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com, Icenowy Zheng <icenowy@...c.xyz>
Subject: [PATCH 2/4] dt-bindings: add binding for RTL8211E Ethernet PHY

From: Icenowy Zheng <icenowy@...c.xyz>

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@...c.xyz>
---
 .../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