在 2017-04-22 08:22，Florian Fainelli 写道：
On 04/21/2017 04:24 PM, Icenowy Zheng wrote:
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.
Please don't introduce custom properties to do that, instead correct
specify the "phy-mode" such that it is e.g: "rgmii-txid" which
indicates
that there should be no RX internal delay, but a TX internal delay
added
by the PHY.
According to Realtek and Pine64 people, set that register is equal to
hardwire RDDLY line to low.
Is it the standard definition of RGMII-TXID?
(P.S. as it's only provided as a workaround, there's no implementation
known for RGMII-RXID and RGMII-ID)
Thanks,
Icenowy
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