From 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 13 May 2024 10:30:14 +0000
Subject: [PATCH] modify sin led gpio
---
kernel/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 57 insertions(+), 3 deletions(-)
diff --git a/kernel/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt b/kernel/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
index e22d8cf..b921731 100644
--- a/kernel/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
+++ b/kernel/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
@@ -1,4 +1,4 @@
-Micrel KSZ9021/KSZ9031 Gigabit Ethernet PHY
+Micrel KSZ9021/KSZ9031/KSZ9131 Gigabit Ethernet PHY
Some boards require special tuning values, particularly when it comes
to clock delays. You can specify clock delay values in the PHY OF
@@ -12,8 +12,36 @@
KSZ9021:
All skew control options are specified in picoseconds. The minimum
- value is 0, the maximum value is 3000, and it is incremented by 200ps
- steps.
+ value is 0, the maximum value is 3000, and it can be specified in 200ps
+ steps, *but* these values are in not fact what you get because this chip's
+ skew values actually increase in 120ps steps, starting from -840ps. The
+ incorrect values came from an error in the original KSZ9021 datasheet
+ before it was corrected in revision 1.2 (Feb 2014), but it is too late to
+ change the driver now because of the many existing device trees that have
+ been created using values that go up in increments of 200.
+
+ The following table shows the actual skew delay you will get for each of the
+ possible devicetree values, and the number that will be programmed into the
+ corresponding pad skew register:
+
+ Device Tree Value Delay Pad Skew Register Value
+ -----------------------------------------------------
+ 0 -840ps 0000
+ 200 -720ps 0001
+ 400 -600ps 0010
+ 600 -480ps 0011
+ 800 -360ps 0100
+ 1000 -240ps 0101
+ 1200 -120ps 0110
+ 1400 0ps 0111
+ 1600 120ps 1000
+ 1800 240ps 1001
+ 2000 360ps 1010
+ 2200 480ps 1011
+ 2400 600ps 1100
+ 2600 720ps 1101
+ 2800 840ps 1110
+ 3000 960ps 1111
Optional properties:
@@ -64,6 +92,32 @@
Attention: The link partner must be configurable as slave otherwise
no link will be established.
+KSZ9131:
+
+ All skew control options are specified in picoseconds. The increment
+ step is 100ps. Unlike KSZ9031, the values represent picoseccond delays.
+ A negative value can be assigned as rxc-skew-psec = <(-100)>;.
+
+ Optional properties:
+
+ Range of the value -700 to 2400, default value 0:
+
+ - rxc-skew-psec : Skew control of RX clock pad
+ - txc-skew-psec : Skew control of TX clock pad
+
+ Range of the value -700 to 800, default value 0:
+
+ - rxdv-skew-psec : Skew control of RX CTL pad
+ - txen-skew-psec : Skew control of TX CTL pad
+ - rxd0-skew-psec : Skew control of RX data 0 pad
+ - rxd1-skew-psec : Skew control of RX data 1 pad
+ - rxd2-skew-psec : Skew control of RX data 2 pad
+ - rxd3-skew-psec : Skew control of RX data 3 pad
+ - txd0-skew-psec : Skew control of TX data 0 pad
+ - txd1-skew-psec : Skew control of TX data 1 pad
+ - txd2-skew-psec : Skew control of TX data 2 pad
+ - txd3-skew-psec : Skew control of TX data 3 pad
+
Examples:
mdio {
--
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