[PATCH 2/5] arm64: dts: r8a7795: salvator-x: Fix EthernetAVB PHY timing

[Simon Horman]

From: Kazuya Mizuguchi <kazuya.mizuguchi.ks at renesas.com>

Set PHY rxc-skew-ps to 1500 and all other values to their default values.

This is intended to to address failures in the case of 1Gbps communication
using the by salvator-x board with the KSZ9031RNX phy. This has been
reported to occur with both the r8a7795 (H3) and r8a7796 (M3-W) SoCs.

Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks at renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df at renesas.com>
Signed-off-by: Simon Horman <horms+renesas at verge.net.au>

---
v1 [Simon Horman]
* Do not set values to defaults, omit them and let the driver set the defaults
* Rewrote changelog

  N.B. The communications failures have been reported by the BSP team,
       however I did not observe them during testing with a
       salvator-x/M3-W-ES1.0

       I have also exercised this on salvator-x/H3-ES1.0, which
       supports a maximum communication speed of 100Mbit/s. I did
       not observe communications failures during that testing.

       My test-case was to bring up the system using NFS root and
       run: netperf -H <HOST>

v0 [Kazuya Mizuguchi]
---
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
index dc1177c76aa5..5158ba3f9ce3 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
+++ b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
@@ -497,18 +497,7 @@
 	status = "okay";
 
 	phy0: ethernet-phy at 0 {
-		rxc-skew-ps = <900>;
-		rxdv-skew-ps = <0>;
-		rxd0-skew-ps = <0>;
-		rxd1-skew-ps = <0>;
-		rxd2-skew-ps = <0>;
-		rxd3-skew-ps = <0>;
-		txc-skew-ps = <900>;
-		txen-skew-ps = <0>;
-		txd0-skew-ps = <0>;
-		txd1-skew-ps = <0>;
-		txd2-skew-ps = <0>;
-		txd3-skew-ps = <0>;
+		rxc-skew-ps = <1500>;
 		reg = <0>;
 		interrupt-parent = <&gpio2>;
 		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
-- 
2.7.0.rc3.207.g0ac5344