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* [PATCH] arm64: dts: uniphier: stabilize ethernet of LD20 reference boar
@ 2018-04-27  4:25 Masahiro Yamada
  2018-04-27  4:27 ` Masahiro Yamada
  0 siblings, 1 reply; 2+ messages in thread
From: Masahiro Yamada @ 2018-04-27  4:25 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Masami Hiramatsu, Jassi Brar, Kunihiko Hayashi, Masahiro Yamada,
	devicetree, linux-kernel, Rob Herring, Will Deacon, Mark Rutland,
	Catalin Marinas

Currently, the ethernet RGMII mode on the LD20 reference board is
unstable.

The default drive-strength of ethernet TX pins is too strong because
there is no dumping resistor on the TX lines on the board.

Weaken the drive-strength to make the ethernet more stable.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

 arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts b/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
index 2c1a92f..440c2e6 100644
--- a/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
+++ b/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
@@ -67,3 +67,11 @@
 		reg = <0>;
 	};
 };
+
+&pinctrl_ether_rgmii {
+	tx {
+		pins = "RGMII_TXCLK", "RGMII_TXD0", "RGMII_TXD1",
+		       "RGMII_TXD2", "RGMII_TXD3", "RGMII_TXCTL";
+		drive-strength = <9>;
+	};
+};
-- 
2.7.4

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] arm64: dts: uniphier: stabilize ethernet of LD20 reference boar
  2018-04-27  4:25 [PATCH] arm64: dts: uniphier: stabilize ethernet of LD20 reference boar Masahiro Yamada
@ 2018-04-27  4:27 ` Masahiro Yamada
  0 siblings, 0 replies; 2+ messages in thread
From: Masahiro Yamada @ 2018-04-27  4:27 UTC (permalink / raw)
  To: Masahiro Yamada
  Cc: Masami Hiramatsu, Jassi Brar, Kunihiko Hayashi, DTML,
	Linux Kernel Mailing List, Rob Herring, Will Deacon,
	Mark Rutland, Catalin Marinas, linux-arm-kernel

2018-04-27 13:25 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
> Currently, the ethernet RGMII mode on the LD20 reference board is
> unstable.
>
> The default drive-strength of ethernet TX pins is too strong because
> there is no dumping resistor on the TX lines on the board.
>
> Weaken the drive-strength to make the ethernet more stable.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---


To myself:

Fix the typo in the subject

  boar  ->  board




-- 
Best Regards
Masahiro Yamada

^ permalink raw reply	[flat|nested] 2+ messages in thread

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