linux-kernel - [PATCH 2/4] arm64: zynqmp: Revert usb node drive strength and slew rate for zcu106

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Message-ID: <85a70cb014ec1f07972fccb60b875596eeaa6b5c.1756799774.git.michal.simek@amd.com>
Date: Tue, 2 Sep 2025 09:56:19 +0200
From: Michal Simek <michal.simek@....com>
To: <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, <git@...inx.com>
CC: Radhey Shyam Pandey <radhey.shyam.pandey@....com>, Conor Dooley
	<conor+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring
	<robh@...nel.org>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE
 BINDINGS" <devicetree@...r.kernel.org>, "moderated list:ARM/ZYNQ
 ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 2/4] arm64: zynqmp: Revert usb node drive strength and slew rate for zcu106

From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>

On a few zcu106 boards USB devices (Dell MS116 USB Optical Mouse, Dell USB
Entry Keyboard) are not enumerated on linux boot due to commit
'b8745e7eb488 ("arm64: zynqmp: Fix usb node drive strength and slew
rate")'.

To fix it as a workaround revert to working version and then investigate
at board level why drive strength from 12mA to 4mA and slew from fast to
slow is not working.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp-zcu106-revA.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu106-revA.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu106-revA.dts
index cd132abf6e00..7f6c87d4d77e 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-zcu106-revA.dts
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu106-revA.dts
@@ -808,8 +808,8 @@ conf-tx {
 			pins = "MIO54", "MIO56", "MIO57", "MIO58", "MIO59",
 			       "MIO60", "MIO61", "MIO62", "MIO63";
 			bias-disable;
-			drive-strength = <4>;
-			slew-rate = <SLEW_RATE_SLOW>;
+			drive-strength = <12>;
+			slew-rate = <SLEW_RATE_FAST>;
 		};
 	};
 
-- 
2.43.0