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[PATCH] ARM: dts: imx: b650v3: Calibrate USB PHY to pass eye diagram test

From: Jaret Cantu <hidden>
Date: 2016-09-14 21:14:49
Also in: linux-arm-kernel
Subsystem: the rest · Maintainer: Linus Torvalds

Calibrate the USB PHY TX settings to pass the eye diagram signal
integrity test.  The settings are taken from the i.MX6 reference
manual's recommended configuration for USB certification (66.2.6).

Signed-off-by: Jaret Cantu <redacted>
---
 arch/arm/boot/dts/imx6q-b650v3.dts |    6 ++++++
 1 file changed, 6 insertions(+)
diff --git a/arch/arm/boot/dts/imx6q-b650v3.dts b/arch/arm/boot/dts/imx6q-b650v3.dts
index 33cb71a..c266bd2 100644
--- a/arch/arm/boot/dts/imx6q-b650v3.dts
+++ b/arch/arm/boot/dts/imx6q-b650v3.dts
@@ -89,3 +89,9 @@
 		};
 	};
 };
+
+&usbphy1 {
+	fsl,tx-cal-45-dn-ohms = <55>;
+	fsl,tx-cal-45-dp-ohms = <55>;
+	fsl,tx-d-cal = <100>;
+};
-- 
1.7.10.4
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