* [PATCH] ARM: dts: imx: b650v3: Calibrate USB PHY to pass eye diagram test
@ 2016-09-14 21:14 Jaret Cantu
2016-10-23 12:11 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Jaret Cantu @ 2016-09-14 21:14 UTC (permalink / raw)
To: linux-arm-kernel
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 <jaret.cantu@timesys.com>
---
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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2016-09-14 21:14 [PATCH] ARM: dts: imx: b650v3: Calibrate USB PHY to pass eye diagram test Jaret Cantu
2016-10-23 12:11 ` Shawn Guo
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