From: Jaret Cantu <jaret.cantu@timesys.com>
To: shawnguo@kernel.org, kernel@pengutronix.de,
fabio.estevam@nxp.com, robh+dt@kernel.org, mark.rutland@arm.com,
linux@armlinux.org.uk, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: imx: b650v3: Calibrate USB PHY to pass eye diagram test
Date: Wed, 14 Sep 2016 17:14:49 -0400 [thread overview]
Message-ID: <1473887689-10792-1-git-send-email-jaret.cantu@timesys.com> (raw)
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
next reply other threads:[~2016-09-14 21:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-14 21:14 Jaret Cantu [this message]
[not found] ` <1473887689-10792-1-git-send-email-jaret.cantu-jEh4hwF5bVhBDgjK7y7TUQ@public.gmane.org>
2016-10-23 12:11 ` [PATCH] ARM: dts: imx: b650v3: Calibrate USB PHY to pass eye diagram test Shawn Guo
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