From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bin Meng <bmeng.cn@gmail.com>
Date: Sun, 12 Jun 2016 16:43:23 +0800
Subject: [U-Boot] MinnowMax GPIO for USB3
Message-ID: <CAEUhbmVJzDYMjx8yA122QB8va2UYxL7AR2ED3w0Z32Y3Ktc=wg@mail.gmail.com>
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To: u-boot@lists.denx.de

Hi,

My testing shows that only pin_usb_host_en1 is needed to turn on the
power on the USB3 port. The USB2 port power is turned on by default.

Removing the pin_usb_host_en0 from device tree will make both USB2 and
USB3 port work.

diff --git a/arch/x86/dts/minnowmax.dts b/arch/x86/dts/minnowmax.dts
index 1a8a8cc..63f751f 100644
--- a/arch/x86/dts/minnowmax.dts
+++ b/arch/x86/dts/minnowmax.dts
@@ -58,14 +58,6 @@
                        direction = <PIN_OUTPUT>;
                };

-               pin_usb_host_en0 at 0 {
-                       gpio-offset = <0x80 8>;
-                       pad-offset = <0x260>;
-                       mode-gpio;
-                       output-value = <1>;
-                       direction = <PIN_OUTPUT>;
-               };
-
                pin_usb_host_en1 at 0 {
                        gpio-offset = <0x80 9>;
                        pad-offset = <0x250>;

If we want to keep the pin_usb_host_en0 configuration in the device
tree, then the bug mentioned in [1] will cause the USB3 port does not
work. Only the USB2 port works.

[1] http://lists.denx.de/pipermail/u-boot/2015-October/229469.html

Regards,
Bin