[PATCH] arm: dts: rockchip: rk3399-roc-pc: Enable FE1.1 USB 2.0 HUB on roc-rk3399-pc

[sunil at amarulasolutions.com]

From: Suniel Mahesh <sunil at amarulasolutions.com>

roc-rk3399-pc has an FE1.1 USB 2.0 HUB which connects two USB ports
(HOST1 and HOST2). For end devices to work we need to enable USB hub
so that HOST detects there presence and enumerates them accordingly.
This requires explicit pinctrl within gpio enablement.

Signed-off-by: Suniel Mahesh <sunil at amarulasolutions.com>
---
Note:
1. tested this on roc-rk3399-pc board version roc-rk3399-pc-v1.1-a 2018-9-25
2. after this changeset, HOST1 works but HOST2 still doesnt work. I have
tested them with linux-next, linux-rockchip and Firefly's source (both u-boot
and kernel), HOST2 doesn't work.
3. Request to test this changetest who have access to target and please advice
on HOST2
---
 arch/arm/dts/rk3399-roc-pc-u-boot.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
index 5746442..598e0e2 100644
--- a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
@@ -14,6 +14,16 @@
 	chosen {
 		u-boot,spl-boot-order = "same-as-spl", &sdhci, &sdmmc;
 	};
+
+	vcc_hub_en: vcc_hub_en-regulator {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio2 RK_PA4 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&hub_rst>;
+		regulator-name = "vcc_hub_en";
+		regulator-always-on;
+	};
 };
 
 &vdd_log {
-- 
2.7.4