From: Chen-Yu Tsai wens@csie.org
If the VBUS regulator is always-on, XHCI will fail to detect USB 3.0 devices; USB 2.0 devices will work however.
Make the VBUS regulator controllable and tie it to only the XHCI. This makes all three USB ports usable.
Signed-off-by: Chen-Yu Tsai wens@csie.org --- Changes since v2: - new patch --- arch/arm/dts/rk3328-rock64-u-boot.dtsi | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/arm/dts/rk3328-rock64-u-boot.dtsi b/arch/arm/dts/rk3328-rock64-u-boot.dtsi index e5946d2d2dc7..8318bf4e6030 100644 --- a/arch/arm/dts/rk3328-rock64-u-boot.dtsi +++ b/arch/arm/dts/rk3328-rock64-u-boot.dtsi @@ -12,5 +12,16 @@ };
&usb_host0_xhci { + vbus-supply = <&vcc_host_5v>; status = "okay"; }; + +/* + * This makes XHCI responsible for toggling VBUS. This is needed to work + * around an issue where either XHCI only works with USB 2.0 or OTG doesn't + * work, depending on how VBUS is configured. Having USB 3.0 seems better. + */ +&vcc_host_5v { + /delete-property/ regulator-always-on; + /delete-property/ regulator-boot-on; +};