在 2017年12月28日星期四 CST 下午8:52:22，Hauke Mehrtens 写道：
> The RTL8152B USB controller needs a 3.3 volt power supply which is
> controlled by PAD20. Without this patch Linux will not see that there is
> a device connected to the USB bus and the 2. USB port will not work.
>
> I do not of a better solution to add a regulator to a USB device.
I have one.
Please check the patch I will send you soon.
>
> Signed-off-by: Hauke Mehrtens <ha...@hauke-m.de>
> ---
> arch/arm/boot/dts/sun8i-h2-plus-orangepi-r1.dts | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-r1.dts
> b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-r1.dts index
> 32a6d312422e..1d5db0e0bd12 100644
> --- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-r1.dts
> +++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-r1.dts
> @@ -47,13 +47,15 @@
> model = "Xunlong Orange Pi R1";
> compatible = "xunlong,orangepi-r1", "allwinner,sun8i-h2-plus";
>
> - /delete-node/ reg_vcc_wifi;
> -
> aliases {
> ethernet1 = &rtl8189etv;
> };
> };
>
> +®_vcc_wifi {
> + regulator-always-on;
> +};
> +
> &ohci1 {
> /*
> * RTL8152B USB-Ethernet adapter is connected to USB1,
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