target/linux/rockchip/patches-5.10/104-rockchip-use-USB-host-by-default-on-rk3399-rock-pi-4.patch

   1 From e12f67fe83446432ef16704c22ec23bd1dbcd094 Mon Sep 17 00:00:00 2001
   2 From: Vicente Bergas <vicencb@gmail.com>
   3 Date: Tue, 1 Dec 2020 16:41:32 +0100
   4 Subject: arm64: dts: rockchip: use USB host by default on rk3399-rock-pi-4
   5
   6 Based on the board schematics at
   7 https://dl.radxa.com/rockpi4/docs/hw/rockpi4/rockpi_4c_v12_sch_20200620.pdf
   8 on page 19 there is an USB Type-A receptacle being used as an USB-OTG port.
   9
  10 But the Type-A connector is not valid for OTG operation, for this reason
  11 there is a switch to select host or device role.
  12 This is non-compliant and error prone because switching is manual.
  13 So, use host mode as it corresponds for a Type-A receptacle.
  14
  15 Signed-off-by: Vicente Bergas <vicencb@gmail.com>
  16 Link: https://lore.kernel.org/r/20201201154132.1286-4-vicencb@gmail.com
  17 Signed-off-by: Heiko Stuebner <heiko@sntech.de>
  18 ---
  19  arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dts | 2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
  23 +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
  24 @@ -679,7 +679,7 @@
  25
  26  &usbdrd_dwc3_0 {
  27         status = "okay";
  28 -       dr_mode = "otg";
  29 +       dr_mode = "host";
  30  };
  31
  32  &usbdrd3_1 {