arm: dts: rockchip: disable "usb_host0_ohci" to make boot faster for Radxa ROCK 3A

on-board USB 2.0 hub, FE1.1s, has Transaction Translator which can
handle USB 1.x devices via "usb_host0_ehci". so we can omit
"usb_host0_ohci" and make boot faster (a little).

=> usb start
starting USB...
Bus usb@fd000000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
Bus usb@fd800000: USB EHCI 1.00
Bus usb@fd880000: USB EHCI 1.00
Bus usb@fd8c0000: USB OHCI 1.0
scanning bus usb@fd000000 for devices... 1 USB Device(s) found
scanning bus usb@fd800000 for devices... 2 USB Device(s) found
scanning bus usb@fd880000 for devices... 1 USB Device(s) found
scanning bus usb@fd8c0000 for devices... 3 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
=> usb tree
USB device tree:
  1  Hub (5 Gb/s, 0mA)
     U-Boot XHCI Host Controller

  1  Hub (480 Mb/s, 0mA)
  |  u-boot EHCI Host Controller
  |
  +-2  Hub (480 Mb/s, 100mA)
        USB 2.0 Hub

  1  Hub (480 Mb/s, 0mA)
     u-boot EHCI Host Controller

  1  Hub (12 Mb/s, 0mA)
  |   U-Boot Root Hub
  |
  +-2  Hub (12 Mb/s, 100mA)
    |  ALCOR Generic USB Hub
    |
    +-3  Mass Storage (12 Mb/s, 300mA)
         JetFlash Mass Storage Device 02K1RNH5MJFV4TX6

=> usb reset
resetting USB...
Host not halted after 16000 microseconds.
Bus usb@fd000000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
Bus usb@fd800000: USB EHCI 1.00
Bus usb@fd880000: USB EHCI 1.00
Bus usb@fd8c0000: USB OHCI 1.0
scanning bus usb@fd000000 for devices... 1 USB Device(s) found
scanning bus usb@fd800000 for devices... 4 USB Device(s) found
scanning bus usb@fd880000 for devices... 1 USB Device(s) found
scanning bus usb@fd8c0000 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
=> usb tree
USB device tree:
  1  Hub (5 Gb/s, 0mA)
     U-Boot XHCI Host Controller

  1  Hub (480 Mb/s, 0mA)
  |  u-boot EHCI Host Controller
  |
  +-2  Hub (480 Mb/s, 100mA)
    |   USB 2.0 Hub
    |
    +-3  Hub (12 Mb/s, 100mA)
      |  ALCOR Generic USB Hub
      |
      +-4  Mass Storage (12 Mb/s, 300mA)
           JetFlash Mass Storage Device 02K1RNH5MJFV4TX6

  1  Hub (480 Mb/s, 0mA)
     u-boot EHCI Host Controller

  1  Hub (12 Mb/s, 0mA)
      U-Boot Root Hub

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
index 9d18f5d0b364eff56522e829446a3e080d841166..9078b9a67a282b83cf78324ca6c681e8022f36a1 100644 (file)
--- a/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
+++ b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
@@ -40,3 +40,7 @@
                spi-tx-bus-width = <1>;
        };
 };
+
+&usb_host0_ohci {
+       status = "disabled";
+};