phy: rockchip-inno-combphy: support u3 to work on u2 only mode

This patch adds a kernel node "u3phy_mode" in sysfs to config
USB 2.0 only or USB 2.0/3.0 mode for combphy USB mode. This
method is only used for USB Host mode.

It needs to reinit the xHCI when switch between USB 2.0 only
and USB 2.0/3.0 mode dynamically. In order to reinit the xHCI,
we use the "otg_mode" node in sysfs to remove/add xHCI HCD.

<How to use>
1. Default is USB 3.0 OTG mode, config to USB 2.0 only mode
   echo u2 > /sys/devices/platform/<u3phy dev name>/u3phy_mode
   echo host > /sys/devices/platform/<u2phy dev name>/otg_mode

2. Default is USB 3.0 Host mode, config to USB 2.0 only mode
   echo otg > /sys/devices/platform/<u2phy dev name>/otg_mode
   echo u2 > /sys/devices/platform/<u3phy dev name>/u3phy_mode
   echo host > /sys/devices/platform/<u2phy dev name>/otg_mode

3. Default is USB 2.0 only Host mode, config to USB 3.0 mode
   echo otg > /sys/devices/platform/<u2phy dev name>/otg_mode
   echo u3 > /sys/devices/platform/<u3phy dev name>/u3phy_mode
   echo host > /sys/devices/platform/<u2phy dev name>/otg_mode

Change-Id: Ia7d00ba4718da0e04dae38a9a50eea8c464fbbad
Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>

0 files changed, 0 insertions, 0 deletions