• Martin Blumenstingl's avatar
    phy: amlogic: add USB3 PHY support for Meson GXL and GXM · 115de9fd
    Martin Blumenstingl authored
    This adds a new driver for the USB3 PHY found on Meson GXL and GXM SoCs
    (both SoCs are using the same USB PHY register layout).
    
    Unfortunately there is no documentation for this PHY in the public S905X
    datasheet (published for example by Khadas). What we know so far about
    this PHY:
    - even though the Meson GXL and GXM SoCs do not expose an USB3 port (the
      dwc3 controller only has USB2 ports enabled) we need to initialize the
      USB3 PHY (specifically USB_R1_U3H_FLADJ_30MHZ_REG_MASK). Without this
      initialization high-speed USB devices (especially USB hard disks and
      thumb drives, slower devices like mice do not seem to be affected)
    - on some boards the USB3 PHY starts in "device mode" - we want to bring
      it into a known state (by switching it to host mode for now).
    - it is responsible for the OTG detection and for switching the first
      USB2 PHY between host and peripheral (aka device) mode. an interrupt
      can be used to detect changes between host and device mode.
    
    There are five inputs to this register area:
    - the clock and reset line for the USB3 PHY itself
    - the clock and reset line for the peripheral mode and OTG detection
      logic (on the GXL and GXM SoCs these are the same clock and reset line
      as for the USB3 PHY itself, but Amlogic sees this as two different
      components - even though they share the same register space - so they
      have to be passed individually to allow specifying different inputs on
      other SoCs if needed)
    - the interrupt for the OTG detection logic
    
    The whole OTG detection logic is not implemented yet.
    Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
    Tested-by: default avatarYixun Lan <yixun.lan@amlogic.com>
    Tested-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
    Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
    115de9fd
Makefile 168 Bytes