phy: usb-nop-xceiv: Add clock support ...

As stated in the FIXME comment this is needed. Get and
enable a "main_clk" just like the kernel does.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

phy: Add usb-nop-xceiv support ...

Add a nop usb transcveiver driver. At the moment it does nothing,
so is nothing more than a driver to satisfy the device tree
dependencies. clk / vbus-regulator / vbus-detect-gpio support can be
added later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

phy: Introduce to_usbphy conversion function ...

The generic phy support layer has the necessary list handling
and phy retrieval functions, so we should reuse them for usb
phys. This adds a phy_to_usbphy() conversion function which
drivers can implement which attach to the generic phy layer
and are really usb phys.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

phy: Introduce of_phy_get_by_phandle ...

Currently generic phy support assumes that the standard phy binding from
dts/Bindings/phy/phy-bindings.txt is used. This adds a helper function
which can be used to retrieve a phy when this standard binding is not
used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

add generic PHY framework ...

This brings in the generix PHY framework from Linux.
I tried to strip it down as much as possible while
keeping it useful.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>