The Renesas RZ/G2L (and RZ/G2LC) USBHS controller requires the
CNEN bit in the SYSCFG register to be set for function operation.
Additionally, its CFIFO is byte-addressable.

Introduce a new renesas_usbhs_driver_param structure for the
RZ/G2L SoC and link it via the udevice_id data pointer. Update
usbhs_probe() to accept the udevice pointer to retrieve these
parameters during initialization.

This alignment follows the logic used in the Linux kernel
renesas_usbhs driver.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Michele Bisogno <micbis.openwrt@gmail.com>

Some Renesas SoCs, such as the RZ/G2L, require the USBHS core to
be explicitly deasserted from reset before register access is
possible.

Update the OTG probe to handle a bulk reset controller. To maintain
hardware stability, the reset is deasserted after clocks are
enabled in probe(), and asserted before clocks are disabled
in remove().

Update the error paths in probe to ensures clocks are disabled
if the reset initialization fails.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Michele Bisogno <micbis.openwrt@gmail.com>

The driver currently fails to unregister the USB gadget when the
device is removed or the driver is unbound. This leads to dangling
pointers in the UDC core and potential memory corruption.

Add a call to usb_del_gadget_udc() in the remove path to ensure
a clean teardown of the gadget interface.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Michele Bisogno <micbis.openwrt@gmail.com>

Add UDC driver for Renesas USBHS controller found in R-Car Gen3 SoCs.
This is mostly ported from the Linux kernel, with additional porting
glue. The code has been synchronized with 1b4861e32e46 ("Linux 6.9.3")
and cleaned up and ported to DM since the original implementation by
Vitaliy.

Signed-off-by: Vitaliy Vasylskyy <vitaliy.vasylskyy@globallogic.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20240908230654.286062-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>