clk: rockchip: rk3588: Add REF_CLK_USB3OTGx support

The REF_CLK_USB3OTGx clocks is used as reference clock for USB3 block.

Add simple support to get rate of REF_CLK_USB3OTGx clocks to fix
reference clock period configuration.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Acked-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
1 file changed