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Document compatible string for Exynos7870 DWC3-compatible USB 2.0 driver. The devicetree node requires three clocks, named "bus_early", "ref", and "ctrl". Unlike other variants, Exynos7870's USB controller requires a single 3.0V regulator. Assert that the other 1.0V regulator requirement is enforced on variants individually other than Exynos7870's. Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250301-exynos7870-usb-v3-1-f01697165d19@disroot.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>