dt-bindings: PCI: rockchip: Add vpcie12v-supply for Rockchip PCIe controller
The PCIe connector provide a optional 12V power supply for high power downstream components, so we add this as an optional one if we need to control it. Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Acked-by: NRob Herring <robh@kernel.org>
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