PCI: imx: Add multi-pd support
On some chips the PCIe and PCIE_PHY blocks are in separate power domains which can be power-gated independently. The PCI driver needs to handle this by keeping both domain active. This is intended for imx6sx where PCIe is in DISPLAY and PCIE_PHY in its own domain. Defining the DISPLAY domain requires a way for PCIe to keep it active or it will break when displays are off. The power-domains on imx6sx are meant to look like this: power-domains = <&pd_disp>, <&pd_pci>; power-domain-names = "pcie", "pcie_phy"; Signed-off-by: NLeonard Crestez <leonard.crestez@nxp.com> [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: NUlf Hansson <ulf.hansson@linaro.org>
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