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On some SoCs, like Qualcomm SoCs, the PSCI cluster power domain is used by system-wide firmware interfaces to make sure none of the CPUs are suspended before submitting requests. While on U-boot we only use the first core and we never suspend it, the Device Tree still references it and blocks those nodes to be probed. Simply bind the PSCI power-domain subnoded to a stub power domain driver in order to solve the runtime dependencies. Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>