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This is needed on Android devices using the Generic >Kernel Image (GKI), where SoC-specific drivers must be built as modules >rather than built into the core kernel image. > >For i.MX8Q devices running Android with a GKI kernel, the SCU power >domain driver must be loadable. Without tristate support, power domains >cannot be properly initialized, preventing these systems from >functioning under GKI. > >Use subsys_initcall() so that when built-in the power domain provider >probes before its consumers (e.g. the SCU clock driver at >device_initcall level), fixing "failed to attached the power domain" >warnings at boot. When built as a module, subsys_initcall() is >equivalent to module_init(). No module_exit() is provided because the >SCU power domain provider is a system-level resource that cannot be >safely removed at runtime. > >Add MODULE_DEVICE_TABLE() for OF-based module autoloading. > >Signed-off-by: Zhipeng Wang Reviewed-by: Peng Fan