Re: [PATCH] reset: socfpga: use arch_initcall for early initialization

From: Pavel Machek
Date: Sun Oct 12 2014 - 10:30:44 EST


> From: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>
> There are certain drivers that are required to get loaded very early using
> arch_initcall. An example of such a driver is the SOCFPGA's FPGA bridge driver.
> This driver has to get loaded early because it needs to enable FPGA components
> that are connected to the bridge.
> This FPGA bridge driver will using the reset controller API to toggle it's
> reset bits, thus, it needs the reset driver to be loaded as early as possible
> in order for it to get used properly.
> Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>

> +static int __init socfpga_reset_init(void)
> +{
> + return platform_driver_probe(&socfpga_reset_driver,
> + socfpga_reset_probe);
> +}
> +
> +static void __exit socfpga_reset_exit(void)
> +{
> + platform_driver_unregister(&socfpga_reset_driver);
> +}
> +
> +arch_initcall(socfpga_reset_init);
> +module_exit(socfpga_reset_exit);

That is quite a strange combination. Driver can be module but needs to
be initialized early? Should we make it always built in?

> MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx");
> MODULE_DESCRIPTION("Socfpga Reset Controller Driver");

(cesky, pictures)
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