Driver data in u-boot

I am trying to write a spi bus driver for an arm board. Different boards from the same vendor
are likely to have more than one instance of the controller.
So I am attempting to write a portable driver for all instances on a board. However each board is going to have different config data like gpio numbers, clock freq plan etc. Can I maintain these as read only global data in board specific files
and declare them as externs in the driver implementation

I realize this is an implementation/design question,
but I believe there are some guidelines regarding use of global data in u-boot.
My understanding is that this approach conforms to those guidelines but correct me
if im wrong.

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