The mcp23s08 drivers was moved from gpio to pinctrl "subsystem" in linux-4.13.

As linux-4.9 is still used for some targets, how to proceed with this mcp23s08 driver? Create a new (second) CONFIG option (kmod-pinctrl-mcp23s08) coexisting to the kmod-gpio-mcp23s08?

Or is it possible to get this handled by the existing CONFIG option and depend on the kernel version?
Any hints are welcome.

- Martin


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