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Tegra20's GPIO controller has 7 banks, and Tegra30's controller has 8 banks. Allow the number of banks to be configured at run-time by the device tree. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Olof Johansson <olof@lixom.net>