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Support hardware versioning, which is now required for Tegra20 EMC OPP. Clean up OPP table initialization by using a error code returned by OPP API for judging about the OPP table presence in a device-tree and remove OPP regulator initialization because we're now going to use power domain instead of a raw regulator. This puts Tegra20 EMC OPP preparation on par with the Tegra30/124 EMC drivers. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20201203192439.16177-3-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>