tegra20: add clock_set_pllout function
Common practice on Tegra 2 boards is to use the pllp_out4 FO to generate the ULPI reference clock. For this to work we have to override the default hardware generated output divider. This function adds a clean way to do so. Signed-off-by: NLucas Stach <dev@lynxeye.de> Signed-off-by: NTom Warren <twarren@nvidia.com>
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