TEGRA_MUX_FUNCTION_MASK
reg &= ~(TEGRA_MUX_FUNCTION_MASK << TEGRA_MUX_FUNCTION_SHIFT);
reg |= (tmp & TEGRA_MUX_FUNCTION_MASK) <<
reg &= ~(TEGRA_MUX_FUNCTION_MASK << TEGRA_MUX_FUNCTION_SHIFT);
reg |= (tmp & TEGRA_MUX_FUNCTION_MASK) <<