dsi_pll_get_params
ret = dsi_pll_get_params(dsi, pll_in_khz, req->rate / 1000,
ret = dsi_pll_get_params(dsi, pll_in_khz, rate / 1000, &idf, &ndiv, &odf);
ret = dsi_pll_get_params(dsi, pll_in_khz, pll_out_khz, &idf, &ndiv, &odf);