dpi_dss_clk_calc
ok = dpi_dss_clk_calc(dpi, pck_req, &ctx);
if (!dpi_dss_clk_calc(dpi, *clock, &ctx))
ok = dpi_dss_clk_calc(pck_req, &ctx);
ok = dpi_dss_clk_calc(timings->pixelclock, &ctx);