WB_INDEX_CLK
wb_idx_write(wb, WB_INDEX_CLK, wb->wb_sdmmc_clk);
if (wb_idx_read(wb, WB_INDEX_CLK) != clk)
wb_idx_write(wb, WB_INDEX_CLK, clk);
if (wb_idx_read(wb, WB_INDEX_CLK) != wb->wb_sdmmc_clk)
wb_idx_write(wb, WB_INDEX_CLK, wb->wb_sdmmc_clk);