CLK_BUS
qcom_iommu->clks[CLK_BUS].clk = clk;
clk_disable(fimc->clock[CLK_BUS]);
clk_disable(fimc->clock[CLK_BUS]);
ret = clk_set_rate(fimc->clock[CLK_BUS], lclk_freq);
ret = clk_enable(fimc->clock[CLK_BUS]);