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Linux/PROCESSOR-SDK-AM57X: MPU frequency question

Part Number: PROCESSOR-SDK-AM57X

Tool/software: Linux

Hi Sir:

    We want to modify the Linux device tree to let AM572x CPU can run from 5000Mhz to 1.5Ghz, we have reference  below web-site :   http://processors.wiki.ti.com/index.php/Linux_Porting_Guide_for_AM571x/AM570x_Speed_Grades

    For original setting int the device tree are  three speed steps

u32 dra7_opp_dsp_clk_rates[NUM_OPPS][OPP_DSP_CLK_NUM] =

      {{}, /*OPP_LOW */

       {600000000, 600000000, 400000000}, /* OPP_NOM */

      {700000000, 700000000, 466666667}, /* OPP_OD */

      {750000000, 750000000, 500000000}, /* OPP_HIGH */ };

   How can we modify the relative files let Am572x can run form 500Mhz to 1.5Ghz?

Thanks.