[DM3730]请教关于DM3730中GPMC总线时钟FCLK频率更改问题

linux/arch/arm/mach-omap2/Clock34xx.c

下面为该文档中我修改的函数，红色部分为我修改的地方。

int __init omap2_clk_set_freq(void)
{
    struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck;
    struct clk *dpll2_ck, *iva2_ck, *dpll3_m2_ck;
    unsigned long osc_sys_rate;
    unsigned long dsprate, l3rate;
    short err = 0 ;
    int l3div;

    /*
     * Check if any processing is required.
     */
    if ((vdd1_opp == 0) && (vdd2_opp == 0))
        return 0;

    if (WARN((vdd1_opp == 0), "VDD1 OPP is not set.\n"))
        err = 1;

    if (WARN((vdd2_opp == 0), "VDD2 OPP is not set.\n"))
        err = 1;

    /*
     * Attempt to get the required clocks
     */
    dpll1_ck = clk_get(NULL, "dpll1_ck");
    if (WARN(IS_ERR(dpll1_ck), "Failed to get dpll1_ck.\n"))
        err = 1;

    arm_fck = clk_get(NULL, "arm_fck");
    if (WARN(IS_ERR(arm_fck), "Failed to get arm_fck.\n"))
        err = 1;

    core_ck = clk_get(NULL, "core_ck");
    if (WARN(IS_ERR(core_ck), "Failed to get core_ck.\n"))
        err = 1;

    osc_sys_ck = clk_get(NULL, "osc_sys_ck");
    if (WARN(IS_ERR(osc_sys_ck), "Failed to get osc_sys_ck.\n"))
        err = 1;

    dpll2_ck = clk_get(NULL, "dpll2_ck");
    if (WARN(IS_ERR("dpll2_ck"), "Failed to get dpll2_ck.\n"))
        err = 1;

    iva2_ck = clk_get(NULL, "iva2_ck");
    if (WARN(IS_ERR("iva2_ck"), "Failed to get iva2_ck.\n"))
        err = 1;

    dpll3_m2_ck = clk_get(NULL, "dpll3_m2_ck");
    if (WARN(IS_ERR("dpll3_m2_ck"), "Failed to get dpll3_m2_ck.\n"))
        err = 1;

    if (err)
        return -ENOENT;

    /*
     * Set MPU frequency
     */
    mpurate = mpu_opps [vdd1_opp].rate;
    if (clk_set_rate(dpll1_ck, mpurate))
        pr_err("Unable to set MPU frequency (%u)\n", mpurate);

    /*
     * Set DSP frequency
     */
    if (omap3_has_iva()) {
        omap2_clk_iva_init_to_idle();

        dsprate = dsp_opps [vdd1_opp].rate;
        if (clk_set_rate(dpll2_ck, dsprate))
            pr_err("Unable to set DSP frequency (%lu)\n", dsprate);
    }

    /*
     * Set L3 frequency
     */
    l3div  = cm_read_mod_reg(CORE_MOD, CM_CLKSEL) &
            OMAP3430_CLKSEL_L3_MASK;

    l3rate = l3_opps[vdd2_opp].rate * l3div;

    if (clk_set_rate(dpll3_m2_ck, l3rate))
        pr_err("Unable to set L3 frequency (%lu)\n", l3rate);

    /*
     * Re-calculate the clocks
     */
    recalculate_root_clocks();

    osc_sys_rate = clk_get_rate(osc_sys_ck);

    pr_info("Switched to new clocking rate (Crystal/Core/MPU): "
        "%ld.%01ld/%ld/%ld MHz\n",
        (osc_sys_rate / 1000000),
        ((osc_sys_rate / 100000) % 10),
        (clk_get_rate(core_ck) / 1000000),
        (clk_get_rate(arm_fck) / 1000000));

    if (omap3_has_iva()) {
        pr_info("IVA2 clocking rate: %ld MHz\n",
               (clk_get_rate(iva2_ck) / 1000000)) ;
    }

    calibrate_delay();

    return 0;
}