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Clocks: disable unused mmcsd1 on DM365

Michael16400
Intellectual 515 points


Hello,

I would like to use MMC1/SD1 on my DaVinci DM365 circuit but it seems that when the Linux is booting, the corresponding clock for MMC1 is disabled.

What can I do to activate it and activate all the MMC/SD1 module?

Thanks,

Mike

  • 0
    Intellectual 670 points

    Hi Mike,

        Either you can call the clk_enable(&mmc_sd1_clk) from the function arch/arm/mach-davinci/dm365.c or you can use the devmem2 utility and enable the MMC/SD1 LPSC as given below.

    devmem2  0x01C41a1c w 0x3  // Enable the LPSC for MMC/SD1 module

    devmem2  0x01C41120 w 0x1  // GO command for the above to take effect

    Now you should be able to access the MMC/SD1 module registers.

    Regards,

    N.sugumar

  • 0 in reply to Sugumar Natarajan
    Intellectual 515 points

    Hello,

    Thanks for the hint.

    Actually, I modified the function "dm365_leopard_init" in "arch/arm/mach-davinci/board-dm365-(evm|leopard).c" and it did work too. It seems it activates the clock and MMC1 and it is more high-level.

    I juste wrote the following:

    davinci_setup_mmc(0, &dm365leopard_mmc_config); // That was already there (MMC0)
    davinci_setup_mmc(1, &dm365leopard_mmc_config); // I have added this one for MMC1

    Mike