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TMDSIDK574: MMC configuration

user6229465
Prodigy 40 points

Hello.

I want to set the MMC as follows.

48MHz / High Speed / 3.3V fixed

Modified file
/board-support/linux-4.19.38+gitAUTOINC+4dae378bbe-g4dae378bbe/arch/arm/boot/dts/am574x-idk.dtb

Are there other files to change?
  • 0
    TI__Guru**** 393215 points
    Hi,
    You query has been assigned to a TI engineer. Please note that response may be delayed due to Christmas and New Year holidays.
  • 0
    TI__Guru 70612 points

    Hi,

    yes in theory you can do all changes you need for this in arch/arm/dts/am574x-idk.dts. However you have to keep in mind that everything amended there via &mmc1 and &mmc2 etc. is essentially getting overlaid on all other DTS files that get included directly and indirectly by am574x-idk.dts. I would recommend after building your DTB to reverse-compile it using the Device Tree Compiler (dtc) so you can verify the effective result is what you want. You can do that for example using the below command. You can alter properties by overwriting them in am574x-idk.dts through a simple re-definition, and remove properties by doing '/delete-property/' in that top-level DTS file.

    $ dtc -I dtb arch/arm/boot/dts/am574x-idk.dtb | grep -A 30 'mmc@'

    Regards, Andreas