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[FAQ] AM6548: Under linux, how to configure the device tree to enable the DPI display interface output of the am6548 chip

shenghui.james
Prodigy 180 points
Part Number: AM6548

I downloaded the latest sdk of the am65xx series, but I don’t know how to configure the dss driver to enable the DPI display interface output of the am6548 chip.

  • 0
    Prodigy 180 points

    Hi,

    Do you have any updates?

    Regards,

    James

  • 0 in reply to shenghui.james
    TI__Guru** 113810 points

    Sorry about the delay in responding to this, we will provide you with an example shortly.

  • 0 in reply to Karthik Ramanan
    TI__Mastermind 23125 points

    Hi James, 

    To enable DPI, the easiest is to reuse most of the dts setting in the HDMI overlay file:

       <sdk_dir>board-support/linux-5.4.106+gitAUTOINC+023faefa70-g023faefa70/arch/arm64/boot/dts/ti/k3-am654-evm-hdmi.dtso

    it sets up correct pinmux, clocking and DSS ports. You can modify this file for your hardware as needed, and rebuild the overlay dtb. 

    The stock sdk already have the compiled overlay binary, where you can do: 

        During u-boot load: Hit any key to stop autoboot:  0

        => setenv name_overlays k3-am654-evm-hdmi.dtbo     

        => boot


    Unfortunately, the HDMI daughter card is not available for the the AM65 EVM, therefore you will not able to test the software on the EVM. But you can check corresponding registers on DSS and related clock path to ensure all hardware settings are done correctly with the dtb. 

    let  me know if you need any help. 

    regards

    Jian