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Can McASP pins on DM8168 be muxed to GPIO?

_Ralph_
Guru 10685 points


In the datasheet I see that in the "muxed" column for information on the McASP pins, there is the word "PINCTRLxxxx".

Does this mean that the usage of the McASP pins can be changed? If so, how do I do that?

Thanks,
Ralph

  • 0
    Genius 3700 points

    Hi,

      Have you tried the debugfs module? I haven't used it for McASP but it could work:

    mount -t debugfs none /sys/kernel/debug
    cd /sys/kernel/debug/omap_mux
    grep -i mca * 

        then use cat or echo on the files to change the mode.

    -David

  • 0 in reply to David Soto - RidgeRun
    Guru 10685 points

    That is brilliant. Not sure why I didn't think of looking there before as I'm already using some other pins. For future reference here are the pins available:

    /sys/kernel/debug/omap_mux/mca2_axr1
    /sys/kernel/debug/omap_mux/mca2_axr0
    /sys/kernel/debug/omap_mux/mca2_amute
    /sys/kernel/debug/omap_mux/mca2_afsx
    /sys/kernel/debug/omap_mux/mca2_aclkhx
    /sys/kernel/debug/omap_mux/mca2_aclkx
    /sys/kernel/debug/omap_mux/mca2_afsr
    /sys/kernel/debug/omap_mux/mca2_ahclkr
    /sys/kernel/debug/omap_mux/mca2_aclkr
    /sys/kernel/debug/omap_mux/mca1_axr1
    /sys/kernel/debug/omap_mux/mca1_axr0
    /sys/kernel/debug/omap_mux/mca1_amute
    /sys/kernel/debug/omap_mux/mca1_afsx
    /sys/kernel/debug/omap_mux/mca1_aclkhx
    /sys/kernel/debug/omap_mux/mca1_aclkx
    /sys/kernel/debug/omap_mux/mca1_afsr
    /sys/kernel/debug/omap_mux/mca1_ahclkr
    /sys/kernel/debug/omap_mux/mca1_aclkr
    /sys/kernel/debug/omap_mux/mca0_axr5
    /sys/kernel/debug/omap_mux/mca0_axr4
    /sys/kernel/debug/omap_mux/mca0_axr3
    /sys/kernel/debug/omap_mux/mca0_axr2
    /sys/kernel/debug/omap_mux/mca0_axr1
    /sys/kernel/debug/omap_mux/mca0_axr0
    /sys/kernel/debug/omap_mux/mca0_amute
    /sys/kernel/debug/omap_mux/mca0_afsx
    /sys/kernel/debug/omap_mux/mca0_aclkhx
    /sys/kernel/debug/omap_mux/mca0_aclkx
    /sys/kernel/debug/omap_mux/mca0_afsr
    /sys/kernel/debug/omap_mux/mca0_ahclkr
    /sys/kernel/debug/omap_mux/mca0_aclkr