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How to get the SPI character device node in 8127 IPNC RDK 3.0?

xue
Intellectual 260 points

Hi All,

      I work on 8127 IPNC RDK 3.0.

      And I want get the  the SPI character device node in filesystem like as ''/dev/spidevX.X".

     In the Kernel config menu, I enable the "SPI support" and the "User mode SPI device driver support " option.

    When the system startup, the kernel print the message "PM: Adding info for spi:spi1.0".

    And in /proc/devices, I find the ''153 spi".  

    All is looks right.

   But there is no “spidevX.X” in /dev.

   And I mknod manually like below, it return "spi0: No such device or address" when read or write.

          brw-r--r-- 1 root root 153, 0 Apr 2 01:20 spi0
          brw-r--r-- 1 root root 153, 1 Apr 2 01:21 spi1

  

 Could someone help me?  

Thanks!

    

  • 0
    Mastermind 8715 points

    Hi xue,

                 have u tried building SPI along with kernel or u tried building it as module? (i am referring to TI81XX_PSP_McSPI_Driver_Guide.pdf)

  • 0 in reply to Ravikiran HV
    Intellectual 260 points

    Hi Ravikiran,

          Thanks for you reply.

          I build SPI along with kernel.

         

          

    I want to read/write data dierctly by a SPI interface‘s device node,  Should I must modify the arch/arm/mach-omap2/board-ipnc.c?

    Thank you.

    Best Regards,

    Xue

  • 0 in reply to xue
    Mastermind 8715 points

    Hi xue,

                   I think board-ti8148ipnc.c need to be updated.

    May be some experts in the group ll answer your query.  M new to SPI.

  • 0 in reply to Ravikiran HV
    Intellectual 260 points

    Hi Ravikiran,

                  Thanks your help. The problem is resolved.

                  The spi device uses the  "spidev" driver,  then the the /dev/spidevX.X emerge.

                  Like blow in board-ti8148ipnc.c:

                           struct spi_board_info __initdata ti8148_spi_slave_info[] = {
                           {
                           .modalias = "spidev",
                           .irq = -1,
                           .max_speed_hz = 100000,
                           .bus_num = 1,
                           .chip_select = 0,
                           .mode = SPI_MODE_1,
                           },
                           };


    Best Regards,

    Xue