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How to activate SPI in zedboard

ashahsana

Hello
I am using 7z020 board and I want to receive data from SPI
but the problem is in the /dev folder there is no SPIDEV file .
I did the following steps
In the XPS I design all the hardware , In this particular project I took a simplest case  in which I only add SPI and connected it with EMIO.

This is my constraint file

NET "processing_system7_0_SPI0_MOSI_O_pin" LOC = R19;
NET "processing_system7_0_SPI0_SCLK_I_pin" LOC = D18;
NET "processing_system7_0_SPI0_SS_O_pin" LOC = L21;

NET "processing_system7_0_SPI0_MOSI_O_pin" IOSTANDARD = LVCMOS25;
NET "processing_system7_0_SPI0_SCLK_I_pin" IOSTANDARD = LVCMOS25;
NET "processing_system7_0_SPI0_SS_O_pin" IOSTANDARD = LVCMOS25;

After this step I generate the .bit file and then I made boot file.

after booting the board  problem starts when I didn't find SPIDEV file  in the /dev folder . for this purpose I made devicetree for this particular project using SDK.
and add the following lines
spidev@0{
tcompatible="spidev";
treg =<0>; //chipselect 0
tspi-max-frequency= <50000000>;
t};


and then convert it into .dtb file because it was in .dts.

then rebuild the kernal

when i am using these files the done LED is on but on serial terminal is blank. Blue LEd means my FPGA is programmed and I can see clock means hardware connection is done.

Now where  i am doing mistake can anyone guide me please
May be i am doing mistake here

1. When I rebuild the kernal I put devicetree.dts in the ./ar,/arch/boot/dts folder and .dtb in the ./arch/arm/boot . is it ok???
2.I didn't make my u-boot for this particular program

Can you give me ANY Suggestions
thanks
Sana

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  • 0

    Hi Sana,

    Is this for a 7z020 ZedBoard or is it for 7z020 MicroZed, a 7z020 PicoZed target?

    If your serial terminal is blank after creating an entirely new devicetree, I would recommend starting with a known good devicetree and adding the SPI entries to that.

    There is some information for adding SPI support on this wiki page:

    http://www.wiki.xilinx.com/SPI+Zynq+driver

    Make sure you have the top level device entry for the SPI controller added to the devicetree.  If you are using SPI0 you would add the "spi: spi@e0006000" entry.

    Also take a look at this forum entry to make sure that the driver is being built into the kernel correctly.

    https://forums.xilinx.com/t5/Embedded-Linux/Spidev-issue-Spi-transfer-timeout/td-p/548153/page/2

    Regards,

    -Kevin

  • 0 in reply to zedhed

    Thanks Kevin for reply

    I am using 7z020 zedboard and
    As you suggested some links I already visited that and I am agree that the easiest way to enable SPIDEV is by editing the xilinx_zynq_defconfig file.

    I already enabled SPIDEV in xilinix_zynq_defconfig (and not use menuconfig command)

    CONFIG_SPI=y
    CONFIG_SPI_DEBUG=y
    CONFIG_SPI_MASTER=y
    CONFIG_SPI_SPIDEV=y

    then as you suggested i took the devicetree.dtb which is working and convert back to .dts . Then add the following commands in the devicetree.dts

    spi:spi@e0007000 {
    tttcompatible = "xlnx,ps7-spi-1.00.a";
    tttreg = <0xe0007000 0x1000>;
    tttxlnx,has-ss0 = <0x1>;
    tttxlnx,has-ss1 = <0x0>;
    tttxlnx,has-ss2 = <0x0>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tttdevice@0{
    ttttcompatible = "spidev";
    tttt#address-cells = <1>;
                 ttt#size-cells = <0>;
    ttttreg = <0x0>;
    ttttspi-max-frequency = <500000>;
    ttt};

    after that convert back to .dtb and then recompile the kernal.

    when I am using this kernal and this .dtb then the result is same means blank screen on serial terminal.

    so I used only this devicetree but not zImage then it works and boot properly although i cannot see /dev/spidev.
    this means some problem is in my kernal.

    For kernal, the git repository is
    git://git.xilinx.com/linux-xlnx.git

    but when I run this repository 

    Initialized empty Git repository in /home/training/linux-xlnx/linux-xlnx/.git/
    git.xilinx.com[0: 206.17.92.81]: errno=Connection refused
    fatal: unable to connect a socket (Connection refused)

    So I download this repository from the following link
    git://github.com/Xilinx/linux-xlnx

    Is it the problem?? and why I cannot download from  git://git.xilinx.com/linux-xlnx.git link
    thanks
    Sana



Reply
  • 0 in reply to zedhed

    Thanks Kevin for reply

    I am using 7z020 zedboard and
    As you suggested some links I already visited that and I am agree that the easiest way to enable SPIDEV is by editing the xilinx_zynq_defconfig file.

    I already enabled SPIDEV in xilinix_zynq_defconfig (and not use menuconfig command)

    CONFIG_SPI=y
    CONFIG_SPI_DEBUG=y
    CONFIG_SPI_MASTER=y
    CONFIG_SPI_SPIDEV=y

    then as you suggested i took the devicetree.dtb which is working and convert back to .dts . Then add the following commands in the devicetree.dts

    spi:spi@e0007000 {
    tttcompatible = "xlnx,ps7-spi-1.00.a";
    tttreg = <0xe0007000 0x1000>;
    tttxlnx,has-ss0 = <0x1>;
    tttxlnx,has-ss1 = <0x0>;
    tttxlnx,has-ss2 = <0x0>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tttdevice@0{
    ttttcompatible = "spidev";
    tttt#address-cells = <1>;
                 ttt#size-cells = <0>;
    ttttreg = <0x0>;
    ttttspi-max-frequency = <500000>;
    ttt};

    after that convert back to .dtb and then recompile the kernal.

    when I am using this kernal and this .dtb then the result is same means blank screen on serial terminal.

    so I used only this devicetree but not zImage then it works and boot properly although i cannot see /dev/spidev.
    this means some problem is in my kernal.

    For kernal, the git repository is
    git://git.xilinx.com/linux-xlnx.git

    but when I run this repository 

    Initialized empty Git repository in /home/training/linux-xlnx/linux-xlnx/.git/
    git.xilinx.com[0: 206.17.92.81]: errno=Connection refused
    fatal: unable to connect a socket (Connection refused)

    So I download this repository from the following link
    git://github.com/Xilinx/linux-xlnx

    Is it the problem?? and why I cannot download from  git://git.xilinx.com/linux-xlnx.git link
    thanks
    Sana



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