Can't add spi to /dev

[moranmoran]

Hi all,

I'm working on IMX6SL EVK board running : 

kernel 3.10.53

devicetree : imx6sl-evk-pl

I'm trying but w/o success to add SPI to my /dev folder ( in order to use it in my app with IOCTL ).

I've already turn "on" the CONFIG_SPI_SPIDEV=y in the .config file.

I've read that i need also to add spidev to spi_board_info struct but i can't find in my kernel tree the relevant file.

Please advise,

Thanks in advance,

Moran.

[moranmoran]

Also :

I'm not sure if i need the "spi_board_info" because i'm using device tree.

I've already add the SPIDEV to the device tree but it still doesn't help.

from device tree :

&ecspi1 {

               fsl,spi-num-chipselects = <1>;

               cs-gpios = <&gpio4 11 0>;

               pinctrl-names = "default";

               pinctrl-0 = <&pinctrl_ecspi1_1>;

               status = "okay";

               spidev@0 {

                                 #address-cells = <1>;

                                 #size-cells = <1>;

                                 comatible = "spidev";

                                 spi-max-frequency = <20000000>;

                                 reg = <0>;

                 };

};

[Carlos_Musich]

Hi moranmoran,

last week I had exactly the same issue with imx6q. Using dmesg | grep spi I found that the SPI pins were being configured multiple times in the device tree, so I needed to remove other configurations and rebuild device tree.

Besides this, for some strange reason I had to rebuild the kernel, I dont know if I did something wrong in the first builld. I enabled SPIDEV using make menuconfig.

Regards,
Carlos

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[moranmoran]

Hi Carlos

1) Dmesg - SPI print : 

      root@plsdk-armel:~# dmesg | grep spi
      [ 0.921356] spi_imx 2008000.ecspi: probed

2) I've already select SPIDEV in .config

Really don't know where is the problem.

Moran.

[Carlos_Musich]

Hi Moran,

If you are you executing make imx_v7_defconfig after you make the changes then the .config file is overwritten

Please follow next sequence:

make distclean

make imx_v7_defconfig

make menuconfig  (in this step set SPIdev under Device Drivers -> SPI and save configuration)

make zImage

And finally replace the zImage file that you are using for the newly generated.

Regards,

Carlos