topic Re: Can't add spi to /dev in i.MX Processors

Can't add spi to /dev

moranmoran — Mon, 07 Aug 2017 14:18:19 GMT

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.

Re: Can't add spi to /dev

moranmoran — Tue, 08 Aug 2017 08:42:51 GMT

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>;

};

Re: Can't add spi to /dev

Carlos_Musich — Thu, 10 Aug 2017 16:39:05 GMT

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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Re: Can't add spi to /dev

moranmoran — Sun, 13 Aug 2017 06:52:27 GMT

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.

Re: Can't add spi to /dev

Carlos_Musich — Tue, 15 Aug 2017 22:41:06 GMT

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