Not able to create /dev/spidev0.0

[Sivanantham M]

Hi All ,

          i have insmod the spidev.ko, but not able to see the /dev/spidev0.0. how i can get the spidev node ??

Thanks

Sivanantham M

[Praveen Singh]

you need to do mknode /dev/spidev0.0

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[Sivanantham M]

In procfs i can see the module, but devnode is not created

root@OpenWrt:/# cat /proc/modules  | grep spid
spidev 4656 0 - Live 0x861fe000
root@OpenWrt:/#

[Sivanantham M]

Hi Praveen,

            But I have enabled the spi in raspberry pi , i can able to see /dev/spidev0.0 without doing mknode. How i can do that automatically ??

[Sivanantham M]

Is there any way to mention which pins (CLK,MISO,MOSI,CS )  the /dev/spidev should use for data communication ???

[Pradeep Tewani]

It seems you are missing the corresponding changes in the DTB. Just check if the SPI1 is enabled and under that you have a spidev node?

Regards,

Pradeep

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From: inside...@googlegroups.com <inside...@googlegroups.com> on behalf of Sivanantham M <siva.f...@gmail.com>
Sent: Tuesday, February 14, 2017 11:24 AM
To: inside...@googlegroups.com
Subject: Re: Not able to create /dev/spidev0.0

 

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[Thaju]

Check your DTB. Add spi entry something like below. Please change Chip Select/pinmuxing as per your SoC

This entry is for iMX6 prosessor.

&ecspi1 {
    fsl,spi-num-chipselects = <1>;
    cs-gpios =  <&gpio4 10 0>;     /* Chip Select - CS */
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_ecspi1>;
    status = "okay";

    spi_header: spidev1@0 {       
        compatible = "rohm,dh2228fv";
        spi-max-frequency = <20000000>;
        reg = <0>; /* CS0 */
    };
};

 
pinctrl_ecspi1: ecspi1grp {
            fsl,pins = <
                MX6QDL_PAD_KEY_COL1__ECSPI1_MISO    0x100b1
                MX6QDL_PAD_KEY_ROW0__ECSPI1_MOSI    0x100b1
                MX6QDL_PAD_KEY_COL0__ECSPI1_SCLK    0x100b1     
                MX6QDL_PAD_KEY_COL2__GPIO4_IO10     0x1b0b0 /* SPI Chip Select */
        };

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[Sivanantham M]

Thanks  ppl..

                i have added entry for spidev for device tree.

                 spidev@1 {
               compatible = "linux,spidev";
               spi-max-frequency = <10000000>;
               reg = <1>; 
           }; 
         

           Dev node is created .

           root@OpenWrt:/# ls /dev/spidev32766.1
           /dev/spidev32766.1
           root@OpenWrt:/#