pandaboard es spi devicetree

[bdav...@gmail.com]

Problem: missing spi devices in /dev directory

I am using the RobertCNelson scripts to build my PandaBoard-ES ubuntu( kernel 3.12.6 ) system and need to implement a custom spi device driver.  

The spidev character devices never show up in the /dev directory.  the /sys directory shows all 4 mcspi entries which indicates to me that I have a devicetree problem.

I have googled this and only seem to find references to the now deprecated board-* init files. 

Any help is appreciated.

Cheers,

Benjamin

[benjamin davis]

I got it. I Just added a device tree entry for the explicit CS on the mcspi of interest and it works. I thought I would see a mcspi entry like I do the i2c controllers.

[ma...@geiman.org]

Is there any chance you could give more detail as to where and how you added a device tree entry?  I need to do this exact same thing.

Thanks,

-Matt

[benjamin davis]

I will try to get to this tomorrow.  Sorry for the delay.

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[benjamin davis]

I added this to my omap4-panda-es.dts

&mcspi4

{

    spidev@0

    {

        compatible = "spidev";

        spi-max-frequency=<4000000>;

        reg = <0>;

    };

};

This extends the device tree node that is defined in omap4.dtsi

You must make sure that the spidev is enabled in your kernel config

You should then have an accessible device /dev/spidev4.0

If you intend to use mcspi1 you can access each of the chip-selects by replicating this code 4 times and changing the "reg" value for each respectively.

Cheers and I hope this helps,

Benjamin

[tanvi...@gmail.com]

can u give me detail information about board