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Pinmux - enabling SPI

Former Member

As the Black has a new 3.8.x generation kernel, omap_mux has gone and we're in the realms of using pinctrl for setting up the pins on the expansion headers.

 

Looking through the bonescript library it appears to try omap_mux and if that fails it just reverts to treating the pin as a gpio. That's all very well until you want to enable a PWM, UART, SPI etc.

 

So does anyone know what magic is needed on the black ?   I'm suffering here from plenty of information on enabling SPI on the original beaglebone with a 3.2.x kernel, but basically zero info on the current state for the Black.

 

/proc/config.gz says CONFIG_SPI_OMAP24XX=y and I've loaded spi-dev, still no /dev entries for spi and the pinmux settings look wrong.  I'm missing something or doing something wrong I'm sure, but right now it seems as if going through /dev/mem, behind pinctrl's back, might be the only way ?

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  • I have been playing with dtbo to enable spi0 on the BeagleBone Black. You can read about it on inbedded.net. Hope that will help,

     

    Christophe

  • in reply to Former Member

    Hi Christophe, and welcome to Element 14's BBB community!

     

    That's a  nice set of BBB articles at your site.  My discarded Nokia Communicator 9210 has been looking at me with some anxiety since I began reading your experiences interfacing the Nokia 3330's LCD. image  The  9210 is a completely different beast of course, but I'll take a look on the net for info on its nice colour LCD, as it might well have an SPI or I2C interface like yours.

     

    It's great to have more examples to help demystify Device Tree Overlays.  What's next on your BBB project plan?

     

    Morgaine.

     

    Addendum.  Scratch that for an idea, the 9210 schematics show that the display has a parallel interface driven by a bespoke chip.  Oh well, I'll find some other display to recycle, there's no shortage of old gear here.

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  • in reply to Former Member

    Hi Christophe, and welcome to Element 14's BBB community!

     

    That's a  nice set of BBB articles at your site.  My discarded Nokia Communicator 9210 has been looking at me with some anxiety since I began reading your experiences interfacing the Nokia 3330's LCD. image  The  9210 is a completely different beast of course, but I'll take a look on the net for info on its nice colour LCD, as it might well have an SPI or I2C interface like yours.

     

    It's great to have more examples to help demystify Device Tree Overlays.  What's next on your BBB project plan?

     

    Morgaine.

     

    Addendum.  Scratch that for an idea, the 9210 schematics show that the display has a parallel interface driven by a bespoke chip.  Oh well, I'll find some other display to recycle, there's no shortage of old gear here.

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