Bitbanged SPI over GPIO probe fail

Bitbanged SPI over GPIO probe fail

[Orjan Friberg]

Hi list,

I'm trying to use the bitbanged spi_gpio.c driver on a Beagleboard, 
using the inlined approach (defining gpio pin numbers and cs).

When modprobing the driver platform_driver_probe returns -ENODEV but 
spi_gpio_probe is not being called, which seems odd to me.  Any suggestions?

This is on a 2.6.32 TI PSP kernel.

There is in fact no device attached on the pins, but as the driver's 
probe function isn't called I don't think it should matter.  Also, I 
have checked that I can manually control the pins through /sys/class/gpio.

Thanks,
Orjan


-- 
Orjan Friberg
FlatFrog Laboratories AB

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Re: Bitbanged SPI over GPIO probe fail

[Orjan Friberg]

On 2010-08-09 17:35, Orjan Friberg wrote:
> When modprobing the driver platform_driver_probe returns -ENODEV but
> spi_gpio_probe is not being called, which seems odd to me.  Any suggestions?

This part I still don't understand, but I can at least insmod the driver 
by changing platform_driver_probe to platform_driver_register; it shows 
up in /sys/bus/platform/drivers now too.

(I get that I need to call platform_driver_register and create a sysfs 
entry etc before I have a device to play with.)

-- 
Orjan Friberg
FlatFrog Laboratories AB

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