I am guessing here.... But what do you have while executing the
following command being in /sys
as root?
root@arm:/sys# find . -name spi*
Zee
_______
On Wed, Mar 17, 2021 at 5:41 PM jchludzinski via
lists.yoctoproject.org
<jchludzinski=vivaldi....@lists.yoctoproject.org> wrote:
>
> In the YOCTO/Linux source tree there's drivers/spi/ which has all the source
> for SPI drivers. There's only 1 file, spidev.c, which has:
>
> static int __init spidev_init(void)
> {
> int status;
>
> /* Claim our 256 reserved device numbers. Then register a class
> * that will key udev/mdev to add/remove /dev nodes. Last, register
> * the driver which manages those device numbers.
> */
> BUILD_BUG_ON(N_SPI_MINORS > 256);
> status = register_chrdev(SPIDEV_MAJOR, "spi", &spidev_fops);
> if (status < 0)
> return status;
>
> spidev_class = class_create(THIS_MODULE, "spidev");
> if (IS_ERR(spidev_class)) {
> unregister_chrdev(SPIDEV_MAJOR,
> spidev_spi_driver.driver.name);
> return PTR_ERR(spidev_class);
> }
>
> status = spi_register_driver(&spidev_spi_driver);
> if (status < 0) {
> class_destroy(spidev_class);
> unregister_chrdev(SPIDEV_MAJOR,
> spidev_spi_driver.driver.name);
> }
> return status;
> }
> module_init(spidev_init);
>
> ... for creating device files in udev.
>
> So when I use 'make nconfig' to specifiy that I want a loadable module for
> the ALTERA SPI driver, why don't I see a spidev.o file in drivers/spi/ ?
>
> How does spi-altera.ko create device files without a call to
> register_chrdev(...).
>
> How is it a loadable module without module_init(...)?
>
> When I separately build spidev.c as an .ko and try loading it, I get: "Device
> or resourse busy"
>
> ---John
>
>
>
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