[Gumstix-users] SPI Bus

[Aaron B. <aar...@gm...>]

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I am really having a hard time understanding what I'm supposed to be
doing to get a device working on the SPI bus with spidev.

I compiled the omap3-desktop-image and went to
~/overo-oe/tmp/work/overo-angstrom-linux-gnueabi/linux-omap"myvers"/git/
and ran make ARCH=arm menuconfig and added userspace spi(spidev) I then
copied the .config to
~/overo-oe/user.collection/packages/linux/linux-omap3/overo/defconfig.

Now I know that in order to get this to work I am supposed to add my
device along the lines of:
static  struct spi_board_info gumstix_spi_board_info = {
        .modalias = "spidev",
        .max_speed_hz = 2000000,
        .bus_num = 1,
        .chip_select = 0,
};

to a file so that it will show up under /dev. So I found a file
~/overo-oe/tmp/staging/overo-angstrom-linux-gnueabi/kernel/arch/arm/mach-omap2/board-overo.c
and in there the following is inside it:
static struct spi_board_info overo_spi_board_info[] __initdata = {
        {
                .modalias               = "ads7846",
                .bus_num                = 1,
                .chip_select            = 0,
                .max_speed_hz           = 1500000,
                .controller_data        = &ads7846_mcspi_config,
                .irq                    = OMAP_GPIO_IRQ(OVERO_GPIO_PENDOWN),
                .platform_data          = &ads7846_config,
        }
};

So If I remove this device and add mine (because I want to use
chip_select 0 for my device) will the change be reflected in the build
or will it get blown away when I compile. Also is there anything else I
need to do?

Any help would be awesome.
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