SPI is not accessible

[Yuefan]

Hi,

I am doing a project which needs one spi out and it will be connected
to a slave chip,. My board is pandaboard, and I compiled uboot and 3.2
linux kernel, now it is working. But the problem now is when I went to
the file of Boad_omap4panda.c under the folder arch/arm/mach-omap2,
and did the following changes, there is no /dev/spi things like that
meaning that I am not able to access it. Could someone help me ??
thanks



#include <plat/mcspi.h>
#include <linux/spi/spi.h>
static struct spi_board_info panda_spi_board_info[] __initdata = {
{
.modalias = "testtttt",
.bus_num = 1,
.chip_select = 0,
.max_speed_hz = 24000000,
.mode = SPI_MODE_1,
.irq = -1,

},
};

spi_register_board_info(panda_spi_board_info,
ARRAY_SIZE(panda_spi_board_info)); //this function is called
in the omap4_panda_init

[Yuefan]

Anyone can help me? thanks in advance !!

[Bharathi Subramanian]

> Anyone can help me? thanks in advance !!

It might be an pin mux related issue. Please search in this list
archives, there were few discussions related to SPI in past.

HTH :)
--
Bharathi Subramanian

[Yuefan]

Hi Bharathi

I searched it in the list archives and I followed what they told us to
do, and it didnt work at all, can you send me any instructions ?
thanks

On Apr 10, 1:11 pm, Bharathi Subramanian <bharathi.l...@gmail.com>
wrote:

[Bharathi Subramanian]

Hi,

If you can put down your modifications in sequence and current issue,
it may help to give proper suggestion.

Bye :)
--
Bharathi Subramanian

[Yuefan]

Hi,
I did the following things:

1. I compiled 2012.04 uboot without any change, then I got uImage and
MLO

2. I downloaded kernel 3.2.13 and modified the board_omap4panda.c

I included two more libs

#include <linux/spi/spi.h>
#include <plat/mcspi.h>


then in order to get the device in the file system, I added these code


static struct omap2_mcspi_device_config spidev_mcspi_config = {
.turbo_mode = 0,
.single_channel = 1, /* 0: slave, 1: master */
};

static struct spi_board_info panda_spi_board_info[] __initdata = {
{

.modalias = "spidev",

.bus_num = 1,
.chip_select = 0,

.max_speed_hz = 1000,
.mode = SPI_MODE_0,
.controller_data = &spidev_mcspi_config,
},
};

static int __init omap4_panda_spi_init(void){
spi_register_board_info(panda_spi_board_info,
ARRAY_SIZE(panda_spi_board_info));

omap_mux_init_signal("mcspi1_clk.mcspi1_clk", OMAP_PIN_INPUT
| OMAP_MUX_MODE0);
omap_mux_init_signal("mcspi1_somi.mcspi1_somi", OMAP_PIN_INPUT |
OMAP_MUX_MODE0);
omap_mux_init_signal("mcspi1_simo.mcspi1_simo", OMAP_PIN_OUTPUT
| OMAP_MUX_MODE0);
omap_mux_init_signal("mcspi1_cs0.mcspi1_cs0",
OMAP_PIN_OUTPUT| OMAP_MUX_MODE0);

return 0;
}


finally, I call the inital function in the
static void __init omap4_panda_init(void){


omap4_panda_spi_init();

}

I am using angstrom minimal file system.

Thanks



On Apr 11, 9:18 am, Bharathi Subramanian <bharathi.l...@gmail.com>
wrote:

[Yuefan]

can someone help me!?

[Yuefan]

Please help me

[Yuefan]

Hi all,

I check the debug mode, and from the console I saw chipselect0 is
already in use, not able to create /dev/spidev,

can someone know whats happening and how to solve it?

[aaron...@gmail.com]

take a look at this http://www.omappedia.com/wiki/PandaBoard_SPI