i.MX ProcessorsのトピックRe: how open spidev on imx28 platform?

how open spidev on imx28 platform?

yongkimin — Mon, 09 Dec 2013 08:39:14 GMT

Hi I developing on imx28 platform. I'm using ltib version is L2.6.35_10.12.01.

I did my effort to open spidev I did study on this community. But in my case not opened.

I did

I modify the name to spidev my code mx28evk.c in /arch/arm/mach-mx28 directory
static struct spi_board_info spi_board_info[] __initdata = {
#if defined(CONFIG_MTD_M25P80) || defined(CONFIG_MTD_M25P80_MODULE)
{
/* the modalias must be the same as spi device driver name */
.modalias = "spidev", /* Name of spi_driver for this device */
.max_speed_hz = 20000000, /* max spi clock (SCK) speed in HZ */
.bus_num = 1, /* Framework bus number */
.chip_select = 0, /* Framework chip select. */
.platform_data = &mx28_spi_flash_data,
},
#endif
};
configuration of spi is
./config/platform/imx/imx28evk_defconfig.dev:1053:CONFIG_SPI_SPIDEV=m
in terminal of my device
root@freescale /module_test$ cat /sys/bus/spi/devices/spi1.0/modalias
spidev
my application try open "/dev/spidev1.0"
error return is can't open spidev device,(-1),(No such file or directory)

Who can tell me how open it?

Re: how open spidev on imx28 platform?

yongkimin — Thu, 12 Dec 2013 02:36:44 GMT

I solved it I hope this help to others.

check the configuration (I recommend it should be y not m)
SPI support – CONFIG_SPI=y

Freescale MXS SPI controller – CONFIG_SPI_MXS=y

User mode SPI device driver support – CONFIG_SPI_SPIDEV=y

check also the configuration in /rpm/BUILD/linux/arch/arm/config/
change the spi_board_info in mx28evk.c
static struct spi_board_info spi_devboard_info[] __initdata = {

#if defined(CONFIG_SPI_MXS) || defined(CONFIG_SPI_MXS_MODULE)

{

/* the modalias must be the same as spi device driver name */

.modalias = "spidev", /* Name of spi_driver for this device */

.max_speed_hz = 20000000, /* max spi clock (SCK) speed in HZ */

.bus_num = 1, /* Framework bus number */

.chip_select = 0, /* Framework chip select. */

.mode = SPI_MODE_0,

#endif

};

static void spi_device_init(void)

{

#if 0

spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));

#else

spi_register_board_info(spi_devboard_info, ARRAY_SIZE(spi_devboard_info));

printk(KERN_INFO "register (spi_devboard_info) \n");

#endif

after update uImage rebuilt check if spidev_init log you add it.

after update of uImage I can see the /dev/spidev1.0

Thanks.

Re: how open spidev on imx28 platform?

tongchunyang — Mon, 10 Feb 2014 05:12:13 GMT

Hi Min

Thanks for your helpful information about this desicussion.

Now I have the same problem with imx28.

And I have found the /dev/spidev1.0 by your work.

Now there is no spi device on the imx28, so I think test spidev by using mxc_spi_test.out could failed.

----------------------------------

root@freescale /unit_tests$ ./mxc_spi_test1.out -D 0 -s 1000000 -b 8 E6E0

Execute data transfer test: 0 4 E6E0

spi mode: 0

bits per word: 8

max speed: 1000000 Hz (1000 KHz)

Failed transferring data: 22

-----------------------------------

Re: how open spidev on imx28 platform?

yongkimin — Mon, 10 Feb 2014 06:07:12 GMT

Dear Tong,

I don't know "mxc_spi_test1.out" pls understand me. I did test with spidev_test.c in /document/spi directory.

You can understand that. My application use that and works is good. If your HW is have no problem then you get good result.

Thanks.

Re: how open spidev on imx28 platform?

tongchunyang — Mon, 10 Feb 2014 06:12:11 GMT

Hi Min

Thanks a lot.

I am confirming my problem now. Need to connect another device to test I think...

Thank you again:smileyhappy:

Re: how open spidev on imx28 platform?

monicachiosa — Thu, 14 Aug 2014 14:23:59 GMT

Hey Min,

I have tried the same as you did, but without successful.

I have the same configuration in kernelconfig file, but in the file from linux/arch/arm/config/ CONFIG_SPI_MXS=m. I don`t know if this is the issue or not.

Have you installed some special patches for spidev for imx28.

I am using TQMA28 module and I want to enable and to use the SSP2. The module has on it imx287.

Thanks,

Monica

Re: how open spidev on imx28 platform?

shashikanthirem — Mon, 16 Mar 2020 08:47:17 GMT

hello suppose if you have two SPI

SSP1_SS0

SSP2_SS1

SSP2_SS3

how you will create three spidev1.0 , spidev2.1, and spidev2.3

Only one am able to create

Re: how open spidev on imx28 platform?

shashikanthirem — Sat, 21 Mar 2020 18:01:35 GMT

yes now I got the spidev1.0,2.0

but unable to pass the spidev test function , unable to transfer:invalid argument

I am using 2.6.35.3 kernel linux

any patch?/ solution

Re: how open spidev on imx28 platform?

shashikanthirem — Sun, 22 Mar 2020 23:35:10 GMT

I got the spidev1.0,2.0

but unable to pass the spidev test function , unable to transfer:invalid argument -22

I am using 2.6.35.3 kernel linux

Can you tell me where to debug