iMX53QSB cspi spidev configuration

dani_g — Thu, 29 Aug 2013 15:27:37 GMT

I am working on a project that uses the imx53qsb (LOCO) board.

I have been trying to configure the cspi port for using the spidev without any success.

I set already the kernel configuration:

Spi support --> Freescale MXC CSPI controller.

--> User Mode SPI device driver support.

And register the mxc spi driver in:

mx53_loco.c

static iomux_v3_cfg_t mx53_loco_pads[] = {

/* CSPI */

MX53_PAD_DISP0_DAT0__CSPI_SCLK,

MX53_PAD_DISP0_DAT1__CSPI_MOSI,

MX53_PAD_DISP0_DAT2__CSPI_MISO,

MX53_PAD_DISP0_DAT3__CSPI_SS0,

MX53_PAD_DISP0_DAT4__CSPI_SS1,

MX53_PAD_DISP0_DAT5__CSPI_SS2,

MX53_PAD_DISP0_DAT6__CSPI_SS3,

...

}

static struct mxc_spi_master mxcspi3_data = {

.maxchipselect = 4,

.spi_version = 23,

};

static struct spi_board_info mxspi3_device[] __initdata = {

{

.modalias = "spidev",

.max_speed_hz =10000000,

.bus_num = 3,

.chip_select = 0,

.mode = SPI_MODE_1,

{

.modalias = "spidev",

.max_speed_hz =10000000,

.bus_num = 3,

.chip_select = 1,

.mode = SPI_MODE_1,

{

.modalias = "spidev",

.max_speed_hz = 10000000,

.bus_num = 3,

.chip_select = 2,

.mode = SPI_MODE_1,

{

.modalias = "spidev",

.max_speed_hz = 10000000,

.bus_num = 3,

.chip_select = 3,

.mode = SPI_MODE_1,

};

static void __init mxc_board_init(void)

{

...

mxc_register_device(&mxcspi3_device, &mxcspi3_data);

spi_register_board_info(mxspi3_device, ARRAY_SIZE(mxspi3_device));

...

}

I am working with the yocto project using the meta-fsl-arm layer and the version of kernel used is 2.6.35.

I get the spidev registered in the /dev folder but I don't see any output when I run the spi_test.c included in the Linux Documentation for testing the spidev.

Any idea where the problem is?

Thanks.

Re: iMX53QSB cspi spidev configuration

ivanbornyakov — Thu, 05 Jun 2014 13:14:46 GMT

Hi, Daniel!

Did you solve this?

I did similar setup, except .spi_version = 7, and /dev/spidev3.{0,1,2,3} shows up

But I can't get anything but "FF" from these devices

btw, with mainline kernel and cspi configured in imx53-qsb.dts I can get valid data, but I need cspi in 2.6.35 because of lack gpu drivers in mainline kernel

topic iMX53QSB cspi spidev configuration in i.MX Processors

iMX53QSB cspi spidev configuration

Re: iMX53QSB cspi spidev configuration