spi

Hi Bala,

The SPI0 interface on the StarterKit can be pinmuxed out of the J11 Zigbee header. Add this line (in bold) to the evm_sk_dev_cfg[] structure array inside <linux_folder>/arch/arm/mach-omap2/board-am335xevm.c:

/* EVM - Starter Kit */
static struct evm_dev_cfg evm_sk_dev_cfg[] = {
    {am335x_rtc_init, DEV_ON_BASEBOARD, PROFILE_ALL},
    {mmc1_wl12xx_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {mmc0_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {rgmii1_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {rgmii2_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {lcdc_init,     DEV_ON_BASEBOARD, PROFILE_ALL},
    {enable_ecap2,     DEV_ON_BASEBOARD, PROFILE_ALL},
    {mfd_tscadc_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {gpio_keys_init,  DEV_ON_BASEBOARD, PROFILE_ALL},
    {gpio_led_init,  DEV_ON_BASEBOARD, PROFILE_ALL},
    {lis331dlh_init, DEV_ON_BASEBOARD, PROFILE_ALL},
    {mcasp1_init,   DEV_ON_BASEBOARD, PROFILE_ALL},
    {uart1_wl12xx_init, DEV_ON_BASEBOARD, PROFILE_ALL},
    {wl12xx_init,       DEV_ON_BASEBOARD, PROFILE_ALL},
    {gpio_ddr_vtt_enb_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
    {sgx_init,       DEV_ON_BASEBOARD, PROFILE_ALL},
    {spi0_init,       DEV_ON_BASEBOARD, PROFILE_ALL},
    {NULL, 0, 0},
};

As for your second question, the Linux driver only supports master mode as stated here: http://processors.wiki.ti.com/index.php/AM335x_McSPI_Driver%27s_Guide

Best regards,
Miroslav

Hi Miroslav

I did the same, and got the new kernal image.but,

I am unable to see the SPI CLK signal in the Oscilloscope..(Pins i have connected to CRO is J11 Connector 4th and 5th pins)..My SPI Board slave information give like below..

static struct spi_board_info am335x_spi0_slave_info[] = {
{
.modalias = "spike",
.max_speed_hz = 24000000,
.bus_num = 1,
.chip_select = 0,
.mode = SPI_MODE_0,
},

Please suggest me..

Regards 

Bala

Hi Miroslav,

can you help me in the same issue.

regards,

Muthe.

Hi,

Can you both try the following to see if your pinmux configurations are correct:

On your target system:

mount -t debugfs none /sys/kernel/debug/
cd /sys/kernel/debug/omap_mux/
cat spi0_sclk
cat spi0_d0

The output from the "cat" commands should show in which mode are these pins pinmuxed.

Best regards,
Miroslav

Here is the output

cat spi0_sclk
name: spi0_sclk.spi0_sclk (0x44e10950/0x950 = 0x0020), b NA, t NA
mode: OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN
signals: spi0_sclk | uart2_rxd | i2c2_sda | NA | NA | NA | NA | gpio0_2

cat spi0_d0

name: spi0_d0.spi0_d0 (0x44e10954/0x954 = 0x0030), b NA, t NA
mode: OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP
signals: spi0_d0 | uart2_txd | i2c2_scl | NA | NA | NA | NA | gpio0_

Hi muthe..

I have also got the same output.

cat spi0_sclk 
name: spi0_sclk.spi0_sclk (0x44e10950/0x950 = 0x0020), b NA, t NA
mode: OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN
signals: spi0_sclk | uart2_rxd | i2c2_sda | NA | NA | NA | NA | gpio0_2

cat spi0_d0

name: spi0_d0.spi0_d0 (0x44e10954/0x954 = 0x0030), b NA, t NA
mode: OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP
signals: spi0_d0 | uart2_txd | i2c2_scl | NA | NA | NA | NA | gpio0_3

Regards

bala

hi ,

may be we are facing the same issue.  :)

regards,

Muthe