I have SPI device connect to J13 pin { EIM_D21(cspi sclk), EIM_D22(cspi MISO), EIM_D28(cspi MOSI), EIM_D29(cspi SS0) }.
When i use my driver send SPI data, i can't get the pulse on the clk PIN.
My driver create a character device use "spi_write_then_read()" function send data, the return value is 0.
I set cspi on mx53_loco.c
static struct mxc_spi_master mxcspi1_data = {
.maxchipselect = 4,
.spi_version = 23,
};
static struct spi_board_info touch_device[] __initdata = {
{
.modalias = "sis_spi",
.max_speed_hz = 25000000, /* max spi clock (SCK) speed in HZ */
.bus_num = 1,
.chip_select = 1,
.platform_data = &mxc_spi_flash_data[0],},
};
static void __init mxc_board_init(void)
{
...
mxc_register_device(&mxcspi1_device, &mxcspi1_data);
spi_register_board_info(touch_device, ARRAY_SIZE(touch_device));
}
devices.c
static struct resource mxcspi1_resources[] = {
{
.start = CSPI1_BASE_ADDR,
.end = CSPI1_BASE_ADDR + SZ_4K - 1,
.flags = IORESOURCE_MEM,
},
{
.start = MXC_INT_CSPI1,
.end = MXC_INT_CSPI1,
.flags = IORESOURCE_IRQ,
},
{
.start = MXC_DMA_CSPI1_TX,
.end = MXC_DMA_CSPI1_TX,
.flags = IORESOURCE_DMA,
},
};
static u64 spi_dma_mask = DMA_BIT_MASK(32);
struct platform_device mxcspi1_device = {
.name = "mxc_spi",
.id = 0,
.num_resources = ARRAY_SIZE(mxcspi1_resources),
.resource = mxcspi1_resources,
.dev = {
.dma_mask = &spi_dma_mask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
};
If i didn't set IOMUX in mx53_loco_pads[] struct, cspi clk keep HIGH.
if i set "MX53_PAD_EIM_D21__CSPI_SCLK, MX53_PAD_EIM_D22__CSPI_MISO, MX53_PAD_EIM_D28__CSPI_MOSI, MX53_PAD_EIM_D29__CSPI_SS0" in mx53_loco_pads[], cspi clk keep LOW.
I check my driver, it probe success. So i can "echo" to device.When use "spi_write_then_read()" function it call "mxc_spi_transfer()"(mxc_spi.c) and return 0, but can't get pulse on the clk PIN.
How can i do for work?
