I need some help to find out why my rtc-ds1306 driver doesn't bind to the spi2.1 devices
I'm working on embedded linux (3.2.0) platform that I would like to use the spi to communicated with an RTC DS1306 and other spi devices. The platform come default with spi1.0 talk to a nor flash and I'm able to add and communicated with the spidev driver to the /dev/spi1.1 and /dev/spi2.0. The rtc-ds1305 driver is available under /sys/bus/spi/drivers/ (rtc-ds1306) but it's doesn't bind to any spi (ex:spi2.1). Spi1.1 and spi2.0 bind automatically. I don't see any error message at boot...
Can you tell me what is missing?
//---board-xxxx.c files----
static const struct flash_platform_data am335x_spi_flash = {
.type = "w25q64",
.name = "spi_flash",
};
/*
* SPI Flash works at 80Mhz however SPI Controller works at 48MHz.
* So setup Max speed to be less than that of Controller speed
*/
static struct spi_board_info am335x_spi0_slave_info[] = {
{
.modalias = "m25p80",
.platform_data = &am335x_spi_flash,
.irq = -1,
.max_speed_hz = 24000000,
.bus_num = 1,
.chip_select = 0,
},
//PH140107 add spidev driver for the spi0_cs1
{
.modalias = "spidev",
.max_speed_hz = 12000000,
.bus_num = 1,
.chip_select = 1,
.mode = SPI_MODE_0,
},
};
//PH140110 add this platform_data
static const struct ds1305_platform_data am335x_spi_rtc = {
.is_ds1306 = true,
.en_1hz = false,
};
/* PH140109
* SPI RTC DS1306 (use RTC-ds1305 driver) and add SPI1_CS0 incase need it for spi1_dsp
* So setup Max speed to be less than that of Controller speed
*/
static struct spi_board_info am335x_spi1_slave_info[] = {
{
.modalias = "rtc-ds1305",
.platform_data = &am335x_spi_rtc,
.max_speed_hz = 1000000,
.bus_num = 2,
.chip_select = 1,
.mode = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA,
},
{
.modalias = "spidev",
.max_speed_hz = 48000000,
.bus_num = 2,
.chip_select = 0,
.mode = SPI_MODE_0,
},
};
edit: I can't find the rtc in the /dev/rtcX but in the /sys/bus/spi/devices I can see spi1.0,spi1.1,spi2.0 and spi2.1. Additionnaly in the /sys/bus/spi/drivers I can find m25p80, rtc-ds1305 and spidev. If I go in /sys/bus/spi/drivers/spidev I can see spi1.1 and spi2.0 (+ bind,uevent and unbind) but if I go to /sys/bus/spi/drivers/rtc-ds1305 there just bind,uevent and unbind.
I think I should see /dev/rtc0 and in /sys/bus/spi/drivers/rtc-ds1305 I should see spi2.1
I was working on a development board so the ds1306 wasn't populated so can't answering to the rtc-ds1305 driver sanity check. When connected to the real-board it appear under /dev/rtc0.
Problem solve!