Hi,
I am using the PCA9665 controller in my custom board because the
internal I2C controller of my processor (AT91RM9200) is not robust. The
following are my configs:
Hardware:
D0 - D7 --> D0 - D7
Write strobe --> NWR0/NWE/CFWE
Read strobe --> NRD/NOE/CFOE
Chip Enable --> NCS2
A0 --> A0/NBS0
A1 --> A1
Interrupt request --> PB29/IRQ0
Reset --> PB27
Software:
static struct resource i2c_resources[] = {
[0] = {
.start = AT91_CHIPSELECT_2, /* 0x30000000 */
.end = AT91_CHIPSELECT_2 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91RM9200_ID_IRQ0,
.end = AT91RM9200_ID_IRQ0,
.flags = IORESOURCE_IRQ,
},
};
static struct i2c_pca9564_pf_platform_data pca9665_platform_data = {
.gpio = AT91_PIN_PB27,
.i2c_clock_speed= 0,
.timeout = HZ, /* timeout in jiffies */
};
static struct platform_device pca9665_twi_device = {
.name = "i2c-pca-platform",
.id = -1,
.dev = {
.platform_data = &pca9665_platform_data,
},
.num_resources = ARRAY_SIZE(i2c_resources),
.resource = i2c_resources,
};
void __init at91_add_device_i2c(struct i2c_board_info *devices, int
nr_devices)
{
at91_set_A_periph(AT91_PIN_PB29, 1); /* IRQ0 interrupt pin */
i2c_register_board_info(0, devices, nr_devices);
platform_device_register(&pca9665_twi_device);
}
But the board detects the wrong external I2C controller (PCA9564):
# dmesg | grep PCA
PCA9564/PCA9665 at 0x30000000: PCA9564 detected.
PCA9564/PCA9665 at 0x30000000: Choosing the clock frequency based on
index is deprecated. Use the nominal frequency.
PCA9564/PCA9665 at 0x30000000: Clock frequency is 330kHz
PCA9564/PCA9665 at 0x30000000 registered.
And, the i2c controller is not functional at all. The i2cdetect command
of i2c-tools package from lm-sensors, does not detect any devices on my
i2c bus, while there must be two i2c devices (a RTC and a temperature
sensor) on my board. There is no i2c clock or data signal either on the
bus using the oscilloscope probe.
How can I fix this so the board detects the functional and correct
controller (PCA9665)?
Best regards,
Elyas Razzaghi
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