Part Number:TMDXIDK5718
Tool/software: Linux
Hi
I'm using Linux SDK 5.1, custom HW, strongly based on IDK574.
I have EEPROM (chip address 0x51) on I2C bus 2 behind an pca9546 (chip address 0x70) on channel 1 (In IDK, EPROM and PMIC are both on I2C bus 0.)
I can successfully read eeprom in U-boot as follows:
Setting bus 2: i2c dev 2
setting channel 1 on mux: i2c mw 70 0.1 1
Read 400h bytes: i2c md 51 0.2 400
Now I tried to do same in do_board_detect() of SPL.
int save = i2c_get_bus_num(); // save the bus number because later in board_late_init() we have to talk to bus 0 again
gpi2c_init()
rc = i2c_set_bus_num(i2c_bus /* 2 */);
if (rc) return rc;
// set mux to channel 1
uint8_t buffer = 1; // channel 1
rc = i2c_write(0x70, 0, 0, &buffer, 1); // here I always get return code 1
if (rc) return rc;
rc = i2c_probe(0x51);
if (rc) return rc;
rc = i2c_read(0x51, 0x0, 0x2, (uint8_t *)ep, sizeof (struct my_eeprom));
if (rc) return rc;
i2c_set_bus_num(save); // restore bus number
So How I can I use bus number 0 in SPL? Do I have to add the mux and EEPROM in devicetree? I just enabled i2c2:
&i2c2 {
clock-frequency = <100000>;
u-boot,dm-spl;
status = "okay";
};
Or do I have to set CONFIG_SYS_OMAP24_I2C_SLAVE<n> or some other CONFIG_?
BR, Chris
