Hi, Rodolfo
I've tried your patches with linux-2.6.27 kernel running
on custom board with 460EX PowerPC. This board has
two i2c buses and pca9548 switch on bus 0.
The 954x driver (compiled into the kernel) creates 8
virtual buses just fine. However devices behind the
mux are not detected if I use the "recommended" way
of doing things.
I have RTC (ds1338) and temp sensor (ds1625) on mux
channel 4 (i.e virtual bus 6). What I did initially to add
the following code to board init code:
struct board_i2c_info {
int bus;
int addr;
char *id;
};
static struct board_i2c_info board_i2c_devices[] = {
/* Bus Addr ID */
{6, 0x68, "ds1338"},
{6, 0x49, "ds1625"},
};
static int board_i2c_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(board_i2c_devices); i++) {
struct i2c_board_info info = {};
info.irq = -1;
info.addr = board_i2c_devices[i].addr;
if (strlcpy(info.type, board_i2c_devices[i].id,
I2C_NAME_SIZE) >= I2C_NAME_SIZE)
return -ENOMEM;
i2c_register_board_info(board_i2c_devices[i].bus, &info, 1);
}
}
arch_initcall(board_i2c_init);
This code is invoked by kernel before i2c bus and mux detection,
but, as I said, RTC and sensor are not identified.
If I invoke the following code after creation of virtual
adapters, things start working, but I don't like this solution
static int board_i2c_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(board_i2c_devices); i++) {
struct i2c_board_info info = {};
struct i2c_adapter *adap;
info.irq = -1;
info.addr = board_i2c_devices[i].addr;
if (strlcpy(info.type, board_i2c_devices[i].id,
I2C_NAME_SIZE) >= I2C_NAME_SIZE)
return -ENOMEM;
adap = i2c_get_adapter(board_i2c_devices[i].bus);
i2c_new_device(adap, &info);
}
}
My question is: how can I register board i2c devices behind
the mux in board init code, and make them properly identified
when relevant drivers are loaded.
Thanks a lot.
Felix.
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