Hi Jean,
Jean Delvare wrote:
Hi Wolfgang,
On Fri, 11 Jul 2008 14:40:58 +0200, Wolfgang Grandegger wrote:
Jean Delvare wrote:
There's no "detection" involved for the new-style i2c devices.
Presumably you are still using the old binding model, not taking
benefit of the patch at all. Use i2c_register_board_info() to
instantiate your "ds75" i2c device from you board's platform code, and
it should work.
I have some general question on I2C device probing. Our board does have
two I2C buses. On the first on, there is an RTC at addr 0x32 and a DS75
at 0x4c. Both are defined in the Flattened Device Tree and therefore
i2c_register_board_info() will be called for them. On the second bus,
there are other I2C devices. Nevertheless, probing for RTC and DS75 at
addr 0x32 and 0x4c will be performed also on that bus. Is this the
normal/intended behavior? Can such probing be suppressed?
Probing isn't supposed to happen at all for RTC chips. There are a few
drivers which remain to be converted though (rtc-ds1672, rtc-max6900,
rtc-pcf8583.) If you use one of these and would like to help converting
it, please tell me (and Alessandro Zummo.)
OK. We ported an old RTC driver for the Epson RX8025 for our board.
Unfortunately, it did not use the new bindings but I fixed that in the
meantime. It will be posted for kernel inclusion soon.
For hwmon chips, probing only occurs if the i2c adapter accepts to be
probed, by setting the I2C_CLASS_HWMON flag in i2c_adapter.class. If
you do not want a given i2c bus to be probed, then do not set the flag
for that bus.
I see. My problem is that I2C_CLASS_HWMON is set in the I2C bus driver
for the MPC:
http://lxr.linux.no/linux+v2.6.26/drivers/i2c/busses/i2c-mpc.c#L314
If I disable it, the LM75 driver only probes the addresses of the I2C
nodes defined in the FDT DTS file. I wonder if this should not be the
default behaviour for kernels using OF platform description. For this
reason, I have put Linuxppc-dev ML on CC. I also realized, that there
are some patches for OF I2C pending. I will check.
Wolfgang.
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