Cyril Brulebois <cyril@xxxxxxxxxxx> (2022-01-02):
> In passing, I'm seeing the RTC exclusively on (userspace) i2c-2 while
> I'm seeing the LED matrix on both (userspace) i2c-2 and i2c-3: […]
After a few more tests/reboots, checking the output of `i2cdetect -l`
gives the appropriate information, so that one can pick the right i2c-N
device, by looking at the *-mux entries and their channel IDs:
…
i2c-2 i2c bcm2835 (i2c@7e205000) I2C adapter
…
i2c-4 i2c i2c-2-mux (chan_id 0) I2C adapter
i2c-5 i2c i2c-2-mux (chan_id 1) I2C adapter
And indeed, those channel IDs match what's been defined in the DTB, with
#0 set to i2c0_gpio0 (e.g. LED matrix on 40-pin header) and #1 set to
i2c0_gpio44 (e.g. RTC, fan control, etc.), which seem quite consistent
this time:
- `i2cdetect -y 4` reports only 74 (the LED matrix);
- `i2cdetect -y 5` reports 0c, 2f, and 51 as UU (the RTC).
Cheers,
--
Cyril Brulebois -- Debian Consultant @ DEBAMAX -- https://debamax.com/
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