Hi All, As the subject says this series is mostly about passing the ACPI fwnode to i2c-clients instantiated by the i2c-multi-instantiate code. As discussed here: https://bugzilla.kernel.org/show_bug.cgi?id=198671 BOSC0200 ACPI devices may sometimes describe 2 accelerometers in a single ACPI device, while working on this I noticed that BOSC0200 ACPI nodes contain ACCEL_MOUNT_MATRIX info (unlike all the other ACPI ids for bmc150 accelerometers). Which is why I wanted to pass the fwnode so that we could use this info in the bmc150-accel driver. The plan was to use i2c-multi-instantiate for this, but doing so will change the modalias and /lib/udev/hwdb.d/60-sensor.hwdb matches on the modalias for various quirks setting ACCEL_MOUNT_MATRIX. So then the plan became to first add support for the mount-matrix provided inside the BOSC0200 ACPI node, making the udev info unnecessary. But for at least 1 model (and probably more) the BOSC0200 ACPI node and hwdb info does not match and since the hwdb info is added by users of the actual devices we can assume it is correct, so it seems that we cannot always trust the ACPI provided info. This is ok, the hwdb info overrides it (iio-sensor-proxy prefers the udev provided mount-matrix over the one provided by the driver) but this means that we MUST keep the existing hwdb matches working, which means that we cannot use i2c-multi-instantiate for this. Instead I will dust of an old patch for this from Jeremy Cline: https://patchwork.kernel.org/project/linux-iio/patch/010001602cf53153-39ad69f1-1b39-4e6d-a748-9455a16c2fbd-000000@xxxxxxxxxxxxxxxxxxx/ Which deals with there being 2 accelerometers inside the bmc150-accel driver. But before coming to the conclusion that i2c-multi-instantiate would not work I had already written this series. Since this might be useful for some other case in the future I'm sending this out as a RFC now, mostly so that it gets added to the archives. Regards, Hans p.s. The 4th patch is not related to the fwnode passing, but was also necessary for the BOSC0200 case.
