Messages in this thread | | | From | Andy Shevchenko <> | Date | Mon, 25 Sep 2023 15:28:15 +0300 | Subject | Re: [PATCH 2/3] iio: imu: mpu6050: add level shifter flag |
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On Mon, Sep 25, 2023 at 3:04 PM Andreas Kemnade <andreas@kemnade.info> wrote: > On Mon, 25 Sep 2023 14:07:58 +0300 > Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > > On Mon, Sep 25, 2023 at 1:26 AM Andreas Kemnade <andreas@kemnade.info> wrote: > > > > > > Some boards fail in magnetometer probe if flag is not set. > > > > Which flag? Can you elaborate a bit more? > > > well see $subj. The level shifter flag.
Well. it is better to have the commit message being self-contained.
> > Does it deserve the Fixes tag? > > > As there are only certain boards affected, they would also have > to add the flag in dtb, I do not think it deservers a Fixes tag. > Even in the board I have here, there are basically two > mpu9150 connected per cable, only one of them needs the flag.
OK.
...
> > > unsigned int val; > > > int ret; > > > > > + ret = regmap_update_bits(st->map, 0x1, 0x80, > > > + st->level_shifter ? 0x80 : 0); > > > > This is a bit cryptic, what does 1 stand for? > > > Well, I do not find anything in > https://invensense.tdk.com/wp-content/uploads/2015/02/MPU-9150-Register-Map.pdf > I have just found a similar line in the ancient 3.0 vendor kernel. No symbolic > names there.
Okay, perhaps a comment on top to point out this ("the code based on v3.0 vendor kernel, the meaning is unknown").
-- With Best Regards, Andy Shevchenko
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