Re: [PATCH] iio: gyro: mpu3050: fix sign of raw angular velocity readings

[Joshua Crofts <joshua.crofts1@gmail.com>]

On Sun,  2 Aug 2026 13:55:40 +0700
Cong Nguyen <congnt264@gmail.com> wrote:

> The MPU-3050 gyroscope output registers hold 16-bit two's complement
> values; the angular velocity channels are declared with .sign = 's'.
> When mpu3050_read_raw() handles IIO_CHAN_INFO_RAW it reads the register
> via a big-endian regmap_bulk_read() and assigns it with:
> 
> 	*val = be16_to_cpu(raw_val);
> 
> be16_to_cpu() yields an unsigned 16-bit quantity, so negative rates
> (bit 15 set) are reported to userspace as large positive integers
> (e.g. -1 becomes 65535) instead of the correct negative value.
> 
> Cast to s16 before the assignment, matching the temperature channel a
> few lines above which already handles the sign correctly.
> 

LGTM.

Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>

-- 
Kind regards,
Joshua Crofts