Re: [PATCH v2 1/8] iio: accel: kx022a: Improve reset delay

[Jonathan Cameron <jic23@kernel.org>]

On Thu, 21 Nov 2024 10:19:50 +0200
Matti Vaittinen <mazziesaccount@gmail.com> wrote:

> All the sensors supported by kx022a driver seemed to require some delay
> after software reset to be operational again. More or less a random
> msleep(1) was added to cause the driver to go to sleep so the sensor has
> time to become operational again.
> 
> Now we have official docuumentation available:
> https://fscdn.rohm.com/kionix/en/document/AN010_KX022ACR-Z_Power-on_Procedure_E.pdf
> https://fscdn.rohm.com/kionix/en/document/TN027-Power-On-Procedure.pdf
> https://fscdn.rohm.com/kionix/en/document/AN011_KX134ACR-LBZ_Power-on_Procedure_E.pdf
> 
> stating the required time is 2 ms.
> 
> Due to the nature of the current msleep implementation, the msleep(1) is
> likely to be sleeping more than 2ms already - but the value "1" is
> misleading in case someone needs to optimize the start time and change
> the msleep to a more accurate delay. Hence it is better for
> "documentation" purposes to use value which actually reflects the
> specified 2ms wait time.
> 
> Change the value of delay after software reset to match the
> specifications and add links to the power-on procedure specifications.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Stands fine on it's own so applied (before I've even read the rest of the series).

Jonathan