On Tue, Mar 30, 2021 at 10:54 AM Linus Walleij [off-list ref] wrote:

The data sheet for CY8CTMA340 specifies that the reset pulse
shall be at least 1 ms. Specify 1-2 ms with usleep_range()
to cut some slack for the scheduler.

Curiously the datasheet does not specify how long we have to
wait after a hard reset until the chip is up, but I have found
a vendor tree (Samsung GT-S7710) that has code for this touch
screen and there this is set to 5 ms so I use this with
the same 1 ms fuzz.

Signed-off-by: Linus Walleij <redacted>
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Makes sense.

Reviewed-by: Javier Martinez Canillas <javier@dowhile0.org>