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pinctrl: mediatek: Supporting driving setting without mapping current to register value

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MediaTek's smartphone project actual usage does need to know current value
(in mA) in procedure of finding the best driving setting.
The steps in the procedure is like as follow:

1. set driving setting field in setting register as 0, measure waveform,
   perform test, and etc.
2. set driving setting field in setting register as 1, measure waveform,
   perform test, and etc.
...
n. set driving setting field in setting register as n-1, measure
   waveform, perform test, and etc.
Check the results of steps 1~n and adopt the setting that get best result.

This procedure does need to know the mapping between current to register
value.
Therefore, setting driving without mapping current is more practical for
MediaTek's smartphone usage.

Signed-off-by: Light Hsieh <light.hsieh@mediatek.com>
Link: https://lore.kernel.org/r/1579675994-7001-2-git-send-email-light.hsieh@mediatek.com
Acked-by: Sean Wang <sean.wang@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Light Hsieh 2020-01-22 14:53:10 +08:00 • committed by Linus Walleij
commit 5f755e1f1e
3 changed files with 19 additions and 2 deletions
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