gpio: pca953x: use regmap_update_bits() to improve performance

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Using regmap_update_bits() allows to reduce the number of I2C transfers
when updating bits that haven't changed on non-volatile registers.

For example on a PCAL6416, when changing a GPIO direction from input to
output, the number of I2C transfers can be reduced from 4 to just 1 if
the pull resistors configuration hasn't changed and the output value
is the same as before.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20250714133730.6353-1-hugo@hugovil.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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Hugo Villeneuve 2025-07-14 09:37:30 -04:00 • committed by Bartosz Golaszewski

parent e70513bd98

commit 2aa8ccab5a

1 changed files with 10 additions and 10 deletions

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drivers/gpio/gpio-pca953x.c

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