gpio: gpio-pca953x, Add get_multiple function

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Implement a get_multiple function for gpio-pca953x. If a driver
leaves get_multiple unimplemented then gpio_chip_get_multiple()
in gpiolib.c takes care of it by calling chip->get() as needed.
For i2c chips this is very inefficient. For example if you do an
8-bit read then instead of a single i2c transaction there are
8 transactions reading the same byte!

Signed-off-by: Paul Thomas <pthomas8589@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

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Paul Thomas 2020-04-14 11:28:42 -04:00 • committed by Bartosz Golaszewski

parent ea06a482a4

commit 96d7c7b3e6

1 changed files with 37 additions and 0 deletions

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drivers/gpio/gpio-pca953x.c

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