gpio: ich: Add output levels cache support

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This patch allows GPIO driver to cache GPIO_LVL output registers. The aim is to
support chipsets on which GPIO_LVL value can't be read for output pins.

Caching output levels implies the first output values reading as 0. The driver
so can't be aware of set values GPIOs by bootloader or BIOS.

Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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Vincent Donnefort 2014-02-07 14:21:06 +01:00 • committed by Linus Walleij

parent b667cf488a

commit ff2ed0491d

1 changed files with 19 additions and 2 deletions

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21

drivers/gpio/gpio-ich.c

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