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authorLinus Walleij <linus.walleij@linaro.org>2018-10-12 15:54:12 +0300
committerMark Brown <broonie@kernel.org>2018-10-12 19:55:02 +0300
commitb0ce7b29bfcd090ddba476f45a75ec0a797b048a (patch)
treeb689c014f8e3423d4db5a5355ec81c548eba3ae1 /include/linux/gpio
parentbef9391cbec547351c6a13e52f3a26bb2d271ec7 (diff)
downloadlinux-b0ce7b29bfcd090ddba476f45a75ec0a797b048a.tar.xz
regulator/gpio: Allow nonexclusive GPIO access
This allows nonexclusive (simultaneous) access to a single GPIO line for the fixed regulator enable line. This happens when several regulators use the same GPIO for enabling and disabling a regulator, and all need a handle on their GPIO descriptor. This solution with a special flag is not entirely elegant and should ideally be replaced by something more careful as this makes it possible for several consumers to enable/disable the same GPIO line to the left and right without any consistency. The current use inside the regulator core should however be fine as it takes special care to handle this. For the state of the GPIO backend, this is still the lesser evil compared to going back to global GPIO numbers. Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Jon Hunter <jonathanh@nvidia.com> Fixes: efdfeb079cc3 ("regulator: fixed: Convert to use GPIO descriptor only") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/gpio')
-rw-r--r--include/linux/gpio/consumer.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..33695a1d8b35 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -30,6 +30,7 @@ struct gpio_descs {
#define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
#define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
#define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
+#define GPIOD_FLAGS_BIT_NONEXCLUSIVE BIT(4)
/**
* Optional flags that can be passed to one of gpiod_* to configure direction